Format:
1 Online-Ressource (8 Seiten)
Content:
To fully unlock the potential of metal halide perovskites (MHPs) for use in optoelectronic devices, a comprehensive understanding of their electronic properties is in strong demand but presently lacking. This photoelectron spectroscopy study reveals that the thin films of three important mixed-cation/mixed-halide MHPs behave like intrinsic semiconductors with a very low defect concentration. The Fermi level position in the bandgap can be varied by almost 1 eV by choosing substrates of appropriate work function for samples that were handled under inert conditions. Upon oxygen exposure, two organic/inorganic-cation MHPs become strongly p-doped due to oxygen diffusion into the bulk, a process that is fully reversible when storing the samples in ultrahigh vacuum. In contrast, all-inorganic CsPbI1.8Br1.2 exhibits no electronic property changes upon oxygen exposure. Nonetheless, oxygen is found to effectively remove (light-induced) lead-related surface states of CsPbI1.8Br1.2.
Content:
Peer Reviewed
Note:
This study was supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation, Grant Nos. 182087777-SFB951 and 423749265-SPP2196 "SURPRISE").
In:
APL materials : high impact open access journal in functional materials science, Melville, NY : AIP Publ., 9,2021,8, Seiten 9, 081104-9, 081104-7
Language:
English
URN:
urn:nbn:de:kobv:11-110-18452/25068-9
URL:
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