Surface Polarity Regulation by Relieving Fermi-Level Pinning with Naphthalocyanine Tetraimides toward Efficient Perovskite Solar Cells with Improved Photostability

Qin Zhou; Chunsheng Cai; Qin XiongZilong ZhangJianbin XuLusheng LiangShibo WangWeihai SunZhongyi YuanPeng Gao

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Surface Polarity Regulation by Relieving Fermi-Level Pinning with Naphthalocyanine Tetraimides toward Efficient Perovskite Solar Cells with Improved Photostability

机译：Surface Polarity Regulation by Relieving Fermi-Level Pinning with Naphthalocyanine Tetraimides toward Efficient Perovskite Solar Cells with Improved Photostability

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In perovskite solar cells (PSCs), defective perovskite grain boundaries (GBs)and/or surface due to photo-excitation and the resulted suboptimal carrierdynamics at the perovskite/charge transport layer, have largely limited furtherperformance enhancement and aggravated the PSCs instability. Fundamentallypreventing the formation of these trap-states through a simple and efficientapproach is thus critical to the enhancement of both device performance andstability. Herein, a novel semiconductive silicon naphthalocyanine derivative(Cl-SiNcTI) to reduce the deep level trap states at the GBs and the surface ofperovskite film is successfully employed via a newly proposed photon-relaxationmechanism. The resulting benign p-type surface polarity and suppressed nonradiationrecombination lead to improved charge transport in bulk perovskiteand at the perovskite/spiro-OMeTAD interface. With a synergistic contributionof the Cl-SiNcTI and 2-(2-Fluorophenyl)ethylamine iodide (oFPEAI), a 24.30%efficiency is achieved in a single cell with excellent operational stability. Moreover,under steady-state light illumination, 93% power output compared to itsinitial state can still be maintained after 250 h of continuous operation.

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来源
《Advanced energy materials》 |2022年第27期|2201243.1-2201243.10|共10页
作者
Qin Zhou; Chunsheng Cai; Qin XiongZilong ZhangJianbin XuLusheng LiangShibo WangWeihai SunZhongyi YuanPeng Gao;
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CAS Key Laboratory of Design and Assembly of Functional Nanostructures,and Fujian Provincial Key Laboratory of Nanomaterials Fujian Institute ofResearch on the Structure of MatterChinese Academy of SciencesFuzhou, Fujian 350002, China,Laboratory for Advan;

Institute of Polymers and Energy Chemistry (IPEC)College of ChemistryNanchang University999 Xuefu Avenue, Nanchang 330031, China;

College of Materials Science and EngineeringHuaqiao UniversityXiamen 361021, China;

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正文语种英语
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charge extraction; energy passivation; Fermi-level pinning; naphthalocyanine; perovskite solar cells;

Surface Polarity Regulation by Relieving Fermi-Level Pinning with Naphthalocyanine Tetraimides toward Efficient Perovskite Solar Cells with Improved Photostability

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