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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 3, Iss. 9 — Sep. 1, 2013
  • pp: 1420–1427

NIR and UV enhanced photon detector made by diindium trichalcogenides

Ching-Hwa Ho and Yi-Ping Wang  »View Author Affiliations

Optical Materials Express, Vol. 3, Issue 9, pp. 1420-1427 (2013)

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III-VI compounds In2S3 and In2Se3 are potential optical-absorption materials used for solar energy conversion and photon detection applications. The natural surface oxide and intrinsic chalcogen vacancies in In2X3 (X = S, Se) facilitate photoelectric conversion in near infrared (NIR) to ultraviolet (UV) region. In this work, In2S3 and In2Se3 crystals have been grown by chemical vapor transport method using ICl3 as a transport agent. The as-grown In2S3 presents β phase with a tetragonal lattice (β-In2S3) while In2Se3 reveals a hexagonal layer structure of α phase (α-In2Se3). The band-edge property of β-In2S3 and α-In2Se3 has been evaluated by transmittance and thermoreflectance spectroscopy. The direct band gaps have been determined to be Eg = 1.935 eV for β-In2S3, and Eg = 1.453 eV for α-In2Se3, respectively. The optoelectronic and photoelectric conversion properties of III-VI In2S3 and In2Se3 are examined by surface photovoltage, surface photoconductive response, photoluminescence, and photoconductivity measurements. The experimental evaluations show In2X3 a well-functional material in photoelectric conversion and photodetection from near IR to UV region with the auxiliary of intrinsic defects and surface formation oxides existed in the chalcogenides.

© 2013 OSA

OCIS Codes
(040.5150) Detectors : Photoconductivity
(040.5160) Detectors : Photodetectors
(160.4760) Materials : Optical properties
(160.6000) Materials : Semiconductor materials

ToC Category:

Original Manuscript: July 9, 2013
Revised Manuscript: August 11, 2013
Manuscript Accepted: August 11, 2013
Published: August 21, 2013

Ching-Hwa Ho and Yi-Ping Wang, "NIR and UV enhanced photon detector made by diindium trichalcogenides," Opt. Mater. Express 3, 1420-1427 (2013)

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