Correlation between Photoluminescence and Carrier Transport and a Simple In Situ Passivation Method for High-Bandgap Hybrid Perovskites

Stoddard, Ryan J.; Eickemeyer, Felix T.; Katahara, John K.; Hillhouse, Hugh W.

doi:10.1021/acs.jpclett.7b01185

Title: Correlation between Photoluminescence and Carrier Transport and a Simple In Situ Passivation Method for High-Bandgap Hybrid Perovskites

Journal Article · Wed Jun 21 00:00:00 EDT 2017 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.7b01185· OSTI ID:1368596

^[1]; Eickemeyer, Felix T. ^[1]; Katahara, John K. ^[1]; Hillhouse, Hugh W. ^[1]

Department of Chemical Engineering, Clean Energy Institute, and Molecular Engineering &, Sciences Institute, University of Washington, Seattle, Washington 98105, United States

High-bandgap mixed-halide hybrid perovskites have higher open-circuit voltage deficits and lower carrier diffusion lengths than their lower-bandgap counterparts. We have developed a ligand-assisted crystallization (LAC) technique that introduces additives in situ during the solvent wash and developed a new method to dynamically measure the absolute intensity steady-state photoluminescence and the mean carrier diffusion length simultaneously. The measurements reveal four distinct regimes of material changes and show that photoluminescence brightening often coincides with losses in carrier transport, such as in degradation or phase segregation. Further, the measurements enabled optimization of LAC on the 1.75 eV bandgap FA_0.83Cs_0.17Pb(I_0.66Br_0.34)₃, resulting in an enhancement of the photoluminescence quantum yield (PLQY) of over an order of magnitude, an increase of 80 meV in the quasi-Fermi level splitting (to 1.29 eV), an increase in diffusion length by a factor of 3.5 (to over 1 μm), and enhanced open-circuit voltage and short-circuit current from photovoltaics fabricated from the LAC-treated films.

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Research Organization:: Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; Washington Research Foundation (United States); State of Washington (United States)

Grant/Contract Number:: EE0006710

OSTI ID:: 1368596

Alternate ID(s):: OSTI ID: 1372315; OSTI ID: 1421371

Journal Information:: Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Vol. 8; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 42 works

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