DataVXACS Energy LettersPaper
journal article·2022-01-14Open access

Halide Mixing Inhibits Exciton Transport in Two-dimensional Perovskites Despite Phase Purity

Michael Seitz, Marc Meléndez, Peyton York, Daniel A. Kurtz, Alvaro J. Magdaleno, Nerea Alcázar-Cano, Anuraj S. Kshirsagar, Mahesh K. Gangishetty, Rafael Delgado-Buscalioni, Daniel N. Congreve, Ferry Prins

ACS Energy Letters· Volume 7· Issue 1
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Source abstract

Abstract

Halide mixing is one of the most powerful techniques to tune the optical bandgap of metal-halide perovskites. However, halide mixing has commonly been observed to result in phase segregation, which reduces excited-state transport and limits device performance. While the current emphasis lies on the development of strategies to prevent phase segregation, it remains unclear how halide mixing may affect excited-state transport even if phase purity is maintained. Here, we study exciton transport in phase pure mixed-halide 2D perovskites of (PEA) 2 Pb(I 1-x Br x ) 4 . Using transient photoluminescence microscopy, we show that, despite phase purity, halide mixing inhibits exciton transport. We find a significant reduction even for relatively low alloying concentrations. By performing Brownian dynamics simulations, we are able to reproduce our experimental results and attribute the decrease in diffusivity to the energetically disordered potential landscape that arises due to the intrinsic random distribution of alloying sites.
Source: openalex_inverted_index · Quality: baseline

Research context

Metals & alloysElectronic materials

OpenAlex topics: Perovskite Materials and Applications · Chalcogenide Semiconductor Thin Films · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Condensed Matter Physics Center (IFIMAC), Autonomous University of Madrid, 28049 Madrid, Spain

Department of Condensed Matter Physics, Autonomous University of Madrid, 28049 Madrid, Spain

Rowland Institute at Harvard University, Cambridge, Massachusetts 02142, United States

Department of Electrical Engineering, Stanford University, Stanford, California 94305, United States

Department of Theoretical Condensed Matter Physics, Autonomous University of Madrid, 28049 Madrid, Spain

Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States

Funding

Rowland Foundation · Rowland Institute at Harvard · Comunidad de Madrid · Ministerio de Ciencia, Innovaci??n y Universidades · Schweizerischer Nationalfonds zur F??rderung der Wissenschaftlichen Forschung · Office of Experimental Program to Stimulate Competitive Research · Ministerio de Econom??a y Competitividad · ???la Caixa??? Foundation · H2020 Marie Sk??odowska-Curie Actions · Department of Electrical Engineering, Stanford University

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