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All-small-molecule organic solar cells with over 14% efficiency by optimizing hierarchical morphologies.


ABSTRACT: The high efficiency all-small-molecule organic solar cells (OSCs) normally require optimized morphology in their bulk heterojunction active layers. Herein, a small-molecule donor is designed and synthesized, and single-crystal structural analyses reveal its explicit molecular planarity and compact intermolecular packing. A promising narrow bandgap small-molecule with absorption edge of more than 930?nm along with our home-designed small molecule is selected as electron acceptors. To the best of our knowledge, the binary all-small-molecule OSCs achieve the highest efficiency of 14.34% by optimizing their hierarchical morphologies, in which the donor or acceptor rich domains with size up to ca. 70?nm, and the donor crystals of tens of nanometers, together with the donor-acceptor blending, are proved coexisting in the hierarchical large domain. All-small-molecule photovoltaic system shows its promising for high performance OSCs, and our study is likely to lead to insights in relations between bulk heterojunction structure and photovoltaic performance.

SUBMITTER: Zhou R 

PROVIDER: S-EPMC6879588 | biostudies-literature | 2019 Nov

REPOSITORIES: biostudies-literature

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All-small-molecule organic solar cells with over 14% efficiency by optimizing hierarchical morphologies.

Zhou Ruimin R   Jiang Zhaoyan Z   Yang Chen C   Yu Jianwei J   Feng Jirui J   Adil Muhammad Abdullah MA   Deng Dan D   Zou Wenjun W   Zhang Jianqi J   Lu Kun K   Ma Wei W   Gao Feng F   Wei Zhixiang Z  

Nature communications 20191126 1


The high efficiency all-small-molecule organic solar cells (OSCs) normally require optimized morphology in their bulk heterojunction active layers. Herein, a small-molecule donor is designed and synthesized, and single-crystal structural analyses reveal its explicit molecular planarity and compact intermolecular packing. A promising narrow bandgap small-molecule with absorption edge of more than 930 nm along with our home-designed small molecule is selected as electron acceptors. To the best of  ...[more]

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