【摘 要】
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Organic single-crystals are ideal candidates for high-performance photovoltaics due to their high charge mobility and long exciton diffusion length; however
【机 构】
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MOEKeyLaboratoryofMacromolecularSynthesisandFunctionalization,StateKeyLaboratoryofSiliconMaterials,D
论文部分内容阅读
Organic single-crystals are ideal candidates for high-performance photovoltaics due to their high charge mobility and long exciton diffusion length; however,they have not been largely considered for photovoltaics due to the practical difficulty in making a heterojunction between donor and acceptor single-crystals.Here,we demonstrate extended single-crystalline heterojunctions with donor-top and acceptor-bottom structure throughout the substrate can be simply obtained from a mixed solution of 3,6-bis(5-(4-n-butylphenyl)thiophene-2-yl)-2,5-bis(2-ethylhexyl)pyrrolo[3,4-c]pyrrole-1,4-dione(donor)and C60(acceptor).The heterojunctions exhibited ambipolar charge transport behavior with an FET mobility of 0.0026 ± 0.0015 cm2·V-1·s-1 for hole and 0.28 ± 0.12 cm2·V-1·s-1 for electron.The consistent donor-top and acceptor-bottom structure facilitates solar cell fabrication and 46 devices were studied with the power conversion efficiency on the order of 0.1%under 1 sun,which is significantly higher than the previously-reported value for organic single-crystalline donor-acceptor heterojunction(0.007%).As such,this work opens a practical avenue for the study of photovoltaics based on organic single-crystals.It also provides a possibility to study emergent physics at organic crystal interfaces.
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