Wide bandgap conjugated polymers based on bithiophene and benzotriazole for bulk heterojunction solar cells: Thiophene versus thieno[3,2-b]thiophene as p-conjugated spacers
Wide bandgap conjugated polymers based on bithiophene and benzotriazole for bulk heterojunction solar cells: Thiophene versus thieno[3,2-b]thiophene as p-conjugated spacers
复制标题
用于本体异质结太阳能电池的基于联噻吩和苯并三唑的宽带隙共轭聚合物：噻吩与噻吩并[3,2-b]噻吩作为p-共轭间隔物
DOI：
10.1080/10601325.2017.1309250
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Yangjun Xia
中科院分区：
文献类型：
--
作者：
Zejuan Huo;Peng Zhang;Jianfeng Li;Junfeng Tong;Chunyan Yang;Wei Dou;Yangjun Xia
以噻吩并[3，2-B]噻吩（TT）和噻吩（T）为π桥，设计并合成了两种具有给体-π-受体（D-π-A）结构的宽带隙（WBG）共轭聚合物P2 T-DTTTAZ和P2 T-DTTAZ。并且，观察到P2 T-DTTAZ的约1.98 eV和P2 T-DTTAZ的约2.09 eV的较宽的光学带隙（Eg）。与P2 T-DTTAZ相比，P2 T-DTTTAZ以较大的共轭平面TT单元作为π桥取代T单元，吸收峰红移，禁带宽度减小。以P2 T-DTTAZ或P2 T-DTTAZ为给体，[6，6]苯基-C61丁酸甲酯（PC61 BM）为受体，组装了具有倒置器件结构的聚合物太阳能电池，并对其光伏性能进行了研究。P2 T-DTTAZ和P2 T-DTTAZ的功率转换效率分别为1.57%和1.25%。
Two wide bandgap (WBG) conjugated polymers, P2T-DTTTAZ and P2T-DTTAZ, with donor-π-acceptor (D-π-A) structures was designed and synthesized, utilizing thieno[3,2-b]thiophene (TT) and/or thiophene (T) units as π-bridge in conjugated polymer backbone. And, the wider optical band gap (Eg) of approximately 1.98 eV for P2T-DTTTAZ and 2.09 eV for P2T-DTTAZ were observed. Obviously, replacing T unit with larger conjugated plane TT unit as π-bridges, P2T-DTTTAZ resulted in the red shifted absorption and the reduced band gap, compared with these of P2T-DTTAZ. The polymer solar cells (PSCs) with an inverted device structure based on P2T-DTTTAZ or P2T-DTTAZ as donor and [6,6] phenyl-C61butyric acid methyl ester (PC61BM) as acceptor were assembled and the photovoltaic properties were also investigated. The power conversion efficiencies (PCEs) of 1.57% for P2T-DTTTAZ and 1.25% for P2T-DTTAZ were obtained.