OPTICAL-PROPERTIES OF ULTRADISPERSE PARTICLES OF CUINS2 IN COLLOIDAL SOLUTIONS

The formation of ultradisperse CuInS2 particles during chemical precip itation in aqueous and acetonitrile solutions, which results in the fo rmation of stable colloidal solutions and film matrices containing CuI nS2 particles less than 10 nm in size is studied. The absorption spect ra of colloids and film matrices with particle sizes in the range 1 - 6 nm are shifted toward the high-energy region in comparison with the spectrum of crystalline CuInS2, and they acquire an additional absorpt ion band upon aging. The variation of the spectral characteristics of CuInS2 is considered from the standpoint of quantum-size effects in se miconductors.