A corrosion study and minority carrier diffusion length determination of n-type SnS2 and SnSSe

✍ Scribed by B. Fotouhi; A. Katty

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 602 KB
• Volume: 31
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(86)85010-1

✦ Synopsis

Corrosion behaviour of n-type S&s and SnSSe single crystals in aqueous solutions has been studied. It has been shown that SnSs and SnSSe undergo a corrosion reaction in the dark when electrolytes contain oxidizing agents such as Fe(CN)f-(K0I-I) and Ce4+ (HsSOa). Corrosion haa a chemical nature. Values of absorption coefficient and hole diffusion length has been determined for both materials using the C%rtner modeL A hole diffusion length of (2& 0.5) x lo-$ em and (5 f 2) x lo-' cm was obtained, respectively, for samples prepared by Bridgman and Transport methods. The difference in hole diffusion length is explained by the existence of recombination centers produced by the transporting agent in the crystal bulk. A quantum yield of greater than one is found for SnSSe at high photon energies (greater than 2 eV). This phenomenon has been explained by activation of a second electron from surface states above the valence band to the surface states below the conduction band. INTRODUCPION