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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 35, Number 5
BKCSDE 35(5)
May 20, 2014 

Conventional and Inverted Photovoltaic Cells Fabricated Using New Conjugated Polymer Comprising Fluorinated Benzotriazole and Benzodithiophene Derivative
Ji-Hoon Kim, Chang Eun Song, In-Nam Kang, Won Suk Shin, Zhi-Guo Zhang, Yongfang Li, Do-Hoon Hwang*
Fluorine-substituted benzotriazole, Medium band gap semiconducting polymer, Organic photovoltaic cell
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.
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