DataVXACS Energy LettersPaper
journal article·2023-09-08Open access

How Halide Alloying Influences the Optoelectronic Quality in Tin-Halide Perovskite Solar Absorbers

Felix J. Berger, Isabella Poli, Ece Aktas, Samuele Martani, Daniele Meggiolaro, Luca Gregori, Munirah D. Albaqami, Antonio Abate, Filippo De Angelis, Annamaria Petrozza

ACS Energy Letters· Volume 8· Issue 9
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Source abstract

Abstract

Halide alloying in tin-based perovskites allows for photostable bandgap tuning between 1.3 and 2.2 eV. Here, we elucidate how the band edge energetics and associated defect activity impact the optoelectronic properties of this class of materials. We find that by increasing the bromide:iodide ratio, a simultaneous destabilization of acceptor defects (tin vacancies and iodine interstitials) and stabilization of donor defects (iodine vacancies and tin interstitials) occurs, with strong changes arising for Br contents exceeding 50%. This translates into a decreased doping which is, however, accompanied by a higher density of nonradiative recombination channels. Films with high Br content show a high degree of disorder and trap state densities, with the best optoelectronic quality being found for Br contents of around 33%. These observations match the open circuit voltage trend of tin-based mixed halide perovskite solar cells, supporting the relevance of optoelectronic properties and chemistry of defects to optimize wide-bandgap tin perovskite devices.
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

Center for Nano Science and Technology @PoliMi, Istituto Italiano di Tecnologia, via Rubattino 81, 20134 Milano, Italy

Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Piazzale Vincenzo Tecchio 80, 80125 Napoli, Italy

Physics Department, Politecnico di Milano, Piazza L. da Vinci, 32, 20133 Milano, Italy

Computational Laboratory for Hybrid/Organic Photovoltaics (CLHYO), Istituto CNR di Scienze e Tecnologie Chimiche “Giulio Natta” (CNR-SCITEC), 06123 Perugia, Italy

Department of Chemistry, Biology and Biotechnology, University of Perugia, 06123 Perugia, Italy

Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia

SKKU Institute of Energy Science and Technology (SIEST) Sungkyunkwan University, Suwon 440-746, Republic of Korea

Funding

H2020 Marie Sklodowska-Curie Actions · King Saud University · H2020 European Research Council

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