Premature perovskite films rapidly form at the FAI/PbI_(2)interface,inhibiting further reactions between FAI and PbI_(2)during the fabrication of perovskite films via the evaporating-spraying hybrid method according t...Premature perovskite films rapidly form at the FAI/PbI_(2)interface,inhibiting further reactions between FAI and PbI_(2)during the fabrication of perovskite films via the evaporating-spraying hybrid method according to our previous research.In this research,triphenylphosphine oxide(TPPO)was proved to be an effective coordinator that reduces the reaction rate between FAI and PbI_(2)at the initial stage,which can be attributed to the hydrogen(H)bonds between FA^(+)and TPPO,and coordinate bonds between TPPO and PbI_(2).Additionally,the quality of perovskite films improved significantly:the trap state density decreased from 1.6×10^(18)to 3.17×10^(17)cm^(-3),while the crystal size increased from 740 to 940 nm.The champion perovskite device achieved a remarkable efficiency of 20.93%(0.09 cm^(2))and 16.75%(63.7 cm^(2)),marking one of the highest reported results for the evaporating-spraying hybrid method.Moreover,the perovskite solar cells retained over 80%of their initial performances after 600 h of storage at 60℃in a nitrogen environment without encapsulation.It also maintained approximately 90%of its initial performance after continuous illumination at 25℃for 1400 h under the same conditions.展开更多
基金supported by the National Natural Science Foundation of China(22279031)the Key Research and Development Plan of Hubei Province(2023BAB 109)+3 种基金the Longzhong Talent Planthe Joint Foundation for Innovation and Development of Hubei Natural Science Foundation(2022CFD079,2023AFD034 and 2023AFD032)Graduate Quality Engineering Funding Project of Hubei University of Arts and Sciences(YZ3202304)Independent Innovation Projects of the Hubei Longzhong Laboratory(2024KF-07 and 2024KF-33)。
文摘Premature perovskite films rapidly form at the FAI/PbI_(2)interface,inhibiting further reactions between FAI and PbI_(2)during the fabrication of perovskite films via the evaporating-spraying hybrid method according to our previous research.In this research,triphenylphosphine oxide(TPPO)was proved to be an effective coordinator that reduces the reaction rate between FAI and PbI_(2)at the initial stage,which can be attributed to the hydrogen(H)bonds between FA^(+)and TPPO,and coordinate bonds between TPPO and PbI_(2).Additionally,the quality of perovskite films improved significantly:the trap state density decreased from 1.6×10^(18)to 3.17×10^(17)cm^(-3),while the crystal size increased from 740 to 940 nm.The champion perovskite device achieved a remarkable efficiency of 20.93%(0.09 cm^(2))and 16.75%(63.7 cm^(2)),marking one of the highest reported results for the evaporating-spraying hybrid method.Moreover,the perovskite solar cells retained over 80%of their initial performances after 600 h of storage at 60℃in a nitrogen environment without encapsulation.It also maintained approximately 90%of its initial performance after continuous illumination at 25℃for 1400 h under the same conditions.
