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ACS Nano. 2019 Nov 26;13(11):13390-13402. doi: 10.1021/acsnano.9b06782. Epub 2019 Nov 4.

Surface-State Assisted Carrier Recombination and Optical Nonlinearities in Bulk to 2D Nonlayered PtS.

Huang J1,2,3, Dong N1,2,3, McEvoy N4, Wang L1,2,3, Coileáin CÓ4, Wang H1,2,3, Cullen CP4, Chen C1,2,3, Zhang S1,2,3, Zhang L1,2,3, Wang J1,2,3,5.

Author information

1
Laboratory of Micro-Nano Optoelectronic Materials and Devices, Key Laboratory of Materials for High-Power Laser , Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences , Shanghai 201800 , China.
2
Center of Materials Science and Optoelectronics Engineering , University of Chinese Academy of Sciences , Beijing 100049 , China.
3
CAS Center for Excellence in Ultra-intense Laser Science , Shanghai 201800 , China.
4
Advanced Materials and BioEngineering Research (AMBER) Centre and School of Chemistry , Trinity College Dublin , Dublin 2 , Ireland.
5
State Key Laboratory of High Field Laser Physics , Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences , Shanghai 201800 , China.

Abstract

Cooperite, or platinum sulfide (PtS), is a rare mineral that generally exists as microscale, irregularly shaped crystallites. The presence of impurities, in both naturally occurring and synthesized samples, has hindered the study of its optical properties in the past. In this work, we prepare large-scale, uniform PtS films in bulk to two-dimensional form through the thermally assisted conversion method. An abnormal trend is observed in linear spectral studies whereby the optical bandgap narrows as the film thickness decreases. A model based on the continuous distribution of carriers in real space, which can be regarded as a quantum well normal to the plane, is used to describe the thickness-dependent carrier recombination phenomenon. In the nonlinear optical measurements, PtS exhibits ultrafast saturable absorption and self-defocusing properties in the visible region, which are dominated by the resonant electronic nonlinearities.

KEYWORDS:

carrier dynamics; optical nonlinearities; platinum sulfide; surface states; two-dimensional nonlayered materials

PMID:
31661247
DOI:
10.1021/acsnano.9b06782

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