Size quantization in semiconductor particulate films

• Published in: Journal of physical chemistry (1952) Vol. 95; no. 9; pp. 3716 - 3723
• Main Authors: Zhao, Xiao Kang, Fendler, Janos H
• Format: Journal Article
• Language: English
• Published: Washington, DC American Chemical Society 01.05.1991
• Subjects: 360602 - Other Materials- Structure & Phase Studies; ABSORPTION SPECTROSCOPY; ARACHIDONIC ACID; BAND THEORY; CADMIUM COMPOUNDS; CARBOXYLIC ACID SALTS; CARBOXYLIC ACIDS; CHALCOGENIDES; CHARGED PARTICLES; Chemistry; COHERENT SCATTERING; Colloidal state and disperse state; CRYSTAL LATTICES; CRYSTAL STRUCTURE; CUBIC LATTICES; DATA; DIFFRACTION; ELECTRON MICROSCOPY; ELEMENTS; Exact sciences and technology; EXPERIMENTAL DATA; General and physical chemistry; HEXAGONAL LATTICES; HYDROGEN COMPOUNDS; HYDROGEN SULFIDES; INFORMATION; IONS; MATERIALS; MATERIALS SCIENCE; METALS; MICROSCOPY; MONOCARBOXYLIC ACIDS; NUMERICAL DATA; ORGANIC ACIDS; ORGANIC COMPOUNDS; PARTICLE SIZE; PARTICLES; PARTICULATES; Physical and chemical studies. Granulometry. Electrokinetic phenomena; SCANNING ELECTRON MICROSCOPY; SCATTERING; SEMICONDUCTOR MATERIALS; SIZE; SPECTROSCOPY; SULFIDES; SULFUR COMPOUNDS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; ZINC COMPOUNDS; Monolayer; Particle size; Semiconductor materials; Particle suspension; Cadmium Sulfides; Experimental study; X ray diffraction; Scanning tunneling microscopy; Metal Sulfides; Transmission electron microscopy; Zinc Sulfides; Physical method; Modified material
• ISSN: 0022-3654; 1541-5740
• DOI: 10.1021/j100162a051

Slow infusion of H{sub 2}S onto cadmium arachidate, zinc arachidate, or metal-ion-coated monolayers resulted in the formation of metal sulfide particles which, when transferred to solid substrates in different stages of their growth, produced semiconductor particulate films. CdS and ZnS semiconductor particulate films were established to be predominantly hexagonal and cubic crystallites by X-ray diffraction. Transmission electron and scanning tunneling microscopies, as well as absorption spectroscopy, provided evidence for the initial formation of 30 {plus minus} 5 {angstrom}, three-dimensional, size-quantized particles. Longer exposure to H{sub 2}S resulted in the formation of 30-40-{angstrom}-thick, 30-80-{angstrom}-diameter CdS polyparticles which ultimately evolved into porous semiconductor films of different thicknesses. The optical-thickness-dependent, direct bandgap shifts and the recovery of bulk bandgaps upon heating the 150-300-{angstrom}-thick CdS and ZnS semiconductor particulate films were rationalized in terms of size quantization.