Synthesis and photovoltaic properties of new donor–acceptor (D–A) copolymers based on benzo[1,2-b:3,4-b′:6,5-b′′] trithiophene donor and different acceptor units (P1 and P2)
Synthesis and photovoltaic properties of new donor–acceptor (D–A) copolymers based on benzo[1,2-b:3,4-b′:6,5-b′′] trithiophene donor and different acceptor units (P1 and P2)
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DOI：
10.1039/c4ra05680a
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发表时间：
2014-10
期刊：
影响因子：
3.9
通讯作者：
M. L. Keshtov;Youquan Deng;Z. Xie;Y. Geng;S. A. Kuklin;V. Kochurov;A. Khokhlov;E. Koukaras;G. Sharma
中科院分区：
文献类型：
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作者：
M. L. Keshtov;Youquan Deng;Z. Xie;Y. Geng;S. A. Kuklin;V. Kochurov;A. Khokhlov;E. Koukaras;G. Sharma
两个新的共轭D-A共聚物P1（PBTT-TQ）和P2（PBTT-TPz）基于相同的苯并[1，2-B：3，4-B′：6，5-B′]三噻吩（BTT）供体和不同受体单体4，9-双（5-溴噻吩-2-基）-6，7-双（2-乙基己基）[1，2，5]噻二唑并[3，4-g]喹喔啉（TQ）和5，7-双（5-溴噻吩-2-基）-2，3-双（5-辛基噻吩-2-基）噻吩并[3，4-B]吡嗪采用Stille交叉偶联法合成了TPy，并通过凝胶渗透色谱（GPC）、1H NMR、紫外-可见吸收光谱、热分析和电化学循环伏安（CV）测试对其进行了表征。从这些共聚物在薄膜中的光吸收开始测量的P1和P2的光学带隙分别为1.14 eV和1.38 eV。以P1和P2为施主，PC61 BM或PC 71 BM为受主，聚合物与PC61 BM的重量比分别为1：1、1：2和1：3，研究了体异质结（BHJ）器件的光伏特性。由邻二氯苯（o-DCB）浇铸的P1：PC 71 BM（1：2）和P2：PC 71 BM（1：2）的活性共混层制造的优化光伏器件分别显示出2.05%和3.14%的PCE，而P2：PC61 BM和P2：PC 71 BM分别产生1.44%和2.11%的PCE。以1-氯萘（CN）/o-DCB为溶剂制备的P1：PC 71 BM和P2：PC 71 BM的BHJ太阳能电池的PCE进一步提高，分别达到5.28%和2.6%。
Two new conjugated D–A copolymers P1 (PBTT-TQ) and P2 (PBTT-TPz) based on the same benzo[1,2-b:3,4-b′:6,5-b′′] trithiophene (BTT) donor and different acceptor monomers 4,9-bis(5-bromithiophen-2-yl)-6,7-bis(2-ethylhexyl)[1,2,5] thiadiazolo[3,4-g] quinoxaline (TQ) and 5,7-bis(5-bromothiophen-2-yl)-2,3-bis(5-octylthiophen-2-yl) thieno[3,4-b] pyrazine (TPy), respectively, were synthesized by Stille cross-coupling reaction and characterized by gel permeation chromatography (GPC), 1H NMR, UV-Vis absorption, thermal analysis and electrochemical cyclic voltammetry (CV) tests. The optical bandgaps of P1 and P2 measured from the onset of optical absorption of these copolymers in thin films were 1.14 eV and 1.38 eV, respectively. Photovoltaic properties of the bulk heterojunction (BHJ) devices were studied using P1 and P2 as the donor and PC61BM or PC71BM as the acceptor with weight ratios of polymer : PC61BM of 1 : 1, 1 : 2 and 1 : 3. The optimized photovoltaic devices fabricated with active blend layers of P1:PC71BM (1 : 2) and P2:PC71BM (1 : 2) cast from o-diclorobenzene (o-DCB) showed PCEs of 2.05% and 3.14%, respectively, whereas P2:PC61BM and P2:PC71BM yielded PCEs of 1.44% and 2.11%, respectively. The PCEs of BHJ solar cells based on P1:PC71BM and P2:PC71BM processed from 1-chloronapthanene (CN)/o-DCB solvent were further improved up to 5.28% and 2.6%, respectively.