Conventional and Inverted Photovoltaic Cells Fabricated Using New Conjugated Polymer Comprising Fluorinated Benzotriazole and Benzodithiophene Derivative

Bulletin of the Korean chemical society

Yongfang Li¹  Ji-Hoon Kim¹  Zhi-Guo Zhang¹  In-Nam Kang¹  Do-Hoon Hwang¹  Won Suk Shin¹  Chang Eun Song¹ 

关键词: Fluorine-substituted benzotriazole;    Medium band gap semiconducting polymer;    Organic photovoltaic cell;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

A new conjugated copolymer, poly{4,8-bis(triisopropylsilylethynyl)benzo[1,2-b:4,5-b′]dithiophene-alt-4,7- bis(5-thiophen-2-yl)-5,6-difluoro-2-(heptadecan-9-yl)-2H-benzo[d][1,2,3]triazole} (PTIPSBDT–DFDTBTz), is synthesized by Stille coupling polycondensation. The synthesized polymer has a band gap energy of 1.9 eV, and it absorbs light in the range 300–610 nm. The hole mobility of a solution-processed organic thin-film transistor fabricated using PTIPSBDT–DFDTBTz is 3.8 × 10−3 cm2 V−1 s−1. Bulk heterojunction photovoltaic cells are fabricated, with a conventional device structure of ITO/PEDOT:PSS/polymer:PC71BM/Ca/Al (PC71BM = [6,6]-phenyl-C71-butyric acid methyl ester); the device shows a power conversion efficiency (PCE) of 2.86% with an open-circuit voltage (Voc) of 0.85 V, a short-circuit current density (Jsc) of 7.60 mA cm−2, and a fill factor (FF) of 0.44. Inverted photovoltaic cells with the structure ITO/ethoxylated polyethlyenimine/ polymer:PC71BM/MoO3/Ag are also fabricated; the device exhibits a maximum PCE of 2.92%, with a Voc of 0.89 V, a Jsc of 6.81 mA cm−2, and an FF of 0.48.

【 授权许可】

Unknown