Photoelectrochemical properties of semiconducting cadmium mercury telluride thin films with bandgaps between 1.47 and 1.08 eV

M. Neumann-Spallart, Govindasamy Tamizhmani, C. Levy-Clement

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Films of Cd-rich cadmium mercury telluride (cdxHg1-xTe, CMT) 0.1 to 2 μm thick were formed on conducting glass (SnO2) and cadmium substrates by electrochemical (potentiostatic) deposition from an aqueous bath. 1 - x ranged from 0 to 0.25. The photoresponse of CMT electrodes of n- and p-type was investigated in electrolytes containing different redox couples. In 1M polysulfide solution, the onset of photocurrents was found at -1.1V vs. SCE, independent of the optical bandgap. In the plateau range of the photocurrent potential curves, quantum yields of charge collection up to 0.45 were measured for Cd0.9Hg0.1Te. The long-wavelength onset of photoresponse varied with the bandgap (1.47-1.08 eV) for 1 - x between 0.01 and 0.2. The drawback of the small minority-carrier diffusion length of CMT grown by electrocrystallization can be circumvented with stacked, semitransparent thin-film electrodes. Experiment show that with such a configuration of thin CMT films grown on transparent substrates, the total photocurrent output can be increased considerably.

Original languageEnglish (US)
Pages (from-to)3434-3437
Number of pages4
JournalJournal of the Electrochemical Society
Volume137
Issue number11
StatePublished - Nov 1990
Externally publishedYes

Fingerprint

mercury cadmium tellurides
Mercury (metal)
Photocurrents
Cadmium
photocurrents
Energy gap
Thin films
thin films
polysulfides
Polysulfides
Electrodes
electrodes
Optical band gaps
Quantum yield
Substrates
diffusion length
minority carriers
cadmium
Electrolytes
baths

ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

Photoelectrochemical properties of semiconducting cadmium mercury telluride thin films with bandgaps between 1.47 and 1.08 eV. / Neumann-Spallart, M.; Tamizhmani, Govindasamy; Levy-Clement, C.

In: Journal of the Electrochemical Society, Vol. 137, No. 11, 11.1990, p. 3434-3437.

Research output: Contribution to journalArticle

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