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Tuning Morphology of Active Layer by using a Wide Bandgap Oligomer‐Like Donor Enables Organic Solar Cells with Over 18% Efficiency

Wanying FengState Key Laboratory and Institute of Elemento‐Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials College of Chemistry Nankai University Tianjin 300071 ChinaSimin WuState Key Laboratory and Institute of Elemento‐Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials College of Chemistry Nankai University Tianjin 300071 ChinaHongbin ChenState Key Laboratory and Institute of Elemento‐Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials College of Chemistry Nankai University Tianjin 300071 ChinaLingxian MengState Key Laboratory and Institute of Elemento‐Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials College of Chemistry Nankai University Tianjin 300071 ChinaFangfang HuangState Key Laboratory and Institute of Elemento‐Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials College of Chemistry Nankai University Tianjin 300071 ChinaHuazhe LiangState Key Laboratory and Institute of Elemento‐Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials College of Chemistry Nankai University Tianjin 300071 ChinaJianqi ZhangCAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 ChinaZhixiang WeiCAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 ChinaXiangjian WanState Key Laboratory and Institute of Elemento‐Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials College of Chemistry Nankai University Tianjin 300071 ChinaChenxi LiState Key Laboratory and Institute of Elemento‐Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials College of Chemistry Nankai University Tianjin 300071 ChinaZhaoyang YaoState Key Laboratory and Institute of Elemento‐Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials College of Chemistry Nankai University Tianjin 300071 ChinaYongsheng ChenState Key Laboratory and Institute of Elemento‐Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer Materials College of Chemistry Nankai University Tianjin 300071 China

2022en

ABI

Annotatsiya

Abstract A wide bandgap oligomer‐like donor CNS‐6‐8 is synthesized and incorporated into the host PM6 : Y6 : PC 71 BM system to tune the morphology of the active layer for better device performance. Due to the good miscibility of CNS‐6‐8 with both host donor ( PM6 ) and acceptors ( Y6 and PC 71 BM ), an optimized morphology is achieved with the appropriate phase separation size and enhanced crystallinity, which ultimately leads to more efficient exciton dissociation, charge transport, and lower nonradiative energy loss. As a result, the quaternary device achieves an improved efficiency of 18.07%, with a simultaneously increased open circuit voltage of 0.868 V, fill factor of 78.8%, and the comparable short‐circuit current density of 26.43 mA cm −2 . This work indicates that the favorable 3D interpenetrating network morphology of Y6 containing blend films can be optimized by introducing small amount of a specific molecule with high crystallinity, thus providing an effective strategy to achieve better photovoltaic performance for state‐of‐the‐art Y6 analogs‐based organic solar cells.

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Identifikatorlar

DOI: 10.1002/aenm.202104060

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