In-situ observation of trapped carriers in organic metal halide perovskite films with ultra-fast temporal and ultra-high energetic resolutions
| Autor: | Jianbo Gao, Yehonadav Bekenstein, Jianbing Zhang, Apparao M. Rao, Wanyi Nie, Matthew C. Beard, Shreetu Shrestha, Feng Yan, Hsinhan Tsai, Lawrence Coleman, Ying Shi, Yuanyuan Zhou, Kanishka Kobbekaduwa, Exian Liu, Pan Adhikari |
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| Rok vydání: | 2020 |
| Předmět: |
Solar cells
Electron mobility Materials science Electronic properties and materials Science Physics::Optics General Physics and Astronomy 02 engineering and technology 010402 general chemistry 01 natural sciences General Biochemistry Genetics and Molecular Biology Article Condensed Matter::Materials Science Physics::Atomic Physics Thin film Perovskite (structure) Photocurrent Condensed Matter::Quantum Gases Multidisciplinary business.industry General Chemistry Nanosecond 021001 nanoscience & nanotechnology 0104 chemical sciences Semiconductor Semiconductors Chemical physics Picosecond Charge carrier 0210 nano-technology business |
| Zdroj: | Nature Communications Nature Communications, Vol 12, Iss 1, Pp 1-7 (2021) |
| ISSN: | 2041-1723 |
| Popis: | We in-situ observe the ultrafast dynamics of trapped carriers in organic methyl ammonium lead halide perovskite thin films by ultrafast photocurrent spectroscopy with a sub-25 picosecond time resolution. Upon ultrafast laser excitation, trapped carriers follow a phonon assisted tunneling mechanism and a hopping transport mechanism along ultra-shallow to shallow trap states ranging from 1.72–11.51 millielectronvolts and is demonstrated by time-dependent and independent activation energies. Using temperature as an energetic ruler, we map trap states with ultra-high energy resolution down to Defect states in perovskites dictate the charge carriers behaviour, thus the ultimate optical and electrical properties. Here, the authors in-situ investigate trapped carrier dynamics in MAPbI3 thin films with ultra-fast temporal and high energetic resolution by means of ultrafast photocurrent spectroscopy. |
| Databáze: | OpenAIRE |
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