Bulk heterojunction organic photovoltaic devices based on small molecules featuring pyrrole and carbazole and 2-(4-nitrophenyl)acrylonitrile acceptor segments as donor and fullerene derivatives as acceptor

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• 作者：G.D. Sharma^a ; ^b ; ^{sharmagd_in@yahoo.com} ; J.A. Mikroyannidis^c ; S.S. Sharma^d ; K.R. Justin Thomas^e ;
• 关键词：Conjugated small molecules ; Pyrrole and carbazole donor units ; Bulk heterojunction solar cell ; Solvent additives ; Nanoscale morphology ; Modified PCBM
• 刊名：Dyes and Pigments
• 出版年：2012
• 期刊代码：31_01437208
• 类别：ms
• 出版时间：August, 2012
• 卷：94
• 期：2
• 页码：320-329
• 文件大小：1431 K

摘要

The bulk heterojunction photovoltaic devices based on based on low band gap donor-acceptor (D-A) small molecules, with pyrrole (P) and carbazole (C) as donor and 2- (4-nitroohenyl) acceptor units as electron donor and (6,6)-phenyl- C₆₀ - butyric acid methyl ester (PCBM) and modified PCBM i.e. F as electron acceptor were fabricated and characterized. The power conversion efficiency (PCE) of the BHJ organic solar cells based on P: PCBM, C: PCBM, P:F and C:F cast from the THF solvent was 1.20%, 1.46%, 1.90%, 2.06%, respectively. The enhanced PCE for the devices based on F as compared to the PCBM may be due to the both increased short circuit current (J_sc) and open circuit voltage (V_oc). The BHJ organic solar cells based on P:F and C:F blends cast from mixed DIO/THF solvent exhibit over all PCE of 2.41%and 3.13%, respectively.