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

Zarick, Holly F.; Boulesbaa, Abdelaziz; Puretzky, Alexander A.; Talbert, Eric M.; DeBra, Zachary R.; Soetan, Naiya; Geohegan, David B.; Bardhan, Rizia

doi:10.1039/C6NR08347A

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

Journal Article · Wed Dec 14 00:00:00 EST 2016 · Nanoscale

DOI:https://doi.org/10.1039/C6NR08347A· OSTI ID:1350929

Zarick, Holly F. ^[1]; Boulesbaa, Abdelaziz ^[2]; Puretzky, Alexander A. ^[2]; Talbert, Eric M. ^[1]; DeBra, Zachary R. ^[1]; Soetan, Naiya ^[1]; Geohegan, David B. ^[2]; Bardhan, Rizia ^[1]

Vanderbilt Univ., Nashville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1350929

Journal Information:: Nanoscale, Vol. 9, Issue 4; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 36 works

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