DOI: 10.1063/1.4750982. Investigation of defect levels in Cs2Hg6S7 single crystals by photoconductivity and photoluminescence spectroscopies

Investigation of defect levels in Cs2Hg6S7 single crystals by photoconductivity and photoluminescence spectroscopies

10.1063/1.4750982

Crossref journal-article

AIP Publishing

Journal of Applied Physics (317)

Abstract

The heavy element semiconductor compound Cs2Hg6S7 is of interest as a potential wide gap semiconductor for gamma ray detection. To determine electrically active defects and their energy levels, photoconductivity (PC) spectroscopy was carried out over the temperature range of 90-295 K. The low temperature spectrum exhibits photoconductive transitions at 1.495, 1.61, 1.66, and 1.68 eV. The optical transitions are tentatively attributed to defects with levels located at energies of 50, 70, 120, and 240 meV from the band edge. A superlinear dependence of photocurrent on illumination intensity is observed that is attributed to a two-center recombination process that involves shallow traps and recombination centers. Near band edge photoluminescence (PL) was observed over the temperature range of 24–80 K. The spectrum revealed three defect related emission bands located at 1.68, 1.66, and 1.62 eV, whose ionization energies are 57 meV, 78 meV, and 115 meV, respectively. From the temperature and excitation dependencies of the observed peak intensities and energies, the radiative recombination mechanisms of the bands were attributed to transitions involving excitons bound to neutral and ionized acceptors. Good agreement of the defect level energies determined by PL and PC were noted, indicating that they were of the same origin. The defects were tentatively attributed to metal vacancies that form shallow acceptor levels.

Bibliography

Peters, J. A., Cho, N. K., Liu, Z., Wessels, B. W., Li, H., Androulakis, J., & Kanatzidis, M. G. (2012). Investigation of defect levels in Cs2Hg6S7 single crystals by photoconductivity and photoluminescence spectroscopies. Journal of Applied Physics, 112(6).

Authors 7

J. A. Peters (first)
Nam Ki Cho (additional)
Zhifu Liu (additional)
B. W. Wessels (additional)
Hao Li (additional)
J. Androulakis (additional)
M. G. Kanatzidis (additional)

References 27 Referenced 13

10.1016/j.nima.2004.05.071 / Nucl. Instrum. Methods Phys. Res. (2004)
10.1021/ja9713486 / J. Amer. Chem. Soc. (1998)
10.1002/adma.201102450 / Adv. Mater. (2011)
10.1021/cg300385s / Cryst. Growth Des. (2012)
10.1557/opl.2011.1273 / Mater. Res. Symp. Proc. (2011)
10.1021/cm00008a006 / Chem. Mater. (1990)
10.1557/opl.2011.1482 / Mater. Res. Symp. Proc. (2011)
10.1103/PhysRevB.31.4074 / Phys. Rev. B (1985)
10.1063/1.2382668 / J. Appl. Phys. (2006)
10.1143/JPSJ.22.770 / J. Phy. Soc. Jpn. (1967)
{'volume-title': 'Electronic Properties of Crystalline Solids', 'year': '1974', 'key': '2023072705464902500_c8'} / Electronic Properties of Crystalline Solids (1974)
10.1063/1.325636 / J. Appl. Phys. (1979)
10.1103/PhysRev.150.619 / Phys. Rev. (1966)
{'year': '2012', 'key': '2023072705464902500_c11', 'article-title': 'First-principles study of γ-ray detectors: Cs-based compounds'} / First-principles study of γ-ray detectors: Cs-based compounds (2012)
{'first-page': '59', 'volume-title': 'Photoelectronic Properties of Semiconductors', 'year': '1992', 'key': '2023072705464902500_c12'} / Photoelectronic Properties of Semiconductors (1992)
10.1088/0953-8984/21/11/115801 / J. Phys.: Condens. Matter (2009)
10.1088/0953-8984/18/19/014 / J. Phys.: Condens. Matter (2006)
{'key': '2023072705464902500_c15', 'first-page': '29', 'volume': '6', 'year': '2009', 'journal-title': 'Chalcogenide Lett.'} / Chalcogenide Lett. (2009)
10.1016/j.jallcom.2006.04.010 / J. Alloys Compd. (2007)
{'volume-title': 'The Theory of Quantum Liquids', 'year': '1966', 'key': '2023072705464902500_c17'} / The Theory of Quantum Liquids (1966)
{'first-page': '342', 'volume-title': 'Photoconductivity of Solids', 'year': '1978', 'key': '2023072705464902500_c18'} / Photoconductivity of Solids (1978)
10.1063/1.363903 / J. Appl. Phys. (1996)
10.1063/1.1368156 / J. Appl. Phys. (2001)
10.1103/PhysRevB.73.165317 / Phys. Rev. B (2006)
10.1103/PhysRevB.71.195207 / Phys. Rev. B (2005)
{'key': '2023072705464902500_c23', 'first-page': '121', 'volume': '19', 'year': '1985', 'journal-title': 'Sov. Phys. Semicond.'} / Sov. Phys. Semicond. (1985)
10.1002/pssa.2211140125 / Phys. Status Solidi A (1989)

Dates

Type	When
Created	12 years, 11 months ago (Sept. 21, 2012, 9:48 a.m.)
Deposited	2 years ago (July 27, 2023, 1:47 a.m.)
Indexed	3 weeks, 4 days ago (July 30, 2025, 6:59 a.m.)
Issued	12 years, 11 months ago (Sept. 15, 2012)
Published	12 years, 11 months ago (Sept. 15, 2012)
Published Online	12 years, 11 months ago (Sept. 19, 2012)
Published Print	12 years, 11 months ago (Sept. 15, 2012)

Funders 1

National Science Foundation 10.13039/100000001
Region: Americas
gov (National government)
Labels4
1. U.S. National Science Foundation
2. NSF
3. US NSF
4. USA NSF
Awards1
1. DMR-1104965

BibTeX

@article{Peters_2012, title={Investigation of defect levels in Cs2Hg6S7 single crystals by photoconductivity and photoluminescence spectroscopies}, volume={112}, ISSN={1089-7550}, url={http://dx.doi.org/10.1063/1.4750982}, DOI={10.1063/1.4750982}, number={6}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Peters, J. A. and Cho, Nam Ki and Liu, Zhifu and Wessels, B. W. and Li, Hao and Androulakis, J. and Kanatzidis, M. G.}, year={2012}, month=sep }

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