Journal
APPLIED PHYSICS LETTERS
Volume 102, Issue 14, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4801647
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Funding
- New Energy and Industrial Technology Development Organization (NEDO)
- BEANS Lab, Japan
- Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST)
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER)
- MEXT
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Highly efficient photovoltaic cells based on a bulk heterojunction configuration composed of C-70 with various donor materials at 5 wt. % donor concentration were fabricated. The tetraphenyldibenzoperiflanthene (DBP) donor achieved the highest power conversion efficiency (eta(PCE)) of 6.4% for the optimized cell. The improved performance with DBP arises from a combination of a higher absorption coefficient than 1,1-bis-(4-bis(4-methyl-phenyl)-amino-phenyl)-cyclohexane and a symmetrical molecular structure. The high eta(PCE) with only 5 wt. % donor is attributed to a sufficient donor concentration for enhanced Frenkel exciton dissociation in C-70, while efficiency and electron mobility decrease at higher donor concentrations. (C) 2013 AIP Publishing LLC
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