Development of s-tetrazine-based polymers for efficient polymer solar cells by controlling appropriate molecular aggregation
摘要:
Two conjugated polymers PTTTz and PHTTz have been designed and synthesized by introducing s-tetrazine as electron-withdrawing moieties. Compared with PTTTz with 2-octyldodecyl-substituted tetrathiophene derivative as electron-donating moieties, PHTTz with hexyl- and 2-octyldodecyl-substituted hexathiophene derivative possesses relatively lower molecular coplanarity, larger stacking distance but more orderly molecular stacking, more red-shifted absorption, more suitable microphase separation, more efficient exciton dissociation, higher hole mobility, which lead to higher short-circuit current density (11.54 mA cm(-2)), fill factor (69.0%) and power conversion efficiency (PCE = 6.69%) values in PSCs. The PITTz-based PSC shows an open circuit voltage of 1.02 V for its lower-ling HOMO energy level though the PCE of the PSC is only 5.16%. Moreover, the ternary PSC based PHITz/PC71BM/ITIC exhibits a higher PCE value of 7.88% than the binary PSCs for more efficient exciton dissociation and complementary absorption spectrum in ternary blend film, which is one of the highest PCE values in s-tetrazine-based polymers.
作为新兴的缺乏电子的新组成部分,s-四嗪(Tz)具有很高的电子亲和力,甚至比常用的苯并噻二唑单元还要高。这种特性使Tz成为低带隙共轭聚合物,特别是有机太阳能电池材料非常有希望的吸电子单元。我们报告的合成和性质的五个交替共聚物的s-四嗪和环戊[2,1-b:3,4-b']二噻吩(CPDT),这是一个噻吩单元桥接。将甲基,己基和/或2-乙基己基引入到噻吩和CPDT单元上,以调节所得聚合物的溶解度,紫外线吸收,前沿分子轨道能级和链间堆积特性。这些聚合物可在高达220°C的温度下保持稳定,并在较高的温度下分解为Tz键,从而分解为二腈化合物。71-丁酸甲基酯(PC 71 BM),在模拟的1.5 m AM / 100 GW / cm 2的AM辐照下,它们的功率转换效率高达5.53%。然后通过原子力显微镜(AFM)分析来自不同聚合物或在不同加工条件下的活性层的形态结构,并将其与器件性能相关联。
TETRAZINE MONOMERS AND COPOLYMERS FOR USE IN ORGANIC ELECTRONIC DEVICES
申请人:DING Jianfu
公开号:US20120007026A1
公开(公告)日:2012-01-12
Copolymers of formula (I):
where each A is S, Se or C═C; each x is an integer from 1 to 4; each R1 is independently H, F, CN or a C
1
-C
20
linear or branched aliphatic group; Ar is one or more substituted or unsubstituted aromatic units; and, n is an integer 5 or greater, can be formed into films or membranes that are useful as active layers in organic electronic device, such as PV solar cells, providing high power conversion efficiencies and good thermal stability. Such copolymers may be synthesized from monomers of formula (II):
by Stille or Suzuki coupling reactions. Such monomers may be synthesized by a variation of the Pinner synthesis.
Development of a New s-Tetrazine-Based Copolymer for Efficient Solar Cells
作者:Zhao Li、Jianfu Ding、Naiheng Song、Jianping Lu、Ye Tao
DOI:10.1021/ja106052e
日期:2010.9.29
A new s-tetrazine-based low-bandgap semiconducting polymer, PCPDTTTz, was designed and synthesized. This is the first solution-processable conjugated polymer with tetrazine in the main chain. This polymer shows good thermal stability and broad absorption covering 450-700 nm. The HOMO and LUMO energy levels were estimated to be -5.34 and -3.48 eV, with an electrochemical bandgap of 1.86 eV. Simple polymer solar cells based on PCPDTTTz and PC71BM exhibit a calibrated power conversion efficiency of 5.4%.
Donor–acceptor copolymers incorporating polybenzo[1,2-b:4,5-b′]dithiophene and tetrazine for high open circuit voltage polymer solar cells
Two new low band gap conjugated polymers containing a benzo[1,2-b: 4,5-b'] dithiophene donor unit and a tetrazine acceptor unit were synthesized by Stille cross-coupling polymerization. The structural and thermal properties of copolymers were characterized using nuclear magnetic resonance, gel permeation chromatography and thermogravimetric analysis. The results show that the donor-acceptor copolymers thus developed have good thermal stability with decomposition temperature of 294 degrees C and 305 degrees C. Cyclic voltammetric study revealed that the copolymers possess a deep-lying highest occupied molecular orbital energy level, which is desired for high open circuit voltage polymer solar cells (PSCs) and is also favorable for stable device operation in air. Bulk-heterojunction PSCs based on blend of low band gap copolymers: [6,6]-phenyl-C71-butyric acid methyl ester on indium tin oxide/glass substrates were fabricated. This work yielded a promising power conversion efficiency of >5.0%, with a high open circuit voltage of similar to 1.0 V, measured under air mass 1.5 global irradiation of 100 mW/cm(2). Crown Copyright (C) 2013 Published by Elsevier B.V. All rights reserved.
US8673183B2
申请人:——
公开号:US8673183B2
公开(公告)日:2014-03-18
Alternating Copolymers of Dithienyl-s-Tetrazine and Cyclopentadithiophene for Organic Photovoltaic Applications
作者:Zhao Li、Jianfu Ding、Naiheng Song、Xiaomei Du、Jiayun Zhou、Jianping Lu、Ye Tao
DOI:10.1021/cm200330c
日期:2011.4.12
frontier molecular orbital energy levels, and interchain stacking property of the resulting polymers. These polymers are stable up to 220 °C and decompose to dinitrile compounds with the breaking of Tz linkage at a higher temperature. Efficient bulkheterojunctionsolarcells were fabricated by blending these polymers with (6,6)-phenyl-C71-butyric acid methyl ester (PC71BM), and they reached a power conversion
作为新兴的缺乏电子的新组成部分,s-四嗪(Tz)具有很高的电子亲和力,甚至比常用的苯并噻二唑单元还要高。这种特性使Tz成为低带隙共轭聚合物,特别是有机太阳能电池材料非常有希望的吸电子单元。我们报告的合成和性质的五个交替共聚物的s-四嗪和环戊[2,1-b:3,4-b']二噻吩(CPDT),这是一个噻吩单元桥接。将甲基,己基和/或2-乙基己基引入到噻吩和CPDT单元上,以调节所得聚合物的溶解度,紫外线吸收,前沿分子轨道能级和链间堆积特性。这些聚合物可在高达220°C的温度下保持稳定,并在较高的温度下分解为Tz键,从而分解为二腈化合物。71-丁酸甲基酯(PC 71 BM),在模拟的1.5 m AM / 100 GW / cm 2的AM辐照下,它们的功率转换效率高达5.53%。然后通过原子力显微镜(AFM)分析来自不同聚合物或在不同加工条件下的活性层的形态结构,并将其与器件性能相关联。