综合研究DPE添加剂对含5,6-二氟-苯并[1,2,5]噻二唑给-受体共聚物的光伏性能影响

doi:10.6023/A17020074

化学学报 ›› 2017, Vol. 75 ›› Issue (5): 464-472.DOI: 10.6023/A17020074 上一篇下一篇

研究论文

综合研究DPE添加剂对含5,6-二氟-苯并[1,2,5]噻二唑给-受体共聚物的光伏性能影响

竹芯^a, 朱凯^b, 孙邦锦^a, 樊健^a, 周祎^b, 宋波^b

a. 江苏省碳基功能材料与器件重点实验室苏州大学功能纳米与软物质研究院苏州纳米科技协同创新中心苏州 215123;
b. 苏州大学材料与化学化工学部苏州 215123

投稿日期:2017-02-23 发布日期:2017-04-12
通讯作者: 樊健,宋波 E-mail:jianfan@suda.edu.cn;songbo@suda.edu.cn
基金资助:
项目由国家自然科学基金（Nos.21472135，51303118，51673139，91333204）、江苏省自然科学基金（BK20151216，BK20161211）、苏州纳米科技协同创新中心（CIC-Nano）、江苏省高校优势学科建设工程（PAPD）、新型功能高分子材料国家地方联合工程实验室共同资助.

Comprehensive Study of the Effect of DPE Additive on Photovoltaic Performance of 5,6-Difluoro-benzo[1,2,5]thiadiazole Based Donor-acceptor Copolymers

Zhu Xin^a, Zhu Kai^b, Sun Bangjin^a, Fan Jian^a, Zhou Yi^b, Song Bo^b

a. Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, Jiangsu 215123, China;
b. College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China

Received:2017-02-23 Published:2017-04-12
Contact: 10.6023/A17020074 E-mail:jianfan@suda.edu.cn;songbo@suda.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (21472135, 51303118, 51673139, 91333204), the Natural Science Foundation of Jiangsu Province of China (BK20151216, BK20161211), the Collaborative Innovation Center of Suzhou Nano Science and Technology (CIC-Nano), Soochow University, the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and the State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials.

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1. 综合研究DPE添加剂对含5,6-二氟-苯并[1,2,5]噻二唑给-受体共聚物的光伏性能影响.PDF(1634KB)

摘要/Abstract

合成了三个以5，6-二氟-苯并[1，2，5]噻二唑为受体，2，5-双-（2-辛基-十二烷氧基）-1，4-双（噻吩并[3，2-b]噻吩基）苯和2，5-双-（2-辛基-十二烷氧基）-1，4-双（硒吩基）苯为给体的给-受体型共聚物（PBT2F-TT-a，PBT2F-TT和PBT2F-Se）.这三个聚合物与PC₇₁BM共混制备成了本体异质结聚合物太阳能电池.通过原子力显微镜（AFM）、透射电子显微镜（TEM）、交流阻抗谱（ACIS）、空间电荷限制电流（SCLC）和短路电流密度-入射光光强（J_SC-P_light）测试方法系统研究了二苯醚（DPE）对活性层的形貌、载流子迁移率以及光伏性能的影响.实验结果表明DPE有助于提高共混膜载流子的迁移率，同时器件的光伏性能也得到改善.此外，PBT2F-Se器件的SCLC实验数据揭示了平衡的空穴和电子迁移率有利于提高器件的短路电流密度.

关键词: 聚合物太阳能电池, 二苯醚, 含氟受体, 链内相互作用, 平衡的载流子传输

Three donor-acceptor polymers PBT2F-TT-a, PBT2F-TT and PBT2F-Se were synthesized via Stille cross-coupling reaction with 5,6-difluoro-benzo[1,2,5]thiadiazole as the acceptor, and 2,5-bis-(2-octyl-dodecyloxy)-1,4- di(thieno[3,2-b]thiophen-2-yl)-benzene and 2,5-bis-(2-octyl-dodecyloxy)-1,4-di(selenophen-2-yl)-benzene as the donors. The conjugated backbones of these polymers were decorated with alkoxyl groups to achieve the chain planarity through S…O and Se…O intramolecular interactions. Furthermore, the intramolecular F…H interaction was helpful to minimize the torsional angles. These three polymers were characterized by UV-vis absorption spectroscopy, thermal gravimetric analysis, cyclic voltammetry, gel permeation chromatography and elemental analysis. All the polymers showed intense absorption in the visible range and demonstrated suitable E_LUMO and E_HOMO, which match well with the fullerene-based acceptor. Thus these three polymers were applied as donors and incorporated with PC₇₁BM as active materials in bulk heterojunction polymer solar cells (PSCs). Polymers PBT2F-TT-a and PBT2F-TT are constructed with the same monomers and the latter has a high molecular weight. A notable enhancement in PCE from 3.48% to 4.22% was observed as the molecular weight was increased from 6.79 kDa (PBT2F-TT-a) to 10.36 kDa (PBT2F-TT). The effect of diphenyl ether (DPE) additive on photovoltaic performance of PSCs based on these polymers has been comprehensively investigated by means of atomic force microscopy (AFM), transmission electron microscopy (TEM), alternating current impedance spectrometry (ACIS), space-charge-limited current (SCLC) analysis and short circuit current density - light intensity (J_SC-P_light) measurement. As revealed by AFM and TEM measurement, PBT2F-Se:PC₇₁BM blend with DPE exhibited a nanoscale phase separation dominated with fibrillar structures. On the other hand, the charge carrier mobilities of these blend films were greatly increased after the addition of DPE, giving rise to enhanced photovoltaic performances. Furthermore, the dramatic increase in J_SC of PBT2F-Se-based devices should also benefit from the well-balanced hole and electron mobilities as revealed by SCLC results. Interestingly, J_SC-P_light measurement suggested the weak bimolecular recombination for these devices without and with the addition of DPE. PSCs based on PBT2F-TT-a, PBT2F-TT, and PBT2F-Se showed good power conversion efficiency. Particularly, PBT2F-Se: PC₇₁BM blend with DPE exhibited a good device performance with J_SC of 10.75 mA/cm², V_OC of 0.72 V and PCE of 4.18%.

Key words: polymer solar cells, diphenyl ether, fluorinated acceptor, intra-chain interaction, balanced charge transportation

引用此文

竹芯, 朱凯, 孙邦锦, 樊健, 周祎, 宋波. 综合研究DPE添加剂对含5,6-二氟-苯并[1,2,5]噻二唑给-受体共聚物的光伏性能影响[J]. 化学学报, 2017, 75(5): 464-472.

Zhu Xin, Zhu Kai, Sun Bangjin, Fan Jian, Zhou Yi, Song Bo. Comprehensive Study of the Effect of DPE Additive on Photovoltaic Performance of 5,6-Difluoro-benzo[1,2,5]thiadiazole Based Donor-acceptor Copolymers[J]. Acta Chim. Sinica, 2017, 75(5): 464-472.

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综合研究DPE添加剂对含5,6-二氟-苯并[1,2,5]噻二唑给-受体共聚物的光伏性能影响

Comprehensive Study of the Effect of DPE Additive on Photovoltaic Performance of 5,6-Difluoro-benzo[1,2,5]thiadiazole Based Donor-acceptor Copolymers

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