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Title: Ultrafast carrier dynamics in bimetallic nanostructure-enhanced methylammonium lead bromide perovskites

In this paper, we examine the impact of hybrid bimetallic Au/Ag core/shell nanostructures on the carrier dynamics of methylammonium lead tribromide (MAPbBr 3) mesoporous perovskite solar cells (PSCs). Plasmon-enhanced PSCs incorporated with Au/Ag nanostructures demonstrated improved light harvesting and increased power conversion efficiency by 26% relative to reference devices. Two complementary spectral techniques, transient absorption spectroscopy (TAS) and time-resolved photoluminescence (trPL), were employed to gain a mechanistic understanding of plasmonic enhancement processes. TAS revealed a decrease in the photobleach formation time, which suggests that the nanostructures improve hot carrier thermalization to an equilibrium distribution, relieving hot phonon bottleneck in MAPbBr3 perovskites. TAS also showed a decrease in carrier decay lifetimes, indicating that nanostructures enhance photoinduced carrier generation and promote efficient electron injection into TiO 2 prior to bulk recombination. Furthermore, nanostructure-incorporated perovskite films demonstrated quenching in steady-state PL and decreases in trPL carrier lifetimes, providing further evidence of improved carrier injection in plasmon-enhanced mesoporous PSCs.
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1]
  1. Vanderbilt Univ., Nashville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Nanoscale
Additional Journal Information:
Journal Volume: 9; Journal Issue: 4; Journal ID: ISSN 2040-3364
Publisher:
Royal Society of Chemistry
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Ultrafast dynamics; Perovskites; Nanostructures
OSTI Identifier:
1350929

Zarick, Holly F., Boulesbaa, Abdelaziz, Puretzky, Alexander A., Talbert, Eric M., DeBra, Zachary R., Soetan, Naiya, Geohegan, David B., and Bardhan, Rizia. Ultrafast carrier dynamics in bimetallic nanostructure-enhanced methylammonium lead bromide perovskites. United States: N. p., Web. doi:10.1039/C6NR08347A.
Zarick, Holly F., Boulesbaa, Abdelaziz, Puretzky, Alexander A., Talbert, Eric M., DeBra, Zachary R., Soetan, Naiya, Geohegan, David B., & Bardhan, Rizia. Ultrafast carrier dynamics in bimetallic nanostructure-enhanced methylammonium lead bromide perovskites. United States. doi:10.1039/C6NR08347A.
Zarick, Holly F., Boulesbaa, Abdelaziz, Puretzky, Alexander A., Talbert, Eric M., DeBra, Zachary R., Soetan, Naiya, Geohegan, David B., and Bardhan, Rizia. 2016. "Ultrafast carrier dynamics in bimetallic nanostructure-enhanced methylammonium lead bromide perovskites". United States. doi:10.1039/C6NR08347A. https://www.osti.gov/servlets/purl/1350929.
@article{osti_1350929,
title = {Ultrafast carrier dynamics in bimetallic nanostructure-enhanced methylammonium lead bromide perovskites},
author = {Zarick, Holly F. and Boulesbaa, Abdelaziz and Puretzky, Alexander A. and Talbert, Eric M. and DeBra, Zachary R. and Soetan, Naiya and Geohegan, David B. and Bardhan, Rizia},
abstractNote = {In this paper, we examine the impact of hybrid bimetallic Au/Ag core/shell nanostructures on the carrier dynamics of methylammonium lead tribromide (MAPbBr3) mesoporous perovskite solar cells (PSCs). Plasmon-enhanced PSCs incorporated with Au/Ag nanostructures demonstrated improved light harvesting and increased power conversion efficiency by 26% relative to reference devices. Two complementary spectral techniques, transient absorption spectroscopy (TAS) and time-resolved photoluminescence (trPL), were employed to gain a mechanistic understanding of plasmonic enhancement processes. TAS revealed a decrease in the photobleach formation time, which suggests that the nanostructures improve hot carrier thermalization to an equilibrium distribution, relieving hot phonon bottleneck in MAPbBr3 perovskites. TAS also showed a decrease in carrier decay lifetimes, indicating that nanostructures enhance photoinduced carrier generation and promote efficient electron injection into TiO2 prior to bulk recombination. Furthermore, nanostructure-incorporated perovskite films demonstrated quenching in steady-state PL and decreases in trPL carrier lifetimes, providing further evidence of improved carrier injection in plasmon-enhanced mesoporous PSCs.},
doi = {10.1039/C6NR08347A},
journal = {Nanoscale},
number = 4,
volume = 9,
place = {United States},
year = {2016},
month = {12}
}

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