Frenkel-like Wannier-Mott excitons in few-layer PbI2

Toulouse, Alexis S.; Isaacoff, Benjamin P.; Shi, Guangsha; Matuchová, Marie; Kioupakis, Emmanouil; Merlin, Roberto

doi:10.1103/PhysRevB.91.165308

Title: Frenkel-like Wannier-Mott excitons in few-layer $Pb I_{2}$

Journal Article · Wed Apr 15 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.91.165308· OSTI ID:1370080

Toulouse, Alexis S. ^[1]; Isaacoff, Benjamin P. ^[1]; Shi, Guangsha ^[1]; Matuchová, Marie ^[2]; Kioupakis, Emmanouil ^[1]; Merlin, Roberto ^[1]

Univ. of Michigan, Ann Arbor, MI (United States)
Inst. of Chemical Technology Prague (Czech Republic)

Optical measurements and first-principles calculations of the band structure and exciton states in direct-gap bulk and few-layer PbI₂ indicate that the n = 1 exciton is Frenkel-like in nature in that its energy exhibits a weak dependence on thickness down to atomic-length scales. Results reveal large increases in the gap and exciton binding energy with a decreasing number of layers and a transition of the fundamental gap, which becomes indirect for one and two monolayers. Calculated values are in reasonable agreement with a particle-in-a-box model relying on the Wannier-Mott theory of exciton formation. In conclusion, general arguments and existing data suggest that the Frenkel-like character of the lowest exciton is a universal feature of wide-gap layered semiconductors whose effective masses and dielectric constants give bulk Bohr radii that are on the order of the layer spacing.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Solar and Thermal Energy Conversion (CSTEC)

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

Grant/Contract Number:: SC0000957; AC02-05CH11231; DMR-1254314

OSTI ID:: 1370080

Alternate ID(s):: OSTI ID: 1178611

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 16; Related Information: CSTEC partners with University of Michigan (lead); Kent State University; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 58 works

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