probing film-depth-related light harvesting in polymer solar cells via plasma etching
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ID: 149168
2017
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Abstract
Light harvesting is the first step of photovoltaic process in polymer solar cells. However, such donor: acceptor bulk junction layers are usually featured with vertical phase segregation as well as film-depth-dependent molecular aggregation, chain orientation and crystallinity, leading to a significant variation of photon absorption and exciton generation at different film-depths. We propose an experimentally and numerically accessible method to investigate the depth-dependent light harvesting behaviors in the active layer in polymer solar cells. A low-pressure oxygen plasma is utilized to etch the active layer gradually which is monitored by a light absorption spectrometer. Including the obtained sublayer absorption spectra into transfer matrix optical model yields depth-dependent optical properties and exciton generation profiles, which contribute to quantum efficiency and short-circuit current. This approach is helpful to optimize vertical material variation and provide insights into photovoltaic process.
| Reference Key |
gao2017aipprobing
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|---|---|
| Authors | ;Shuang Gao;Laju Bu;Zhong Zheng;Xudong Wang;Weichen Wang;Ling Zhou;Jianhui Hou;Guanghao Lu |
| Journal | journal of hydrology: x |
| Year | 2017 |
| DOI |
10.1063/1.4982242
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| URL | |
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