期刊
DYES AND PIGMENTS
卷 94, 期 2, 页码 320-329出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2011.12.008
关键词
Conjugated small molecules; Pyrrole and carbazole donor units; Bulk heterojunction solar cell; Solvent additives; Nanoscale morphology; Modified PCBM
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- C-60- 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. (C) 2012 Elsevier Ltd. All rights reserved.
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