Highly efficient bifacial transparent organic solar cells with power conversion efficiency greater than 3% and transparency of 50% |
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Authors: | Hao-Wu Lin Yi-Hong Chen Zheng-Yu Huang Chang-Wen 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: | In this work, we present vacuum-deposited bifacial transparent organic solar cells on indium-tin-oxide-coated glass substrates. Good performances and high transparencies are achieved simultaneously by employing the planar-mixed heterojunction of the organic donor 2-{7-(5-N,N-ditolylaminothiophen-2-yl)-2,1,3-benzothiadiazol-4-yl]methylene}malononitrile (DTDCTB) and fullerenes with carefully designed resonance top electrodes. Comprehensive optical simulation is exploited to investigate the effect of the top-electrode configuration on the cell transparency and efficiency. Cells with structures designed for high transparencies were fabricated and tested. The DTDCTB:C60 device yields a high transmission of up to 66.4% at 530 nm and a power conversion efficiency (PCE) of 2.11%. Moreover, the DTDCTB:C70 device demonstrates an exceptional PCE as high as 3.24% with a balanced transmission of ≈50% in the visible spectrum. Enhanced PCE values of transparent solar cells are also revealed with the use of external reflectors. Efficiency enhancements of ≈15% and ≈65% are achieved by simply attaching a reflection mirror at the cathode or anode side, respectively. |
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