Remarkable carrier diffusion length and slow carrier cooling in mixed halide perovskite

Kamlesh Kumar Chauhan; Sayan Prodhan; Sayan Bhattacharya; Pranab Kumar Dutta; Prasanta Kumar Datta

doi:10.1117/12.2551597

1 April 2020 Remarkable carrier diffusion length and slow carrier cooling in mixed halide perovskite

Kamlesh Kumar Chauhan, Sayan Prodhan, Sayan Bhattacharya, Pranab Kumar Dutta, Prasanta Kumar Datta

Proceedings Volume 11366, Photonics for Solar Energy Systems VIII; 113660G (2020) https://doi.org/10.1117/12.2551597
Event: SPIE Photonics Europe, 2020, Online Only

Abstract

In this work, transient absorption (TA) spectra of lead based organic-inorganic mixed halide (CH₃NH₃PbI_3-xCl_x) 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.

Citation Download Citation

Kamlesh Kumar Chauhan, Sayan Prodhan, Sayan Bhattacharya, Pranab Kumar Dutta, and Prasanta Kumar Datta "Remarkable carrier diffusion length and slow carrier cooling in mixed halide perovskite", Proc. SPIE 11366, Photonics for Solar Energy Systems VIII, 113660G (1 April 2020); https://doi.org/10.1117/12.2551597

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