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 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
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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