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In article number 1601674, Tao Wang and co‐workers review conjugated‐polymer blends for organic photovoltaics. The distributions of electron donors and electron acceptors are usually heterogeneous in the vertical direction of the conjugated‐polymer photoactive layer, and can significantly influence the photovoltaic performance through their impacts on charge transport and recombination.
The photoactive layer of bulk‐heterojunction organic solar cells, in a thickness range of tens to hundreds of nanometers, comprises phase‐separated electron donors and acceptors after solution casting. The component distribution in the cross‐section of these thin films is found to be heterogeneous, with electron donors or acceptors accumulated or depleted near the electrode interfaces. This vertical...
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