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Enhancement of photosensitivity in chemically deposited CdSe thin films by air annealing (1993)

Nair, M. T. S. ; Nair, P. K. ; Zingaro, Ralph A. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 74 (1993), S. 1879-1884

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: Improvement in photosensitivity, (σphoto−σdark)/σdark, of chemically deposited CdSe thin films on annealing in air is discussed. The as-prepared films of ∼0.5 μm thickness show photosensitivities of 〈10 under 600 W m−2 illumination. Upon annealing the films in air for 1 h each at various temperatures their photosensitivity increases depending on the temperature of annealing: ∼10 (200 °C), ∼102 (300 °C), ∼103 (400 °C), and ∼107 (450 °C). Air annealing at temperatures beyond 450 °C was found to cause degradation in the photosensitivity. The high photosensitivity is also accompanied by growth in photocurrent while maintaining a fast decay of ∼6 decades in 〈1 s after shutting off the illumination. Such a short decay time is unusual with chemically deposited photoconductive thin films. The results are explained on the basis of improvement in crystallinity and increase in chemisorption of oxygen upon annealing the films in air. X-ray-diffraction data and x-ray photoelectron spectroscopy depth profiling of the annealed films are presented in support of this explanation.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.354796

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Substituted selenourea-tellurium tetrahalide adducts: Precursors to selenium-tellurium alloys (1990)

Pathirana, Hema M. K. K. ; Zingaro, Ralph A. ; Meyers, Edward A. ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Heteroatom Chemistry 1 (1990), S. 401-406

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ISSN: 1042-7163

Keywords: Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: N,N-Dimethylselenourea (DMSeU) yields, with TeX4 (X = Cl or Br), a variety of compounds having bonds from selenium to tellurium. Excluding molecules of solvation these compounds display the following stoichiometries: [(DMSeU)4Te]X2, (DMSeU)3(TeX4)2, and (DMSeU)2Te2X6. Tetramethylselenourea (TMSeU) gives, with TeBr4, crystals of (TMSeU)2TeBr4. Both the carbon-selenium and tellurium-halogen bonds undergo hydrolysis under mild conditions to yield precipitates that are alloys of selenium and tellurium. Thus, this group of compounds affords a new approach to the synthesis of selenium-tellurium alloys. Some of the properties of these compounds, as well as the crystal structure of [(DMSeU)4Te]Cl2, are described in this article.

Additional Material: 1 Ill.