A Top-Down Strategy to Engineer ActiveLayer Morphology for Highly Efficient and Stable All-Polymer Solar Cells

Huiting Fu; Zhengxing Peng; Qunping FanFrancis R. LinFeng QiYixin RanZiang WuBaobing FanKui JiangHan Young WooGuanghao LuHarald AdeAlex K.-Y. Jen

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A Top-Down Strategy to Engineer ActiveLayer Morphology for Highly Efficient and Stable All-Polymer Solar Cells

机译：A Top-Down Strategy to Engineer ActiveLayer Morphology for Highly Efficient and Stable All-Polymer Solar Cells

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A major challenge hindering the further development of all-polymer solar cells(all-PSCs) employing polymerized small-molecule acceptors is the relativelylow fill factor (FF) due to the difficulty in controlling the active-layer morphology.The issues typically arise from oversized phase separation resultingfrom the thermodynamically unfavorable mixing between two macromolecularspecies, and disordered molecular orientation/packing of highly anisotropicpolymer chains. Herein, a facile top-down controlling strategy to engineer themorphology of all-polymer blends is developed by leveraging the layer-by-layer(LBL) deposition. Optimal intermixing of polymer components can be achievedin the two-step process by tuning the bottom-layer polymer swelling duringtop-layer deposition. Consequently, both the molecular orientation/packing ofthe bottom layer and the molecular ordering of the top layer can be optimizedwith a suitable top-layer processing solvent. A favorable morphology withgradient vertical composition distribution for efficient charge transport andextraction is therefore realized, affording a high all-PSC efficiency of 17.0 witha FF of 76.1. The derived devices also possess excellent long-term thermalstability and can retain >90 of their initial efficiencies after being annealed at65 °C for 1300 h. These results validate the distinct advantages of employingan LBL processing protocol to fabricate high-performance all-PSCs.

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来源
《Advanced Materials》 |2022年第33期|2202608.1-2202608.11|共11页
作者
Huiting Fu; Zhengxing Peng; Qunping FanFrancis R. LinFeng QiYixin RanZiang WuBaobing FanKui JiangHan Young WooGuanghao LuHarald AdeAlex K.-Y. Jen;
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作者单位

Department of Materials Science and EngineeringCity University of Hong KongKowloon 999077, Hong Kong, Hong Kong Institute for Clean EnergyCity University of Hong KongKowloon 999077, Hong Kong;

Department of Physics and Organic and Carbon Electronics Laboratories(ORaCEL)North Carolina State UniversityRaleigh, NC 27695, USA;

Hong Kong Institute for Clean EnergyCity University of Hong KongKowloon 999077, Hong Kong, Department of ChemistryCity University of Hong KongKowloon 999077, Hong KongFrontier Institute of Science and TechnologyXi’an Jiaotong UniversityXi’an 710054, P. R. ChinaDepartment of ChemistryCollege of ScienceKorea UniversitySeoul 136-713, Republic of KoreaHong Kong Institute for Clean EnergyCity University of Hong KongKowloon 999077, Hong KongDepartment of Materials Science and EngineeringCity University of Hong KongKowloon 999077, Hong Kong, Hong Kong Institute for Clean EnergyCity University of Hong KongKowloon 999077, Hong Kong, Department of ChemistryCity University of Hong KongKowloon 999;

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正文语种英语
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all-polymer solar cells; blend morphology; device stability; layer-by-layer deposition; power conversion efficiency;

A Top-Down Strategy to Engineer ActiveLayer Morphology for Highly Efficient and Stable All-Polymer Solar Cells

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