Effect of Structural Phase Transition on Charge-Carrier Lifetimes and Defects in CH3NH3SnI3 Perovskite | Zendy

Elizabeth S. Parrott | Zendy; Rebecca L. Milot | Zendy; Θωμάς Στεργιόπουλος | Zendy; Henry J. Snaith | Zendy; Michael B. Johnston | Zendy; Laura M. Herz | Zendy

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Effect of Structural Phase Transition on Charge-Carrier Lifetimes and Defects in CH₃NH₃SnI₃ Perovskite

Author(s) -

Elizabeth S. Parrott,

Rebecca L. Milot,

Θωμάς Στεργιόπουλος,

Henry J. Snaith,

Michael B. Johnston,

Laura M. Herz

Publication year - 2016

Publication title -

the journal of physical chemistry letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.563

H-Index - 203

ISSN - 1948-7185

DOI - 10.1021/acs.jpclett.6b00322

Subject(s) - tetragonal crystal system , materials science , photoluminescence , orthorhombic crystal system , perovskite (structure) , dopant , band gap , triiodide , tin , phase transition , charge carrier , spectral line , analytical chemistry (journal) , condensed matter physics , optoelectronics , doping , crystallography , crystal structure , chemistry , metallurgy , physics , electrode , dye sensitized solar cell , electrolyte , astronomy , chromatography

Methylammonium tin triiodide (MASnI3) has been successfully employed in lead-free perovskite solar cells, but overall power-conversion efficiencies are still significantly lower than for lead-based perovskites. Here we present photoluminescence (PL) spectra and time-resolved PL from 8 to 295 K and find a marked improvement in carrier lifetime and a substantial reduction in PL line width below ∼110 K, indicating that the cause of the hindered performance is activated at the orthorhombic to tetragonal phase transition. Our measurements therefore suggest that targeted structural change may be capable of tailoring the relative energy level alignment of defects (e.g., tin vacancies) to reduce the background dopant density and improve charge extraction. In addition, we observe for the first time an above-gap emission feature that may arise from higher-lying interband transitions, raising the prospect of excess energy harvesting.

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