Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6536188 | Solar Energy Materials and Solar Cells | 2013 | 5 Pages |
Abstract
We demonstrate response and lifetime improvements for organic photovoltaic (OPV) by using organic bathophenanthroline (Bphen) and inorganic molybdenum oxide (MoO3) as a compound cathode buffer layer (CBL). Not only power conversion efficiency (PCE) increases by 27% but also working and storage lifetimes extend at least 10 and 60 times respectively comparing with PV cell with 5Â nm thick Bphen as CBL. The optimized PV structure is ITO/CuPc (20Â nm)/C60 (40Â nm)/Bphen (2Â nm)/MoO3 (5Â nm)/Al and the CBL of the reference device is 5Â nm Bphen without MoO3 layer. The achievement of PV performance and lifetime improvement by introducing such a compound CBL is attributed to appropriate level alignment between C60, Bphen and MoO3, and stable inorganic MoO3 can prevent from superior oxygen and moisture diffusion into the C60 acceptor layer. The detailed working mechanism of the compound Bphen/MoO3 CBL in the OPV cells is also argued.
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Authors
Fangming Jin, Bei Chu, Wenlian Li, Zisheng Su, Bo Zhao, Xingwu Yan, Feng Zhang, Di Fan, Tianyou Zhang, Yuan Gao, C.S. Lee, Junbo Wang,