Mixed Valence of Bismuth in Hexagonal Chalcohalide Nanocrystals
Source abstract
Abstract
High Resolution Image Download MS PowerPoint Slide We report the colloidal synthesis of bismuth chalcohalide nanocrystals, which adopt a hexagonal phase that we describe with the Bi 13 S 18 X 2 (in which X = Br and I) structure. Such a model structure displays columns of Bi atoms that form dimers of subvalent Bi (formally Bi 2 4+ ), which we here ascribe to Peierls-type distortions. We suggest that the Bi 2 4+ dimers are at the origin of the anomalously low band gap of this material, with the lowest energy electronic transition showing analogies with an intervalence charge transfer. Our synthetic approach and insights into the structural and electronic features of the hexagonal bismuth chalcohalides are fundamental to sustain the rapidly increasing use of this class of (nano)materials for diverse applications, such as photocatalysis and thermoelectrics.
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Research context
OpenAlex topics: Crystal Structures and Properties · Advanced Thermoelectric Materials and Devices · X-ray Diffraction in Crystallography
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Consiglio Nazionale delle Ricerche, Istituto di Nanotecnologia − CNR NANOTEC, Via Monteroni, 73100Lecce, Italy
Istituto Italiano di Tecnologia − IIT, Via Morego 30, 16163Genova, Italy
International Doctoral Program in Science, Università Cattolica del Sacro Cuore, 25121Brescia, Italy
Consiglio Nazionale delle Ricerche, Istituto di Cristallografia − CNR IC, Via Amendola 122, 70126Bari, Italy
BCMaterials, Basque Center for Materials, Applications, and Nanostructures, UPV/EHU Science Park, Leioa48940, Spain
Ikerbasque, Basque Foundation for Science, Bilbao48009, Spain
Dipartimento di Fisica, Università del Salento, Via per Arnesano, 73100Lecce, Italy
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