標題: A Direct Mapping Approach to Understand Carrier Relaxation Dynamics in Varied Regions of a Polycrystalline Perovskite Film
作者: Fathi, Amir
Jokar, Efat
Lee, Yuan-Pern
Diau, Eric Wei-Guang
交大名義發表
應用化學系
應用化學系分子科學碩博班
National Chiao Tung University
Department of Applied Chemistry
Institute of Molecular science
關鍵字: image processing;lifetime mapping;organo-inorganic halide perovskites;transient absorption microscopy;ultrafast imaging
公開日期: 1-Jan-1970
摘要: We developed a direct mapping approach to overlay the image of a polycrystalline perovskite film obtained from the transient absorption microscope (TAM) with that from the scanning electron microscope (SEM). By mapping these imaging data pixel by pixel, we are able to observe the relaxation dynamics of the photo-generated charge carriers on varied regions of the film. The carrier relaxation dynamics contain a dominated single-exponential decay component owing to the recombination of charge carriers. The lifetime distribution of charge recombination shows a bimodal feature, for which the rapid and slow distributions are assigned as free and trapped carriers, respectively. The charge recombination was slower in the grain boundary (GB) region than in the grain interior (GI) region. The small grains have longer lifetimes than the large grains for the crystal size smaller than 500 nm. Therefore, GB with retarded charge recombination might play a positive role in a perovskite solar cell.
URI: http://dx.doi.org/10.1002/anie.202008305
http://hdl.handle.net/11536/155455
ISSN: 1433-7851
DOI: 10.1002/anie.202008305
期刊: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
起始頁: 0
結束頁: 0
Appears in Collections:Articles