Liu Z.-L.Chen F.-S.Lu C.-H.2019-05-132019-05-13201302728842https://scholars.lib.ntu.edu.tw/handle/123456789/407383Copper gallium diselenide (CuGaSe2) powders were synthesized via the sol-gel method followed by a selenization process. The sol-gel process can effectively reduce the required synthesis temperature to 400 C due to enhanced reactivity and improved composition homogeneity. The amount of Cu2Se impurity phase was decreased when sufficient Ga3+ was added to the precursors. CuGaSe2 powders were successfully prepared when the Ga3+/Cu2+ molar ratio was increased to 2. The formation of CuGaSe2 with a pure chalcopyrite structure was confirmed via the Rietveld refinement analysis. With decreasing Ga3+/Cu2+ molar ratios, the particle size of the prepared CuGaSe2 powders was significantly enlarged because the copper selenide phase acted as a flux for the particle growth. The optical absorption spectra revealed the obtained CuGaSe2 to have a band gap of 1.68 eV. The sol-gel method combined with the selenization process was demonstrated to provide a potential approach for fabricating CuGaSe2 materials. ? 2013 Elsevier Ltd and Techna Group S.r.l.A. Sol-gel processesChalcopyriteCuGaSe2journal article10.1016/j.ceramint.2013.04.0422-s2.0-84883784729https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883784729&doi=10.1016%2fj.ceramint.2013.04.042&partnerID=40&md5=516e3b625bebddb45782ab0e401098f8