Exploiting the lability of metal halide perovskites for doping semiconductor nanocomposites
Cesium lead halides have intrinsically unstable crystal lattices and easily transform within perovskite and nonperovskite structures. In this work, we explore the conversion of the perovskite CsPbBr into CsPbBr in the presence of PbS at 450 °C to produce doped nanocrystal-based composites with embed...
| Autores: | , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:237196 |
| Acceso en línea: | https://ddd.uab.cat/record/237196 https://dx.doi.org/urn:doi:10.1021/acsenergylett.0c02448 |
| Access Level: | acceso abierto |
| Palabra clave: | Nanocomposites Electrical conductivity Phase transitions Perovskites Doping |
| Sumario: | Cesium lead halides have intrinsically unstable crystal lattices and easily transform within perovskite and nonperovskite structures. In this work, we explore the conversion of the perovskite CsPbBr into CsPbBr in the presence of PbS at 450 °C to produce doped nanocrystal-based composites with embedded CsPbBr nanoprecipitates. We show that PbBr is extracted from CsPbBr and diffuses into the PbS lattice with a consequent increase in the concentration of free charge carriers. This new doping strategy enables the adjustment of the density of charge carriers between 10 19 and 10 20 cm -3, and it may serve as a general strategy for doping other nanocrystal-based semiconductors. |
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