Nanoscale Periodic Trapping Sites for Interlayer Excitons Built by Deformable Molecular Crystal on 2D Crystal

Rijal, Kushal; Amos, Stephanie; Valencia-Acuna, Pavel; Rudayni, Fatimah; Fuller, Neno; Zhao, Hui; Peelaers, Hartwin; Chan, Wai-Lun

doi:10.1021/acsnano.3c00541

Title: Nanoscale Periodic Trapping Sites for Interlayer Excitons Built by Deformable Molecular Crystal on 2D Crystal

Journal Article · Wed Apr 12 00:00:00 EDT 2023 · ACS Nano

DOI:https://doi.org/10.1021/acsnano.3c00541· OSTI ID:2242505

^[1]; Amos, Stephanie ^[1]; Valencia-Acuna, Pavel ^[1]; Rudayni, Fatimah ^[2]; Fuller, Neno ^[1];

^[1];

^[1]

University of Kansas, Lawrence, KS (United States)
University of Kansas, Lawrence, KS (United States); Jazan University (Saudi Arabia)

The nanoscale moiré pattern formed at 2D transition-metal dichalcogenide crystal (TMDC) heterostructures provides periodic trapping sites for excitons, which is essential for realizing various exotic phases such as artificial exciton lattices, Bose–Einstein condensates, and exciton insulators. At organic molecule/TMDC heterostructures, similar periodic potentials can be formed via other degrees of freedom. Here, we utilize the structure deformability of a 2D molecular crystal as a degree of freedom to create a periodic nanoscale potential that can trap interlayer excitons (IXs). Specifically, two semiconducting molecules, PTCDI and PTCDA, which possess similar band gaps and ionization potentials but form different lattice structures on MoS₂, are investigated. The PTCDI lattice on MoS₂ is distorted geometrically, which lifts the degeneracy of the two molecules within the crystal’s unit cell. The degeneracy lifting results in a spatial variation of the molecular orbital energy, with an amplitude and periodicity of ~0.2 eV and ~2 nm, respectively. On the other hand, no such energy variation is observed in PTCDA/MoS₂, where the PTCDA lattice is much less distorted. Furthermore, the periodic variation in molecular orbital energies provides effective trapping sites for IXs. For IXs formed at PTCDI/MoS₂, rapid spatial localization of the electron in the organic layer toward the interface is observed, which demonstrates the effectiveness of these interfacial IX traps.

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Research Organization:: Univ. of Kansas, Lawrence, KS (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: SC0020995; DMR-2109979

OSTI ID:: 2242505

Journal Information:: ACS Nano, Vol. 17, Issue 8; ISSN 1936-0851

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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77 NANOSCIENCE AND NANOTECHNOLOGY
interlayer exciton
two-dimensional materials
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layers
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Title: Nanoscale Periodic Trapping Sites for Interlayer Excitons Built by Deformable Molecular Crystal on 2D Crystal

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