Anti-Dissociation Passivation via Bidentate Anchoring for Efficient Carbon-Based CsPbI_(2.6)Br_(0.4) Solar Cells

Yongyu Liao; Jianxin Zhang; Wenran WangZechao YangRong HuangJiage LinLei CheGuoying YangZhenxiao PanHuashang RaoXinhua Zhong

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Anti-Dissociation Passivation via Bidentate Anchoring for Efficient Carbon-Based CsPbI_(2.6)Br_(0.4) Solar Cells

机译：Anti-Dissociation Passivation via Bidentate Anchoring for Efficient Carbon-Based CsPbI_(2.6)Br_(0.4) Solar Cells

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Molecular passivation on perovskite surface is an effective strategy to inhibitsurface defect-assisted recombination and reduce nonradiative recombinationloss in perovskite solar cells (PSCs). However, the majority of passivatingmolecules bind to perovskite surface through weak interactions, resulting inweak passivation effects and susceptible to interference from various factors.Especially in carbon-based perovskite solar cells (C-PSCs), the molecularpassivation effect is more susceptible to disturbance in subsequent harshpreparation of carbon electrodes via blade-coating route. Herein, bidentateligand 2,2′-Bipyridine (2Bipy) is explored to passivate surface defectsof CsPbI_(2.6)Br_(0.4) perovskite films. The results indicate that compared withmonodentate pyridine (Py), bidentate 2Bipy shows a stronger chelation withuncoordinated Pb(II) defects and exhibits a greater passivation effect onperovskite surface. As a result, 2Bipy-modified perovskite films display asignificantly boosted photoluminescence lifetime, accompanied by excellentanchoring stability and anti-dissociation of passivating molecules. Meanwhile,the moisture resistance of the 2Bipy-modified perovskite films is alsosignificantly enhanced. Consequently, the efficiency of C-PSCs is improved to16.57% (J_(sc) = 17.16 mA cm~(?2), V_(oc) = 1.198 V, FF = 80.63%). As far as it is known,this value represents a new record efficiency for hole transport material-freeinorganic C-PSCs.

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来源
《Advanced functional materials》 |2023年第20期|2214784.1-2214784.8|共8页
作者
Yongyu Liao; Jianxin Zhang; Wenran WangZechao YangRong HuangJiage LinLei CheGuoying YangZhenxiao PanHuashang RaoXinhua Zhong;
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Key Laboratory for Biobased Materials and Energy of Ministry ofEducationGuangdong Laboratory for Lingnan Modern AgricultureCollege of Materials and EnergySouth China Agricultural UniversityGuangzhou 510642, China;

Zhejiang Eco Environmental Technology Co. LTDHuzhou 313000, China;

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2; 2′-bipyridine; bidentate ligands; carbon electrodes; inorganic perovskites; perovskite solar cells;

Anti-Dissociation Passivation via Bidentate Anchoring for Efficient Carbon-Based CsPbI_(2.6)Br_(0.4) Solar Cells

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