Journal article
Slow Electron-Hole Recombination in Lead Iodide Perovskites Does Not Require a Molecular Dipole
ACS energy letters, v 2(10), pp 2239-2244
01 Oct 2017
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Hybrid organic/inorganic lead iodide perovskites of the formula APbI(3), where A is a molecular cation such as methylammonium, exhibit remarkably slow photoinduced charge carrier recombination rates, for reasons that remain uncertain. Prevalent hypotheses credit this behavior to the unique dipolar nature of the molecular cation. Herein, transient terahertz spectroscopy is applied to solution-processed, all-inorganic, perovskite-phase cesium lead iodide (CsPbl(3)) thin films, which lack such a dipole. The recombination kinetics are studied as a function of the initial photoinduced carrier concentration and the wavelength of excitation. A kinetic model combining diffusion and recombination is fit to the data, from which the rate constants are determined, revealing a bimolecular recombination rate of 10(-10) cm(3) comparable to high-quality, single-crystal, direct-gap semiconductors. This rate, as well as a charge carrier mobility > 30 cm(2) V-1 s(-1) measured herein for CsPbI3, are similar to values reported for the hybrid perovskites, strongly suggesting that the organic cation does not confer a fundamental advantage.
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Details
- Title
- Slow Electron-Hole Recombination in Lead Iodide Perovskites Does Not Require a Molecular Dipole
- Creators
- Subham Dastidar - Drexel UniversitySiming Li - Drexel UniversitySergey Y. Smolin - Drexel UniversityJason B. Baxter - Drexel UniversityAaron T. Fafarman - Drexel University
- Publication Details
- ACS energy letters, v 2(10), pp 2239-2244
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 6
- Grant note
- 1507988 / Direct For Mathematical & Physical Scien; National Science Foundation (NSF); NSF - Directorate for Mathematical & Physical Sciences (MPS) CBET-1604293; DMR-1507988 / NSF; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000415914200006
- Scopus ID
- 2-s2.0-85031290587
- Other Identifier
- 991019168843104721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Physical
- Electrochemistry
- Energy & Fuels
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology