首页|Modulation on electrostatic potential to build a firm bridge at NiOx/perovskite interface for efficient and stable perovskite solar cells
Modulation on electrostatic potential to build a firm bridge at NiOx/perovskite interface for efficient and stable perovskite solar cells
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The NiOx/perovskite interface in NiOx-based inverted perovskite solar cells(PSCs)is one of the main issues that restrict device performance and long-term stability,as the unwanted interfacial defects and undesirable redox reactions cause severe interfacial non-radiative recombination and open-circuit volt-age(Voc)loss.Herein,a series of self-assembled molecules(SAMs)are employed to bind,bridge,and sta-bilize the NiOx/perovskite interface by regulating the electrostatic potential.Based on systematically theoretical and experimental studies,4-pyrazolecarboxylic acid(4-PCA)is proven as an efficient mole-cule to simultaneously passivate the NiOx and perovskite surface traps,release the interfacial tensile stress as well as quench the detrimental interface redox reactions,thus effectively suppressing the inter-facial non-radiative recombination and enhancing the quality of perovskite crystals.Consequently,the PSCs with 4-PCA treatment exhibited an eminently increased Voc,leading to a significant increase in power conversion efficiency from 21.28％to 23.77％.Furthermore,the unencapsulated devices maintain 92.6％and 81.3％of their initial PCEs after storing in air with a relative humidity of 20％-30％for 1000 h and heating at 65 ℃ for 500 h in a N2-filled glovebox,respectively.
Perovskite solar cellsNickel oxideInterface defects passivationRedox reactionNonradiative recombination
Chongqing Key Laboratory of Interface Physics in Energy Conversion,College of Physics,Chongqing University,Chongqing 401331,China
Key Laboratory of Optoelectronic Technology & Systems(Ministry of Education),College of Optoelectronic Engineering,Chongqing University,Chongqing 400044,China
Center of Modern Physics,Institute for Smart City of Chongqing University in Liyang,Liyang 213300,Jiangsu,China
National Natural Science Foundation of ChinaFundamental Research Funds for the Central Universities
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