Chemical deposition of bismuth selenide thin films using N,N-dimethylselenourea

Authors: Garca V.M.¹; Nair M.T.S.¹; Nair P.K.¹; Zingaro R.A.²

Source: Semiconductor Science and Technology, Volume 12, Number 5, 1997 , pp. 645-653(9)

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Abstract:

Good quality thin films of bismuth selenide of thickness up to were deposited from solutions containing bismuth nitrate, triethanolamine and N,N-dimethylselenourea maintained at temperatures ranging from room temperature to . X-ray diffraction patterns of the samples annealed at in air match the standard pattern of hexagonal (paraguanajuatite, JCPDS 33-0214). The films exhibit strong optical absorption corresponding to a bandgap of about 1.7 - 1.41 eV in the as-prepared films. These values decrease to about 1.57 - 1.06 eV upon annealing the films at for 1 h in nitrogen. As-deposited, the films show high sheet resistance in the dark. Annealing the films in air or in nitrogen enhances the dark current by about seven orders of magnitude; the resulting dark conductivity is about . This enhancement in conductivity results from improved crystallinity as well as from partial loss of selenium.

Language: English

Document Type: Miscellaneous

Affiliations: 1: Laboratorio de Energ?a Solar, IIM, Universidad Nacional Autonoma de M?xico, Temixco-62580, Morelos, Mexico 2: Department of Chemistry, Texas A&M University, College Station, TX 77843-3255, USA

Publication date: 1997-01-01