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Proceedings Paper

Remarkable carrier diffusion length and slow carrier cooling in mixed halide perovskite
Author(s): Kamlesh Kumar Chauhan; Sayan Prodhan; Sayan Bhattacharya; Pranab Kumar Dutta; Prasanta Kumar Datta
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Paper Abstract

In this work, transient absorption (TA) spectra of lead based organic-inorganic mixed halide (CH3NH3PbI3-xClx) perovskite thin film were investigated under excitation of femto-second pump pulse (400 nm, 60 fs) for various carrier density (1018-1019 cm-3). The ultrafast hot carrier (HC) relaxation dynamics is examined by fitting the high energy tail (1.8-2.0 eV) of bleaching band when pumping (~2.63 eV) above the perovskite band-gap (~1.6 eV). It shows that HCs cool down via electron-LO phonon emission over ~800 fs. However cooling is slows down due to delayed relaxation of LO phonon into acoustic phonon in ~11 ps and shows “photon bottleneck” at higher carrier injection density. Further, the decay dynamics of band limited bleaching peak signal around 1.69 eV (730 nm) obtained from TA spectra is well studied to predict the rate constant of radiative recombination. The results shows radiative recombination rate of 10-11 cm-3s-1 and effective diffusion length of ~10 μm in mixed halide perovskite.

Paper Details

Date Published: 1 April 2020
PDF: 7 pages
Proc. SPIE 11366, Photonics for Solar Energy Systems VIII, 113660G (1 April 2020); doi: 10.1117/12.2551597
Show Author Affiliations
Kamlesh Kumar Chauhan, Indian Institute of Technology Kharagpur (India)
Sayan Prodhan, Indian Institute of Technology Kharagpur (India)
Sayan Bhattacharya, Indian Institute of Science Education and Research Kolkata (India)
Pranab Kumar Dutta, Indian Institute of Technology Kharagpur (India)
Prasanta Kumar Datta, Indian Institute of Technology Kharagpur (India)

Published in SPIE Proceedings Vol. 11366:
Photonics for Solar Energy Systems VIII
Alexander N. Sprafke; Jan Christoph Goldschmidt; Gregory Pandraud, Editor(s)

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