An effective bilayer cathode buffer for highly efficient small molecule organic solar cells |
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Authors: | Hao-Wu Lin Hao-Wei Kang Zheng-Yu Huang Chang-Wen Chen Yi-Hong Chen Li-Yen Lin Francis Lin Ken-Tsung Wong |
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Affiliation: | 1. Department of Materials Science and Engineering, National Tsing Hua University, Hsin Chu 30013, Taiwan;2. Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan |
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Abstract: | Novel organic/ultrathin low work function metal bilayer cathode buffers for small molecule organic solar cells are proposed. Ultrathin low work function metal layers possess a high built-in electric field for effective carrier extraction and a high cathode reflectivity for maximum absorption in the photoactive layers. This leads to a significant increase of short circuit current density and fill factor of cells. By integrating this bilayer cathode buffer with DTDCTB:C60 small molecular heterojunction, the device exhibits a high power conversion efficiency of up to 5.28%, which is an improvement of 22% compared to a device with a traditional single organic layer buffer. |
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Keywords: | Organic photovoltaics Cathode buffer Electron transporting layer Small molecule solar cells |
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