A New Electron Acceptor with meta-alkoxyphenyl Side Chain for Fullerene-Free Polymer Solar Cells with 9.3% Efficiency
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1 FULL PAPER Polymer Solar Cells A New Electron Acceptor with meta-alkoxyphenyl Side Chain for Fullerene-Free Polymer Solar Cells with 9.3% Efficiency Zhenzhen Zhang, Liuliu Feng, Shutao Xu, Ye Liu, Hongjian Peng, Zhi-Guo Zhang, Yongfang Li, and Yingping Zou* A new small molecule acceptor,, based on indacenodithieno[3,2- b]thiophene core with meta-alkoxyphenyl side chains, is designed and synthesized. The film shows broader and redshift absorption compared to its solution and matched energy levels with a hexafluoroquinoxaline-based polymer donor-hfqx-t. Here, polymer solar cells (PSCs) by blending an HFQx-T donor and an acceptor as an active layer deliver the power conversion efficiency (PCE) of 6.36% without any posttreatment. The investigations demonstrate that the HFQx-T: blend films possess higher and more balanced charge mobility, negligible bimolecular recombination, and nanoscale interpenetrating morphology after thermal annealing (TA) treatment. Through a simple TA treatment at 15 C for 5 min, an impressive PCE of 9.3% is obtained. This efficiency is among one of the highest PCEs for additive free PSCs. This is the first time alkoxyphenyl side chain is introduced into nonfullerene electron acceptor; more interestingly, the new electron acceptor () in this work shows a great potential for highly efficient photovoltaic properties. 1. Introduction Exploitation and utilization of solar energy can not only solve the shortage of fossil fuels, the insecurity of the nuclear energy, and other energy problems, but also can push the development of economy and technology. [1] Solution-processed polymer Z. Z. Zhang, L. L. Feng, S. T. Xu, Y. Liu, Dr. H. J. Peng, Prof. Y. P. Zou College of Chemistry and Chemical Engineering Central South University Changsha 4183, China yingpingzou@csu.edu.cn Dr. Z.-G. Zhang, Prof. Y. F. Li Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy of Sciences Beijing 119, China 217 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. The ORCID identification number(s) for the author(s) of this article can be found under DOI: 1.12/advs solar cells (PSCs) are a promising way for the utility of solar energy, and have been intensively investigated due to their advantages of light weight, low-cost, and flexible devices through roll-to-roll solution processes. [2 5] The PSCs based on conjugated polymers as an electron donor (D) and fullerene derivatives as an acceptor (A) have power conversion efficiencies (PCEs) of over 1%. [6 1] However, the development of fullerene-based PSCs is impeded by the shortcomings of the fullerene derivatives, such as weak absorption in the visible region and limited energy level modulation. In recent two years, considerable efforts have been devoted to develop the nonfullerene acceptors. The organic/ polymer electron acceptors based on perylene diimide (PDI) and naphthalene diimide (NDI) have shown a good performance as a result of the unique flat and rigid conjugated structure and modification. [11 14] Studies on the molecule self-assembly of the traditional PDI and NDI derivatives show that they usually tend to form large crystalline domains [15,16] ; however, twisted PDI and NDI derivatives may decrease electron mobility. [17,18] Therefore, it is still a challenge to design PDI or NDI molecules with high electron mobility and nanoscale aggregated domain simultaneously. [19] The other promising small molecules are based on rigid and coplanar indacenodithiophene (IDT) backbone, which exhibit strong and broad absorption as well as high charge carrier mobility. Moreover, the tetrahexylphenyl groups was attached to IDT, which can reduce intermolecular interactions and avoid strong self-aggregation. [2] Zhan and coworkers reported a novel high-performance acceptor named as IEIC, which is based on indaceno[1,2-b:5,6-b ]dithiophene and 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile(IC). When blended with a low-bandgap donor polymer PTB7- Th, the device showed an efficiency of 6.3%. [21] Compared to IDT, a seven-member fused ring indacenodithieno[3,2-b] thiophene (IDTT) core with extended conjugation length can further improve light-harvesting abilities and enhance charge mobilities. [22] Zhan s group first reported IDTT-based acceptor (ITIC), when blended with PTB7-Th, the device delivered a PCE of 6.8%. [23] Recently, using ITIC as electron acceptor, (1 of 8) 217 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
2 nonfullerene PSCs have reached high performance of 9 12%. [24 29] These promising results have attracted tremendous interests to investigate IEIC and ITIC derivatives as electron acceptors. Among the ITIC derivatives, the side chain engineering of IDT or IDTT had drawn much attention to achieve high efficiencies, because the types of side chains play an important role in the energy level, mobility, morphology, and therefore PCEs. [3,31] For example, IC-C6IDT-IC with four n-hexyl as side chains, exhibited a PCE of 8.71%, [32] and ITIC-Th with four 2-thienyl groups showed a PCE of up to 9.6% with 1-chloronaphthalene additive. [33] However, from the reported ITIC derivatives, no attention was paid to using alkoxyphenyl replacing alkylphenyl of ITIC, indeed, alkoxyphenyl group seemed more easily synthesized via simple etherification, much lower cost, and more coplanar compared to its alkyl counterpart. The unique features of alkoxyphenyl group are beneficial for scalability and commercialization. Moreover, side chain isomerization influences the intermolecular self-assembly of the conjugated structure due to steric effect and then have an impact on the performance of PSCs. It is noticed that metasubstitution of phenyl rings in donor materials has better solubility and good compatibility with PCBM. [34 36] Recently, Li and co-workers have reported an acceptor material m-itic by replacing paraalkylphenyl of ITIC with meta-alkylphenyl; when m-itic was blended with a polymer donor J61 after thermal annealing (TA) at 13 C for 5 min, the PCE achieved was 11.77%. The performance is more superior than that of the J61/ITIC blend, because m-itic with meta-alkylphenyl instead of para-alkylphenyl side chains showed higher film absorption coefficient and higher electron mobility compared to its counterpart- ITIC. [37] Based on the above considerations, we first synthesized a new acceptor, namely,, based on IDTT as a core with four meta-alkoxyphenyl as side chains as well as IC as an end group. The new acceptor possesses the following characteristics: (1) fused and planar ring from IDTT core can enhance absorption and charge transport; (2) four meta-alkoxyphenyl side chains can ensure solubility in common solvents; and (3) IC as an end group leads to deep LUMO energy levels, which is appropriate to be an acceptor material. To obtain high-performance PSCs, the selection of donor materials with complementary absorption, suitable energy levels, and appropriate miscibility with acceptor materials to form nanoscale phase separation and bicontinuous interpenetrating networks is also critical. [38 4] During the exploration of high-performance donor materials, quinoxaline (Qx)-based polymers attracted great attention due to the unique building block with interesting optoelectronic properties and easy modification. [41 43] Very recently, we demonstrated a PCE of 9.12% for nonfullerene PSCs after additive and TA treatments with a tetrafluoroquinoxaline-based polymer donor-pffqx-ps and ITIC as acceptor. [44] Inspired by this successful strategy, most recently, our group synthesized a hexafluoroquinoxaline-based Figure 1. Chemical structures of polymer donor HFQx-T and nonfullerene acceptor. polymer donor (HFQx-T). The chemical structures of HFQx-T and are shown in Figure 1a. Here, we fabricated devices based on HFQx-T donor and acceptor, which exhibited a PCE of 6.36% without any posttreatment. Interestingly, avoiding complicated additive process, only through a simple TA, the devices based on HFQx-T:m-ITIC- OR blended films delivered a high PCE of up to 9.3% due to improved short-circuit current density (J sc ) and fill factor (FF), which is even higher than that of HFQx-T:ITIC based devices. This efficiency is among one value of highest PCEs in additivefree PSCs. The results indicate that meta-alkoxyphenyl side chain is promising for constructing high-performance electron acceptors. Combining its simplicity, low cost, and high performance, shows a great potential for photovoltaic applications. 2. Results and Discussion The detailed synthetic route of is shown in Scheme 1. The synthesis details are provided in the Supporting Information. Compound 3 was prepared by Stille cross-coupling between 2,5-dibromoterephthalic ethyl ester and tributyl(thieno[3,2-b]thiophen-2-yl)stannane using Pd(PPh 3 ) 4 as the catalyst. Compound 4 was obtained by lithiation of 3-(octyloxy)-1-bromobenzene and followed by reacting with compound 3, and then the crude product was refluxed in a mixture of acetic acid and concentrated hydrochloric acid for 4 h. Compound 4 was lithiated and then quenched with N,N- Dimethylformamide (DMF) to obtain compound 5. Subsequent Knoevenagel condensation between compound 5 and 2-(3-oxo- 2,3-dihydroinden-1-ylidene)-malononitrile (IC) afforded with 52% yield. All intermediates were characterized by 1 H NMR, and the target product was characterized by NMR and elemental analysis. NMR spectra of the were shown in Figures S1 and S2 (Supporting Information). shows good solubility in common solvents, such as chloroform (CF) and chlorobenzene (CB). The UV vis absorption spectra of pure are shown in Figure 2a. The film exhibited broader absorption with a significant redshift of 36 nm compared to its solution state. The absorption maximum (λ max ) of (2 of 8) 217 The Authors. 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3 Scheme 1. Synthetic route of. film was at 69 nm with a maximum absorption coefficient of cm 1. had absorption edge (λ edge ) of 75 nm and the corresponding optical bandgap (E g opt = 124/λ edge ) was 1.65 ev. As shown in Figure 2b, the λ max and λ edge of HFQx-T were located at 64 and 75 nm, respectively. The HFQx-T and blend films before and after TA both provided a complementary absorption, covering a wide absorption range from 5 to 75 nm. The electrochemical properties of HFQx-T and m-itic- OR were measured by cyclic voltammetry (CV) with the ferrocene/ferrocenium (Fc/Fc + ) redox couple (4.8 ev below the vacuum level) as an internal reference. As shown in Figure 2c, the HOMO energy levels (E HOMO ) and LUMO energy levels (E LUMO ) of were estimated to be 5.65 and 3.97 ev from the onset oxidation and reduction potentials. The bandgap of estimated from the CV was 1.68 ev, which was consistent with the optical bandgap. The E HOMO and E LUMO of HFQx-T donor were also measured to be 5.45 and 3.5 ev, respectively (Figure S3, Supporting Information). The energy diagram relative to the vacuum level is shown in Figure 2d and the optical together with electrochemical data of are summarized in Table 1. Notably, the LUMO energy offset (ΔE LUMO ) between HFQx-T and m-itic- OR is.47 ev, which is sufficient for the exciton dissociation of the donor HFQx-T and the electron transfer from HFQx-T to. Despite HOMO energy offset (ΔE HOMO ) is only.2 ev, the hole transfer from the acceptor to the HFQx-T donor appeared to be relatively efficient, as can be seen from the photo luminescence (PL) quenching measurement. The PL spectra of the HFQx-T (excited at 6 nm) and (excited at 69 nm) films as well as the blend films of HFQx-T: (1:1, w/w) (excited at 6 and 9 nm) are shown in Figure 2e,f, the excitation wavelength was selected according to their maximum absorption. The pure HFQx-T film exhibited a broad PL emission in the range of nm, however, the PL emissions were quenched by 92% in the HFQx-T: blend films, which indicated efficient electron transfer from HFQx-T to. The PL intensities of were also significantly quenched (95%) by HFQx-T in the HFQx-T: blend films. The results provide clear evidence that efficient exciton separation and hole transfer can take place under low energy offset for nonfullerene PSCs. This efficient charge transfer is beneficial to obtaining a high J sc in PSCs. Based on the above analysis, the HFQx-T: is expected to possess good photovoltaic performance. It has no prominent quenching efficient before and after TA treatment and even has stronger PL intensity with TA treatment in some wavelength range. The results indicate that TA treatment has little effect on charge transfer at the HFQx-T and interface. Although TA treatment is unfavorable for charge transfer, TA can induce microphase separation and form highly ordered interpenetrating networks as described below, which leads to an increase of J sc and FF. [45] To investigate photovoltaic applications of HFQx- T: blend films in PSCs, we fabricated PSCs with conventional structure of indium tin oxide (ITO)/poly(3,4-eth ylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)/ active layer/pdi functionalized with amino N-oxide (PDINO)/Al, where PEDOT:PSS and PDINO were hole and (3 of 8) 217 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
4 (a) Normalized absorption Absorbance (15cm-1 ) in film in solution (b) Normalized absorption HFQx-T blend (1:1, w/w) blend (1:1, w/w) with TA (c) Current (ma).5 ma Fc/Fc + (d) LUMO ITO -4.7 PSS: PEDOT HFQx-T PDINO Al -4.3 (e) PL intensity (a.u.) Potential (V vs Ag/AgCl) HFQx-T with TA PL intensity (a.u.) nm with TA (f) PL intensity (a.u.) HOMO nm PL intensity (a.u.) with TA nm with TA Figure 2. a) Solution and film absorption spectra of ; the inset shows the absorption coefficient of in film state. b) Normalized absorption spectra of HFQx-T,, and HFQx-T: (1:1, w/w) blend films. c) Cyclic voltammograms of in CH 3 CN/.1M Bu 4 NPF 6. d) Energy diagram relative to the vacuum level. e) PL spectra of pure HFQx-T and HFQx-T: (1:1, w/w) blend films (excited at 6 nm); inset shows the PL spectra of blend films with and without TA (excited at 6 nm). f) PL spectra of pure and HFQx-T: (1:1, w/w) blend films (excited at 69 nm); inset shows the PL spectra of blend films with and without TA (excited at 69 nm). electron transport layer, respectively. [46] The HFQx-T:m-ITIC- OR weight ratio and annealing temperatures were well optimized. The detailed photo voltaic data are summarized in Table S1 (Supporting Information). The current-voltage (J V) curves of the optimized HFQx-T: weight ratio (1:1, w/w) under the illumination of AM 1.5G, 1 mw cm (4 of 8) 217 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
5 Table 1. Optical and electrochemical data of. λ max λ edge E g opt α E HOMO E LUMO E g cv Acceptor [nm] a) [nm] b) [ev] c) [cm 1 ] d) [ev] [ev] [ev] e) a) Absorption maximum of thin film; b) Absorption edge of thin film; c) Optical opt band gap calculated from the absorption edge of thin film: E g = 124/λ edge ; d) Absorption coefficient of films; e) Electrochemical bandgap obtained from E LUMO to E HOMO. Table 2. The photovoltaic characteristics of the HFQx-T: blend films. Active layer Ratio V oc [V] J sc [ma cm 2 ] FF [%] PCE [%] Average PCE [%] c) HFQx-T: 1:1 a) :1 b) a) Without annealing; b) Annealing at 15 C for 5 min; c) Average PCEs from ten devices. are shown in Figure 3a and corresponding photovoltaic parameters are listed in Table 2. The PSCs based on HFQx- T: blend films showed a PCE of 6.36% with a V oc of.95 V, a J sc of ma cm 2, and a FF of.5. With 1:1 D/A weight ratio, the PCE was further improved to 9.3% with a V oc of.9 V, a higher J sc of ma cm 2, and a FF of.64 by TA treatment at 15 C for 5 min, which is (a) (b) Current Density (ma/cm 2 ) EQE(%) with TA Voltage (V) withta Wavelength(nm) Figure 3. a) J V curves of the PSCs based on HFQx-T: (1:1, w/w) with and without TA, under illumination of AM 1.5, 1 mw cm 2. b) EQE spectra of PSCs based on HFQx-T: (1:1, w/w) with and without TA. higher than 9.7% efficiency of HFQx-T:ITIC based devices under optimized conditions. The results indicated that TA is an efficient posttreatment in HFQx-T: blend films and has great prospect for photovoltaic applications. The corresponding external quantum efficiency (EQE) spectra of the devices with or without TA are shown in Figure 3b. The devices based on HFQx-T: blend films displayed a broad photo-response from 3 to 8 nm. Obviously, the maximum EQE peak reached 76% after TA, while the maximum value was only 66% without TA, which indicated that the photo-electron conversion efficiency of the HFQx-T: blend films via TA treatment was higher than that of blend films without TA. This may be the reason for higher J sc after TA. J sc values of the devices calculated from integration of the EQE spectra were (TA) and (without TA), in good agreement with the values from the J V curves (within 5% mismatch), which suggested the results were reliable. To further understand the TA effects on the device performance, the charge transport properties of the HFQx- T: blends were investigated using space-chargelimited current (SCLC) method, and the results are shown in Figure 4a,b, and the related data are summarized in Table 3. The hole-only and electron-only devices were measured with devices structure of ITO/PEDOT:PSS/active layer/ Au and ITO/ZnO/active layer/al, respectively. The blend films showed a hole mobility of cm 2 V 1 s 1 and an electron mobility of cm 2 V 1 s 1 with balanced charge transport (µ e /µ h = 1.53). After TA treatment, a hole mobility of cm 2 V 1 s 1 and an electron mobility of cm 2 V 1 s 1 were obtained. Apparently, after TA, charge mobility were greatly increased and exhibited a more balanced charge transport (µ h /µ e = 1.4), which probably TA can induce microphase separation and highly ordered interpenetrating networks. The improved J sc and FF with TA could be attributed from the higher and more balanced charge carrier mobilities in the HFQx-T: blend films. [47,48] Besides the high and balanced carrier mobility, the other factor of affecting photovoltaic performance is charge recombination behavior in the device. Light intensity (P)-dependent photocurrent measurements were carried out to gain insight into the charge recombination behavior in the devices. Generally, the correlation of J sc and P can be described as J sc P α. If the bimolecular recombination of the free carriers is negligible, the power-law exponent (α) should be equal to 1. [49,5] As shown in Figure 4c, the values of α for HFQx-T: blend films without TA was.94, which indicated there was still some (5 of 8) 217 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
6 (a) 12 1 (1:1) (1:1) with TA Table 3. The mobilities data and power-law exponent of PSCs based on HFQx-T: blend films. Active layer Ratio µ h [cm 2 V 1 s 1 ] µ e [cm 2 V 1 s 1 ] µ e /µ h α c) J 1/2 /A 1/2 m -1 (b) (c) J 1/2 /A 1/2 m -1 Jsc (ma cm -2 ) V(V) (1:1) (1:1) with TA hole mobility electron mobility V(V) (α=.94) with TA(α=.98) 1 Light intensity (mw cm -2 ) 1 Figure 4. a) The hole mobilities of the HFOx-T: with or without TA. b) The electron mobilities of the HFOx-T: with or without TA. c) Light intensity dependence of J sc of the PSCs. HFQx-T: 1:1 a) bimolecular recombination. However, the α increased to.98 after TA, which suggested efficient charge transport and weaker biomolecular recombination. The suppressed charge recombination agrees well with the higher FF of.64 and higher J sc of ma cm 2. Tapping-mode atomic force microscopy (AFM) was used to investigate the surface morphology of the optimized photoactive layer as shown in Figure 5a,c, the surface of HFQx- T: at (1:1, w/w) blend film were relatively rough with a root-mean-square (RMS) roughness of 4.37 and 4.12 nm without and with TA, respectively. There is only slight change of RMS roughness with or without TA. Furthermore, we investigated the internal morphology of HFQx-T:m-ITIC- OR blend films by transmission electron microscopy (TEM). As shown in Figure 5b, without TA, little large phase separation and amorphous regions in the HFQx-T: blend films could be observed. In contrast, very homogeneous and interpenetrating networks with small crystalline grains uniformly covering the entire scan area can be seen only after TA (Figure 5d). Large crystalline domains is easy to get recombination for photogenerated excitons before reaching the interfaces of the donor and acceptor, which is harmful for J sc and FF. [51] The results indicated that changes of the interior morphology after TA treatment could be favorable for efficient exciton dissociations in the device, thus giving rise to an increased J sc and FF. [51,52] 3. Conclusion 1:1 b) a) Without annealing; b) Annealing at 15 C for 5 min; c) Power-law exponent. A promising electron acceptor with meta-alkoxyphenyl side chains was first designed and synthesized, showing broad absorption and matched energy levels with HFQx-T. The optimized HFQx-T: blend films possess complementary absorption, high and balanced charge transport, as well as nanoscale interpenetrating morphology, which contributed to high performance in PSCs. Particularly, after TA, µ e /µ h reached a very balanced value of 1.4, which is beneficial for high FF and J sc. The nonfullerene PSCs based on HFQx- T: (1:1, w/w) blend films exhibited an impressive PCE of 9.3% with a V oc of.9 V, a J sc of 16.7 ma cm 2, and a FF of.64 only after TA. This efficiency is among one of the highest PCEs in additive-free PSCs. Our preliminary investigations demonstrate that meta-alkoxyphenyl side chains are very promising for constructing high-performance acceptor materials. This is a new electron acceptor with meta-alkoxyphenyl side chains with an efficiency of over 9%. Despite high PCEs from HFQx-T: blend films in this work, we strongly believe that there is still much space to further improve (6 of 8) 217 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
7 Figure 5. Tapping-mode AFM images of HFQx-T: (1:1, w/w) blend films a) without TA and c) with TA; the insets show corresponding AFM phase images. TEM image of the HFQx-T: (1:1, w/w) blend films b) without TA and d) with TA. photovoltaic performance by material modification and device engineering. Supporting Information Supporting Information is available from the Wiley Online Library or from the author. Keywords hexafluoroquinoxaline-based polymers,, meta-alkoxyphenyl side chains, nonfullerene polymer solar cells Received: April 3, 217 Revised: April 27, 217 Published online: August 17, 217 Acknowledgements Z.Z.Z. and L.L.F. equally contributed to this work. This work was financially supported by the National Natural Science Foundation of China ( , ), Distinguished Young Scientists of Hunan Province, Project of Innovation-driven Plan in Central South University, China (216CX35, 215CXS36), and State Key Laboratory of Powder Metallurgy, Central South University, China. Conflict of Interest The authors declare no conflict of interest (7 of 8) [1] C. Zhan, X. Zhang, J. Yao, RSC Adv. 215, 5, 932. [2] N. S. Sariciftci, L. Smilowitz, A. J. Heeger, F. Wudl, Science 1992, 258, [3] Y. Liang, L. Yu, Polym. Rev. 21, 5, 454. [4] Y. Li, Y. Zou, Adv. Mater. 28, 2, [5] G. Li, R. Zhu, Y. Yang, Nat. Photonics 212, 6, 153. [6] M. Li, K. Gao, X. Wan, Q. Zhang, B. Kan, R. Xia, F. Liu, X. Yang, H. Feng, W. Ni, Y. Wang, J. Peng, H. Zhang, Z. Liang, H.-L. Yip, X. Peng, Y. Cao, Y. Chen, Nat. Photonics 216, 11, 85. [7] J. You, L. Dou, K. Yoshimura, T. Kato, K. Ohya, T. Moriarty, K. Emery, C. C. Chen, J. Gao, G. Li, Y. Yang, Nat. Commun. 213, 4, The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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