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Sol–Gel Synthesis of Cadmium Telluride‐Microcrystal‐Doped Silica Glasses
Author(s) -
Nogami Masayuki,
Nagasaka Katsumi,
Suzuki Toshiharu
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb05471.x
Subject(s) - cadmium telluride photovoltaics , absorption edge , materials science , doping , sol gel , absorption (acoustics) , telluride , analytical chemistry (journal) , crystallography , mineralogy , chemistry , band gap , nanotechnology , optoelectronics , metallurgy , composite material , organic chemistry
The sol–gel process has been applied to the preparation of small‐sized CdTe‐doped silica glasses. Gels synthesized by the hydrolysis of a complex solution of Si(OC 2 H 5 ) 4 , Cd(CH 3 COO) 2 · 2H 2 O, and Te were heated from 350° to 600°C in a H 2 ─N 2 atmosphere to form fine cubic CdTe crystals. The size of CdTe crystals, determined from the line broadening of X‐ray diffraction pattern, increases from 4 to 9 nm in diameter with increasing heat‐treatment temperature. The optical absorption edge shifts to the higher‐energy side as the size of the CdTe crystals decreases. This phenomenon is interpreted in terms of a quantum confinement effect of electron and hole in the CdTe microcrystals.