Competing Self-Trapped Exciton States and Multiple Emission Pathways in BiVO4
Artikel i vetenskaplig tidskrift, 2025

Transition metal oxides, such as BiVO4, have attracted significant attention for their potential in photoelectrochemical water-splitting. BiVO4, a model material in this area, is prone to charge localization in the form of small polarons. Recently, self-trapped excitons (STEs) in BiVO4 have been experimentally observed, but their precise nature remains elusive. In this study, we employ time-dependent density functional theory (TD-DFT) with a nonempirical PBE0(α) hybrid functional to investigate the localization, stability, and optical properties of STEs in BiVO4. Our results reveal two distinct localized exciton configurations with comparable energies. We show that the emission from a single STE configuration leads to multiple peaks in the emission spectrum, originating from different types of internal transitions. The positions of peaks in the calculated optical spectra are in good agreement with experimental observations.

Författare

Tobias Möslinger

Chalmers, Fysik, Kondenserad materie- och materialteori

Nicklas Österbacka

Chalmers, Fysik, Kondenserad materie- och materialteori

Julia Wiktor

Chalmers, Fysik, Kondenserad materie- och materialteori

Journal of Physical Chemistry Letters

1948-7185 (eISSN)

Vol. 16 6861-6865

Kvantmekanisk Beskrivning av Fullständiga Halvledaranordning

Stiftelsen för Strategisk forskning (SSF) (FFL21-0129), 2022-08-01 -- 2027-12-31.

Atomistisk design av fotoadsorberande material

Vetenskapsrådet (VR) (2019-03993), 2020-01-01 -- 2023-12-31.

Harnessing Localized Charges for Advancing Polar Materials Engineering (POLARISE)

Europeiska kommissionen (EU) (EC/HE/101162195), 2025-01-01 -- 2029-12-31.

Ämneskategorier (SSIF 2025)

Materialkemi

Den kondenserade materiens fysik

Annan fysik

DOI

10.1021/acs.jpclett.5c01215

PubMed

40569079

Mer information

Senast uppdaterat

2025-07-15