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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/24614
Title: Cation-dependent hot carrier cooling in the lead-free bismuth halide a3bi2i9 (a = fa, ma, and cs) perovskite
Authors: De A.K.
Satapathi, Soumitra
Tailor N.K.
Mishra S.
Sharma T.
Published in: Journal of Physical Chemistry C
Abstract: Lead-free halide perovskites, as environment-friendly materials, have received critical interest in photovoltaic applications. In this regard, the bismuth halide perovskites demonstrate better stability under ambient conditions than lead halide perovskites and consequently remain one of the critical areas for the development of lead-free absorber materials. The steady-state optical properties are widely investigated in these bismuth halide perovskites, but excited-state charge carrier dynamics such as hot carrier relaxation remain elusive. However, it is crucial to investigate the rapid relaxation of above band gap "hot" carriers as it restricts the fundamental efficiency limit in the perovskite solar cells. Here, we demonstrate the cation-dependent hot carrier cooling in the lead-free A3Bi2I9 [A = FA (formamidinium), MA (methylammonium), and Cs (cesium)] perovskite by using femtosecond transient absorption spectroscopy. These lead-free perovskites were fabricated from gamma-butyrolactone (γ-GBL) solvent to ensure uniformity and continuity of the as-grown film and were well characterized by XRD, SEM, and steady-state absorption and photoluminescence spectroscopy. With varying A-cations, we observe that the hot-hole relaxation is slowest in the all-inorganic perovskite Cs3Bi2I9 (12.83 ps) and hot electron relaxation is slowest in the hybrid MA3Bi2I9 perovskite (6.42 ps) at the same excitation energy. The observed strong dependence of carrier cooling on cation composition is explained by the interaction between the different organic cations (A = FA, MA, and Cs) with the Pb-Br frameworks. Our study provides an opportunity to understand the effect of cations on the excited-state carrier dynamics, especially the hot carrier relaxation in the bismuth halide perovskites. This will pave the way for designing hot carrier-based high-efficient lead-free perovskite photovoltaic devices. © 2021 American Chemical Society. All rights reserved.
Citation: Journal of Physical Chemistry C, 125(18): 9891-9898
URI: https://doi.org/10.1021/acs.jpcc.1c01509
http://repository.iitr.ac.in/handle/123456789/24614
Issue Date: 2021
Publisher: American Chemical Society
Keywords: Absorption cooling
Absorption spectroscopy
Bismuth compounds
Bromine compounds
Energy gap
Excited states
Hot carriers
Lead metallography
Optical properties
Perovskite
Perovskite solar cells
Photoluminescence spectroscopy
Positive ions
Charge carrier dynamics
Environment-friendly materials
Femtosecond transient absorption spectroscopy
Hot-carrier relaxation
Lead-free perovskites
Photovoltaic applications
Photovoltaic devices
Steady-state absorption
Lead compounds
ISSN: 19327447
Author Scopus IDs: 22979194400
36610769900
57211634045
57219671052
57219759100
Author Affiliations: De, A.K., Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Mohali, Punjab, 140306, India
Satapathi, S., Department of Physics, Indian Institute of Technology Roorkee, Haridwar, Uttarakhand, 247667, India
Tailor, N.K., Department of Physics, Indian Institute of Technology Roorkee, Haridwar, Uttarakhand, 247667, India
Mishra, S., Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Mohali, Punjab, 140306, India
Sharma, T., Department of Physics, Indian Institute of Technology Roorkee, Haridwar, Uttarakhand, 247667, India
Funding Details: N.K.T. acknowledges the UGC research fellowship. S.S. acknowledges the Ministry of Electronics and Information Technology Award DIC-1377-PHY. University Grants Committee, UGC; Ministry of Electronics and Information technology, Meity: DIC-1377-PHY
Corresponding Author: De, A.K.; Department of Chemical Sciences, India; email: akde@iisermohali.ac.in Satapathi, S.; Department of Physics, India; email: soumitra.satapathi@ph.iitr.ac.in
Appears in Collections:Journal Publications [PH]

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