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

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

ACS Nano

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.

Published: November 2019

AI Article Synopsis

  • Cooperite (PtS) is a rare mineral with irregular crystallite shapes, and its study has been challenging due to impurities in samples.
  • The researchers developed large, uniform PtS films using a thermally assisted conversion method, which revealed that the optical bandgap narrows as the film thickness decreases.
  • Nonlinear optical tests showed that PtS has ultrafast saturable absorption and self-defocusing properties in the visible range, largely influenced by resonant electronic effects.

Article 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.

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Source
http://dx.doi.org/10.1021/acsnano.9b06782DOI Listing

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