SbSeI and SbSeBr micro-columnar solar cells by a novel high pressure-based synthesis process
PublisherRoyal Society of Chemistry (RSC)
Rights accessOpen Access
ProjectDESARROLLO DE COMPUESTOS MIXTOS CALCOGENUROS-HALUROS DE BAJA DIMENSION POR RUTAS FISICAS PARA APLICACIONES EN DISPOSITIVOS FOTOVOLTAICOS TANDEM (AEI-PID2020-116719RB-C41)
Van der Waals chalcogenides and chalcohalides have the potential to become the next thin film PV breakthrough, owing to the earth-abundancy and non-toxicity of their components, and their stability, high absorption coefficient and quasi-1D structure, which leads to enhanced electrical anisotropic properties when the material is oriented in a specific crystalline direction. However, quasi-1D semiconductors beyond Sb2(S,Se)3, such as SbSeX chalcohalides, have been scarcely investigated for energy generation applications, and rarely synthesised by physical vapor deposition methodologies, despite holding the promise of widening the bandgap range (opening the door to tandem or semi-transparent devices), and showing enticing new properties such as ferroelectric behaviour and defect-tolerant nature. In this work, SbSeI and SbSeBr micro-columnar solar cells have been obtained for the first time by an innovative methodology based on the selective halogenation of Sb2Se3 thin films at pressure above 1 atm. It is shown that by increasing the annealing temperature and pressure, the height and density of the micro-columnar structures grows monotonically, resulting in SbSeI single-crystal columns up to 30 µm, and tuneable morphology. In addition, solar cell prototypes with substrate configuration have shown remarkable Voc values above 550 mV and 1.8 eV bandgap.
CitationIvan Caño Prades [et al.]. SbSeI and SbSeBr micro-columnar solar cells by a novel high pressure-based synthesis process. "Journal of materials chemistry. A", 17 Juliol 2023, vol. 11, p. 17616-17627.