Exploring Transport Behavior in Hybrid Perovskites Solar Cells via Machine Learning Analysis of Environmental‐Dependent Impedance Spectroscopy

Advanced Science

Nicole Creange¹  Emanuele Quattrocchi²  Francesco Ciucci²  Ting Hei Wan²  Myung Hyun Ann³  Jong H. Kim³  Mahshid Ahmadi⁴  Dohyung Kim⁴  Sergei V. Kalinin⁵  Ilia N. Ivanov⁵  Eric S. Muckley⁵  Rama K. Vasudevan⁵ 

[1] Department of Materials Science and Engineering North Carolina State University Raleigh NC 27606 USA;Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and Technology Hong Kong;Department of Molecular Science and Technology Ajou University Suwon 16499 Republic of Korea;Joint Institute for Advanced Materials, Department of Materials Science and Engineering University of Tennessee Knoxville TN 37996 USA;The Center for Nanophase Materials Sciences Oak Ridge National Laboratory Oak Ridge TN 37831 USA;

关键词: distribution of relaxation time;    hybrid perovskites;    impedance spectroscopy;    machine learning;    solar cells;   

DOI  :  10.1002/advs.202002510

来源: DOAJ

【 摘 要 】

Abstract Hybrid organic–inorganic perovskites are one of the promising candidates for the next‐generation semiconductors due to their superlative optoelectronic properties. However, one of the limiting factors for potential applications is their chemical and structural instability in different environments. Herein, the stability of (FAPbI3)0.85(MAPbBr3)0.15 perovskite solar cell is explored in different atmospheres using impedance spectroscopy. An equivalent circuit model and distribution of relaxation times (DRTs) are used to effectively analyze impedance spectra. DRT is further analyzed via machine learning workflow based on the non‐negative matrix factorization of reconstructed relaxation time spectra. This exploration provides the interplay of charge transport dynamics and recombination processes under environment stimuli and illumination. The results reveal that in the dark, oxygen atmosphere induces an increased hole concentration with less ionic character while ionic motion is dominant under ambient air. Under 1 Sun illumination, the environment‐dependent impedance responses show a more striking effect compared with dark conditions. In this case, the increased transport resistance observed under oxygen atmosphere in equivalent circuit analysis arises due to interruption of photogenerated hole carriers. The results not only shed light on elucidating transport mechanisms of perovskite solar cells in different environments but also offer an effective interpretation of impedance responses.

【 授权许可】

Unknown