首页|Buried interface management via bifunctional NH4BF4 towards efficient CsPbI2Br solar cells with a Voc over 1.4 V

Buried interface management via bifunctional NH4BF4 towards efficient CsPbI2Br solar cells with a Voc over 1.4 V

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CsPbI2Br perovskite solar cells(PSCs)have drawn tremendous attention due to their suitable bandgap,excellent photothermal stability,and great potential as an ideal candidate for top cells in tandem solar cells.However,the abundant defects at the buried interface and perovskite layer induce severe charge recombination,resulting in the open-circuit voltage(Voc)output and stability much lower than antici-pated.Herein,a novel buried interface management strategy is developed to regulate interfacial carrier dynamics and CsPbI2Br defects by introducing ammonium tetrafluoroborate(NH4BF4),thereby resulting in both high CsPbl2Br crystallization and minimized interfacial energy losses.Specifically,NH4+ions could preferentially heal hydroxyl groups on the SnO2 surface and balance energy level alignment between SnO2 and CsPbl2Br,enhancing charge transport efficiency,while BF4-anions as a quasi-halogen regulate crystal growth of CsPbI2Br,thus reducing perovskite defects.Additionally,it is proved that eliminating hydroxyl groups at the buried interface enhances the iodide migration activation energy of CsPbI2Br for strengthening the phase stability.As a result,the optimized CsPbl2Br PSCs realize a remarkable effi-ciency of 17.09％and an ultrahigh Voc output of 1.43 V,which is one of the highest values for CsPbI2Br PSCs.

Inorganic perovskiteBuried interfaceDefectStabilityOpen-circuit voltage loss

Fazheng Qiu、Ming-Hua Li、Jinpeng Wu、Jin-Song Hu

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School of Materials Science and Engineering,NingboTech University,Ningbo 315100,Zhejiang,China

Beijing National Laboratory for Molecular Sciences(BNLMS),Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China

College of Chemical Engineering,Beijing Advanced Innovation Center for Soft Matter Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China

School of Chemical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaChinese Academy of Sciences

223790102210916622309191

2024

10.1016/j.jechem.2023.10.053

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.89(2)
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