Cu-In-Ga-Se nanoparticle colloids as spray deposition precursors for Cu(In, Ga)Se2 solar cell materials |
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Authors: | Douglas L. Schulz Calvin J. Curtis Rebecca A. Flitton Holm Wiesner James Keane Richard J. Matson Kim M. Jones Philip A. Parilla Rommel Noufi David S. Ginley |
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Affiliation: | (1) Center for Photovoltaic and Electronic Materials, National Renewable Energy Laboratory, 1617 Cole Blvd., 80401-3393 Golden, CO |
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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%. |
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Keywords: | CuInSe2 CIS colloid nanoparticle solar cell spray deposition |
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