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Issue 4, 2017
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Ultrafast carrier dynamics in bimetallic nanostructure-enhanced methylammonium lead bromide perovskites

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Abstract

In this work, 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.

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

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Publication details

The article was received on 24 Oct 2016, accepted on 09 Dec 2016 and first published on 14 Dec 2016


Article type: Paper
DOI: 10.1039/C6NR08347A
Citation: Nanoscale, 2017,9, 1475-1483
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    Ultrafast carrier dynamics in bimetallic nanostructure-enhanced methylammonium lead bromide perovskites

    H. F. Zarick, A. Boulesbaa, A. A. Puretzky, E. M. Talbert, Z. R. DeBra, N. Soetan, D. B. Geohegan and R. Bardhan, Nanoscale, 2017, 9, 1475
    DOI: 10.1039/C6NR08347A

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