Статья

Fibrillization of Non‐Fullerene Acceptors Enables 19% Efficiency Pseudo‐Bulk Heterojunction Organic Solar Cells

Donghui LiSchool of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 ChinaNan DengWuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 ChinaYiwei FuSchool of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 ChinaChuanhang GuoSchool of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 ChinaBojun ZhouSchool of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 ChinaLiang WangSchool of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 ChinaJing ZhouSchool of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 ChinaDan LiuSchool of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 ChinaWei LiSchool of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 ChinaKai WangWuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 ChinaYanming SunSchool of Chemistry Beihang University Beijing 100191 ChinaTao WangSchool of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China

2022en

ABI

Аннотация

The structural order and aggregation of non-fullerene acceptors (NFA) are critical toward light absorption, phase separation, and charge transport properties of their photovoltaic blends with electron donors, and determine the power conversion efficiency (PCE) of the corresponding organic solar cells (OSCs). In this work, the fibrillization of small molecular NFA L8-BO with the assistance of fused-ring solvent additive 1-fluoronaphthalene (FN) to substantially improve device PCE is demonstrated. Molecular dynamics simulations show that FN attaches to the backbone of L8-BO as the molecular bridge to enhance the intermolecular packing , inducing 1D self-assembly of L8-BO into fine fibrils with a compact polycrystal structure. The L8-BO fibrils are incorporated into a pseudo-bulk heterojunction (P-BHJ) active layer with D18 as a donor, and show enhanced light absorption, charge transport, and collection properties, leading to enhanced PCE from 16.0% to an unprecedented 19.0% in the D18/L8-BO binary P-BHJ OSC, featuring a high fill factor of 80%. This work demonstrates a strategy for fibrillating NFAs toward the enhanced performance of OSCs.

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Идентификаторы

DOI: 10.1002/adma.202208211

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