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Title: Photoinduced Single- and Multiple-Electron Dynamics Processes Enhanced by Quantum Confinement in Lead Halide Perovskite Quantum Dots

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [2];  [3]; ORCiD logo [4]
  1. Department of Chemistry, University of South Dakota, Vermillion, South Dakota 57069, United States
  2. Department of Physics, North Dakota State University, Fargo, North Dakota 58102, United States
  3. L.N. Gumilyov Eurasian National University, Astana 010008, Kazakhstan, National University of Science and Technology “MISIS”, Moscow, 119049 Russian Federation
  4. Department of Chemistry, University of South Dakota, Vermillion, South Dakota 57069, United States, Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58102, United States

Methylammonium lead iodide perovskite (MAPbI3) is a promising material for photovoltaic devices. A modification of MAPbI3 into confined nanostructures is expected to further increase efficiency of solar energy conversion. Photoexcited dynamic processes in a MAPbI3 quantum dot (QD) have been modeled by many-body perturbation theory and nonadiabatic dynamics. A photoexcitation is followed by either exciton cooling (EC), its radiative (RR) or nonradiative recombination (NRR), or multiexciton generation (MEG) processes. Computed times of these processes fall in the order of MEG < EC < RR < NRR, where MEG is on the order of a few femtoseconds, EC is in the picosecond range, while RR and NRR are on the order of nanoseconds. Computed time scales indicate which electronic transition pathways can contribute to increase in charge collection efficiency. Simulated mechanisms of relaxation and their rates show that quantum confinement promotes MEG in MAPbI3 QDs.

Research Organization:
Univ. of California, Oakland, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; CHE-1413614; CHE-1460872
OSTI ID:
1366550
Alternate ID(s):
OSTI ID: 1372297
Journal Information:
Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Vol. 8 Journal Issue: 13; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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