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Title: Highly mobile excitons in single crystal methylammonium lead tribromide perovskite microribbons
Authors: McClintock, Luke
Song, Ziyi
Travaglini, H. Clark
Senger, Ramazan Tuğrul
Chandrasekaran, Vigneshwaran
Htoon, Han
Yarotski, Dmitry
Yu, Dong
University of California, Davis
University of California, Davis
University of California, Davis
01. Izmir Institute of Technology
Los Alamos National Laboratory
Los Alamos National Laboratory
Los Alamos National Laboratory
University of California, Davis
Keywords: Perovskites
Solar energy
Issue Date: Apr-2022
Publisher: American Chemical Society
Abstract: Excitons are often given negative connotation in solar energy harvesting in part due to their presumed short diffusion lengths. We investigate exciton transport in single-crystal methylammonium lead tribromide (MAPbBr3) microribbons via spectrally, spatially, and temporally resolved photocurrent and photoluminescence measurements. Distinct peaks in the photocurrent spectra unambiguously confirm exciton formation and allow for accurate extraction of the low temperature exciton binding energy (39 meV). Photocurrent decays within a few μm at room temperature, while a gate-tunable long-range photocurrent component appears at lower temperatures (about 100 μm below 140 K). Carrier lifetimes of 1.2 μs or shorter exclude the possibility of the long decay length arising from slow trapped-carrier hopping. Free carrier diffusion is also an unlikely source of the highly nonlocal photocurrent, due to their small fraction at low temperatures. We attribute the long-distance transport to high-mobility excitons, which may open up new opportunities for novel exciton-based photovoltaic applications.
Appears in Collections:Physics / Fizik
PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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