Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3297876
Keywords
cathodes; fullerenes; lithium compounds; organic compounds; solar cells
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Funding
- New Energy and Industrial Technology Development Organization (NEDO)
- Ministry of Education, Culture, Sports, Science and Technology of Japan
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Reduced initial degradation of bulk heterojunction organic solar cells (OSCs) was achieved by inclusion of stacked fullerene (C(60)) and lithium fluoride interlayers. By inserting a 3 nm C(60) layer and a 0.5 nm LiF layer between the photoactive layer and Al cathode in an OSC, the device lifetime calculated after an initial 8 h continuous illumination period was dramatically improved, with a decrease of only 5% in the power conversion efficiency. The 3 nm C(60) layer forms a unique surface pattern of microscopic domes, and the combination of this layer with a 0.5 nm LiF layer formed an Ohmic-like contact between the photoactive layer and the Al cathode, resulting in a significant reduction in the degradation of the OSC.
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