Type-I Energy Level Alignment at the PTCDA-Monolayer MoS₂ Interface Promotes Resonance Energy Transfer and Luminescence Enhancement.

ABSTRACT: Van der Waals heterostructures consisting of 2D semiconductors and conjugated molecules are of increasing interest because of the prospect of a synergistic enhancement of (opto)electronic properties. In particular, perylenetetracarboxylic dianhydride (PTCDA) on monolayer (ML)-MoS₂ has been identified as promising candidate and a staggered type-II energy level alignment and excited state interfacial charge transfer have been proposed. In contrast, it is here found with inverse and direct angle resolved photoelectron spectroscopy that PTCDA/ML-MoS₂ supported by insulating sapphire exhibits a straddling type-I level alignment, with PTCDA having the wider energy gap. Photoluminescence (PL) and sub-picosecond transient absorption measurements reveal that resonance energy t

SUBMITTER: Park S 

PROVIDER: S-EPMC8224443 | biostudies-literature | 2021 Jun

REPOSITORIES: biostudies-literature