DataVXACS Energy LettersPaper
journal article·2019-08-09Open access

Enhanced Open-Circuit Voltage of Wide-Bandgap Perovskite Photovoltaics by Using Alloyed (FA1–xCsx)Pb(I1–xBrx)3 Quantum Dots

Mokshin Suri, Abhijit Hazarika, Bryon W. Larson, Qian Zhao, Marta Vallés-Pelarda, Timothy D. Siegler, Michael K. Abney, Andrew J. Ferguson, Brian A. Korgel, Joseph M. Luther

ACS Energy Letters· Volume 4· Issue 8
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Source abstract

Abstract

We report a detailed study on APbX3 (A = formamidinium (FA+), Cs+; X = I–, Br–) perovskite quantum dots (PQDs) with combined A- and X-site alloying that exhibits both a wide bandgap and high open-circuit voltage (Voc) for the application of a potential top cell in tandem junction photovoltaic (PV) devices. The nanocrystal alloying affords control over the optical bandgap and is readily achieved by solution-phase cation and anion exchange between previously synthesized FAPbI3 and CsPbBr3 PQDs. Increasing only the Br– content of the PQDs widens the bandgap but results in shorter carrier lifetimes and associated Voc losses in devices. These deleterious effects can be mitigated by replacing Cs+ with FA+, resulting in wide-bandgap PQD absorbers with improved charge-carrier mobility and PVs with higher Voc. Although further device optimization is required, these results demonstrate the potential of FA1–xCsxPb(I1–xBrx)3 PQDs for wide-bandgap perovskite PVs with high Voc.
Source: openalex_inverted_index · Quality: baseline

Research context

Metals & alloysNanomaterialsElectronic materials

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Solid-state spectroscopy and crystallography

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

Affiliations

National Renewable Energy Laboratory, Golden, Colorado 80401, United States

McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712-1062, United States

College of Chemistry, Nankai University, Tianjin 300071, China

Institute of Advanced Materials (INAM), Universitat Jaume I, Avenida de Vicent Sos Baynat, s/n, 12006 Castelló de la Plana, Castellón, Spain

Funding

Welch Foundation · Universitat Jaume I · Air Force Office of Scientific Research · Workforce Development for Teachers and Scientists · National Renewable Energy Laboratory · China Scholarship Council · National Natural Science Foundation of China · National Science Foundation

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