Cu-In-Ga-Se nanoparticle colloids as spray deposition precursors for Cu(In, Ga)Se2 solar cell materials
Authors: Schulz, Douglas; Curtis, Calvin; Flitton, Rebecca; Wiesner, Holm; Keane, James; Matson, Richard; Jones, Kim; Parilla, Philip; Noufi, Rommel; Ginley, David
Source: Journal of Electronic Materials, Volume 27, Number 5, May 1998 , pp. 433-437(5)
Abstract:The use of nanoparticle colloids for spray deposition of Cu(In,Ga)Se2 (CIGS) precursor films and subsequent fabrication of CIGS solar cells has been investigated. According to this approach, amorphous Cu-In-Ga-Se nanoparticle colloids were first prepared by reacting a mixture of CuI, InI3, and GaI3 in pyridine with Na2Se in methanol at reduced temperature. Purified colloid was sprayed onto heated molybdenum-coated sodalime glass substrates to form Cu-In-Ga-Se precursor films. After thermal processing of the precursor films under a selenium ambient, CIGS solar cells were fabricated. Cu-In-Ga-Se colloids and films were characterized by inductively coupled plasma atomic emission spectroscopy, thermogravimetric analysis, transmission electron microscopy, x-ray diffraction, scanning electron microscopy, and Auger electron spectroscopy. Standard current-voltage characterization was performed on the CIGS solar cell devices with the best film exhibiting a solar conversion efficiency of 4.6%.
Document Type: Research Article
Publication date: May 1, 1998