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- W2313713004 abstract "It is generally considered that photoinduced charge transfer at the organic-inorganic interfaces in hybrid photovoltaic devices immediately results in a pair of free charge carriers. We extend a novel interface-selective ultrafast ``optical pump-push photocurrent probe'' technique to study hybrid photovoltaic systems and observe bound electron-hole pair states at the organic-inorganic interface formed between electron-accepting zinc oxide and electron-donating conjugated polymers. We estimate that $ensuremath{sim}50%$ of photogenerated charges stay bound and later recombine, thus hindering the photovoltaic performance of $mathrm{text{polymer}}/mathrm{ZnO}$ cells. We further demonstrate that interface modification with a fullerene derivative decreases the fraction of bound charges to $ensuremath{sim}25%$, which substantially improves the device efficiency." @default.
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- W2313713004 date "2012-06-15" @default.
- W2313713004 modified "2023-09-24" @default.
- W2313713004 title "Direct Observation of Photoinduced Bound Charge-Pair States at an Organic-Inorganic Semiconductor Interface" @default.
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- W2313713004 doi "https://doi.org/10.1103/physrevlett.108.246605" @default.
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