Recombination processes in pyrolytic cadmium sulfide films

Autor:	V. G. Klyuev, T. L. Maiorova
Rok vydání:	2009
Předmět:	Materials science Band gap Photoconductivity Doping Analytical chemistry Activation energy Conductivity Condensed Matter Physics Alkali metal Atomic and Molecular Physics and Optics Cadmium sulfide Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Pyrolytic carbon
Zdroj:	Semiconductors. 43:292-296
ISSN:	1090-6479 1063-7826
DOI:	10.1134/s1063782609030063
Popis:	The study concerns the photoelectric properties of pyrolytic CdS films, both undoped and doped with alkali metals. It is established that the films exhibit a long relaxation time of the photoconductivity at room temperature (t = 103−104 s). The long relaxation is due to internal potential barriers between regions different in conductivity. The activation energy of the stored-up conductivity is determined at E = 0.68 eV. By thermostimulated conductivity studies of the films, three types of electron localization levels are found. These are related to sulfur vacancies (0.48 eV), oxygen substituting for sulfur (0.5 eV), and adsorbed alkali metal atoms (0.53 eV). On the basis of the results of studies of recombination processes, the model of energy levels in the band gap of pyrolytic CdS films doped with alkali metals is developed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1c6df25c15843ffd30ba61de0fce6b53 https://doi.org/10.1134/s1063782609030063 Zobrazit plný text záznamu Plný text ve formátu PDF