首页|High performance wide bandgap perovskite solar cell with low Voc deficit less than 0.4 V
High performance wide bandgap perovskite solar cell with low Voc deficit less than 0.4 V
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Wide bandgap perovskite solar cells(PSCs)have attracted significant attention because they can be applied to the top cells of tandem solar cells.However,high open-circuit voltage(Voc)deficit(＞0.4 V)result from poor crystallization and high non-radiative recombination losses become a serious limitation in the pursuit of high performance.Here,the relevance between different PbI2 proportions and perfor-mance parameters are revealed through analysis of surface morphology,residual stress,and photostabil-ity.The increase of PbI2 proportion promotes crystal growth and reduces the work function of the perovskite film surface and promotes the energy level alignment with the carrier transport layer,which decreased the Voc deficit.However,residual Pbl2 exacerbated the stress level of perovskite film,and the resulting lattice disorder deteriorated the photostability of the device.Ultimately,after the synergistic passivation of residual PbI2 and PEAI,the Voc achieves 1.266 V and Voc deficit is less than 0.4 V,the record value in wide bandgap PSCs.
Pb managementPerovskite solar cellStrainWide bandgapStability
School of Physical Science and Technology,Key Laboratory of Semiconductor Photovoltaic Technology and Energy Materials at Universities of Inner Mongolia Autonomous Region,Inner Mongolia University,Hohhot 010021,Inner Mongolia,China
Institute of Photoelectronic Thin Film Devices and Technology of Nankai University,Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin,Solar Energy Research Center of Nankai University,Tianjin 300350,China
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430000,Hubei,China
国家自然科学基金国家自然科学基金Inner Mongolia Higher Education Research ProjectInner Mongolia University Research Foundation for Advanced Talents in(2021)Inner Mongolia Autonomous Region for Advanced Talents in(2020)
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