Unified model for describing the evolution of negative capacitance in perovskite solar cells

• DOI: 10.1103/physrevapplied.22.024041
• Publication Date: 2024-08-14T14:09:11Z
• Authors: Junhui Wu; Cheng Yang; Zhenwang Luo; Xu Wang; Fei Zheng; Zhenfu Zhao; Ziyang Hu
• Keywords: Polarity (international relations)

The negative capacitance (NC) effect observed in perovskite-based devices is a unique phenomenon that remains subject to debate regarding its origin. In this study, we present unified model aimed at describing these NC features, providing valuable insights into the coupling of ionic and electronic properties give rise behavior. Through meticulous analysis impedance spectra, capacitance-frequency relationships, current-voltage profiles under varying conditions light intensity bias voltage, aim uncover underlying sources perovskite solar cells (PSCs). Our findings suggest emergence PSCs directly correlates with migration both positive ions toward uppermost lowermost surfaces layer. Moreover, polarity low frequencies determined by predominant recombination pathway within device. We comprehensively describes evolution PSCs. This not only elucidates experimental observations but also confirms connection between mechanisms.