Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 18, Issue 5, Pages 3438-3443Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp05080d
Keywords
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Funding
- Department of Science and Technology, the Solar Energy Research Initiative project under Govt. of India [DST/TM/SERI/2k11/73(G)]
- Ministry of Human Resource Development under Govt. of India
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Inverted bulk heterojunction solar cells based on low temperature solution processed squaraine (SQ) and [6,6]-phenyl C-71 butyric acid methyl-ester (PC71BM) with varying blend ratios were made in air. An optimized bulk heterojunction device of SQ and PC71BM (with a blend ratio of 1:6) showed a power conversion efficiency (PCE) of 2.45% with an incident photon to current conversion efficiency of 65% at 680 nm and a spectral window extending to the NIR region. The devices also showed an enhanced PCE value of 4.12% upon continuous illumination from an AM1.5G light source of intensity 1 Sun. The intensity dependent photocurrent studies showed a monomolecular recombination mechanism in the photovoltaic device performance. The device stored in air showed reasonable stability for a period of one month.
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