Publication: Polaron transport in hybrid CH3NH3PbI3perovskite thin films
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Issued Date
2020
Resource Type
File Type
application/pdf
ISSN
20403364
Other identifier(s)
2-s2.0-85088486636
Rights Holder(s)
Scopus
Bibliographic Citation
Nanoscale. Vol 12, No.26 (2020), p.14112-14119
Suggested Citation
Thongnum A., Pinsook U. Polaron transport in hybrid CH3NH3PbI3perovskite thin films. Nanoscale. Vol 12, No.26 (2020), p.14112-14119. doi:10.1039/d0nr03432k Retrieved from: https://hdl.handle.net/20.500.14740/4475
Author(s)
Abstract
A comprehensive study of the transport properties of a prototypical CH3NH3PbI3 thin film is presented. The polaron-longitudinal optical (LO) phonon scattering mechanism, based on Low-Pines's polaron mobility, was studied to elucidate the charge-carrier mobility. We found that the calculated mobilities showed very good quantitative agreement with the experimental data measured in thin film samples using photoconductivity techniques. In THz mobility, the calculated results yielded room-temperature (RT) mobilities of ~650 cm2 V-1 s-1 (single crystal) and ~220 cm2 V-1 s-1 (disordered thin film) at a low quantum yield (?) and 32 cm2 V-1 s-1 (high-quality thin film) at ? = 1. The dynamic disorder due to organic reorientation was included in the calculations. Its effect provided a power law mobility of µ ? Tm and satisfactorily supported temperature-dependent mobility over the temperature range of 80-370 K. In the orthorhombic and tetragonal phases, the charge-carrier mobilities with dynamic disorder were approximately 47% and 22% lower than those obtained from phases without dynamic disorder. The RT mobility was 26 cm2 V-1 s-1 at ? = 1. In the low-temperature orthorhombic phase, the structural phase transition was considered. The mobility followed a power law with m = -1.7. In the tetragonal and cubic phases, the mobility also followed a power law, but with m = -1.1, which is an intermediate range in optical phonon scattering. When combined with recent theoretical analysis, we also found three limitations of power law mobility with exponents between -0.46 and -1.1 for polaron-LO phonon scattering, -1.2 and -1.6 for bare carrier-LO phonon scattering, and -1.7 and -2.0 for carrier scattering off optical phonons and lattice fluctuations. This work not only provides a description of temperature-dependent mobility in CH3NH3PbI3 thin films, but also gives new insights into THz photoconductivity and the relationship between LO phonon scattering and power law mobility. © 2020 The Royal Society of Chemistry.
Subject(s)
Hall mobility
Hole mobility
Optical lattices
Phonon scattering
Phonons
Photoconductivity
Polarons
Single crystals
Temperature
Disordered thin films
Lattice fluctuations
Longitudinal optical phonons
Optical phonon scattering
Orthorhombic phase
Quantitative agreement
Structural phase transition
Temperature dependent
Thin films
Article
Calculation
Crystal
Low temperature
Phase transition
Phonon
Quantitative analysis
Quantum yield
Room temperature
Hole mobility
Optical lattices
Phonon scattering
Phonons
Photoconductivity
Polarons
Single crystals
Temperature
Disordered thin films
Lattice fluctuations
Longitudinal optical phonons
Optical phonon scattering
Orthorhombic phase
Quantitative agreement
Structural phase transition
Temperature dependent
Thin films
Article
Calculation
Crystal
Low temperature
Phase transition
Phonon
Quantitative analysis
Quantum yield
Room temperature