Förståelse och styrning av excitoner, laddningar och defekttillstånd i nya noll-, två- och tre-dimensionella vismutperovskiter för optoelektroniska tillämpningar

Tidsperiod: 2017-01-01 till 2020-12-31

Projektledare: Erik Johansson

Finansiär: Vetenskapsrådet

Bidragstyp: Projektbidrag

Budget: 3 400 000 SEK

Lead-halide perovskites have the recent years been developed for use in optoelectronic devices. In particular solar cells based on these perovskites have shown very high solar to electricity conversion efficiencies, and also lasers and photodetectors based on the lead-halide perovskites has shown very promising properties. However, one main concern with the lead-halide perovskites is the content of lead, which is toxic. We have last year discovered that a zero-dimensional bismuth-halide perovskite can replace the lead perovskite in solar cells with promising results. Bismuth is much less toxic than lead, and bismuth-halide perovskites may therefore be essential for the utilization of perovskitesin optoelectronic devices on a large scale.In this project we will investigate the fundamental properties of the bismuth perovskite and also prepare new bismuth perovskites with zero-, two, and three-dimensional character. We will perform advanced measurements and theoretical calculations to investigate; how light is absorbed in these materials, the properties and dynamics of the excited electron-hole pair (exciton), the conduction of charges, and the nature and effects of defect states.We will also perform measurements on devices with the bismuth perovskites, and specifically focus on solar cells. We can therefore link the fundamental properties to the application in devices, which will be of key importance for further development of these materials and devices.