Open Access System for Information Sharing

Login Library

 

Article
Cited 3 time in webofscience Cited 3 time in scopus
Metadata Downloads

Polaronic Charge Carrier-Lattice Interactions in Lead Halide Perovskites

Title
Polaronic Charge Carrier-Lattice Interactions in Lead Halide Perovskites
Authors
Wolf, ChristophCho, HimchanKim, Young-HoonLee, Tae-Woo
POSTECH Authors
Lee, Tae-Woo
Date Issued
Oct-2017
Publisher
WILEY-V C H VERLAG GMBH
Abstract
Almost ten years after the renaissance of the popular perovskite-type semiconductors based on lead salts with the general formula AMX(3) (A=organic or inorganic cation; M=divalent metal; X=halide), many facets of photophysics continue to puzzle researchers. In this Minireview, light is shed on the low mobilities of charge carriers in lead halide perovskites with special focus on the lattice properties at non-zero temperature. The polar and soft lattice leads to pronounced electron-phonon coupling, limiting carrier mobility and retarding recombination. We propose that the proper picture of excited charge carriers at temperature ranges that are relevant for device operations is that of a polaron, with Frohlich coupling constants between 1<a<3. Under the aspect of light-emitting diode application, APbX(3) perovskite show moderate second order (bimolecular) recombination rates and high third-order (Auger) rate constants. It has become apparent that this is a direct consequence of the anisotropic polar A-site cation in organic-inorganic hybrid perovskites and might be alleviated by replacing the organic moiety with an isotropic cation.
Almost ten years after the renaissance of the popular perovskite-type semiconductors based on lead salts with the general formula AMX(3) (A=organic or inorganic cation; M=divalent metal; X=halide), many facets of photophysics continue to puzzle researchers. In this Minireview, light is shed on the low mobilities of charge carriers in lead halide perovskites with special focus on the lattice properties at non-zero temperature. The polar and soft lattice leads to pronounced electron-phonon coupling, limiting carrier mobility and retarding recombination. We propose that the proper picture of excited charge carriers at temperature ranges that are relevant for device operations is that of a polaron, with Frohlich coupling constants between 1<a<3. Under the aspect of light-emitting diode application, APbX(3) perovskite show moderate second order (bimolecular) recombination rates and high third-order (Auger) rate constants. It has become apparent that this is a direct consequence of the anisotropic polar A-site cation in organic-inorganic hybrid perovskites and might be alleviated by replacing the organic moiety with an isotropic cation.
Keywords
LIGHT-EMITTING-DIODES; ORGANIC-INORGANIC PEROVSKITES; EXCITON BINDING-ENERGY; SINGLE-CRYSTAL CH3NH3PBI3; SOLAR-CELLS; LAYERED-PEROVSKITE; OPTICAL-PROPERTIES; RADIATIVE RECOMBINATION; ELECTRONIC-PROPERTIES; HYBRID PEROVSKITES
URI
http://oasis.postech.ac.kr/handle/2014.oak/51050
DOI
10.1002/cssc.201701284
ISSN
1864-5631
Article Type
Article
Citation
ChemSusChem, vol. 10, no. 19, page. 3705 - 3711, 2017-10
Files in This Item:
There are no files associated with this item.

qr_code

  • mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Related Researcher

Researcher

 LEE, TAE WOO
Dept of Materials Science & Enginrg
Read more

Views & Downloads

Browse