Synthesis of CuInSe 2 films via selenizing the Cu-In alloy-containing nanopowders
Journal
Journal of Alloys and Compounds
Journal Volume
517
Pages
14-19
Date Issued
2012
Author(s)
Abstract
CuInSe 2 thin films were prepared employing nanopowders consisting of Cu-In alloys and In as the precursors of selenization. The nanopowders were synthesized via the chemical reduction method using NaBH 4 as the reductant and water as the solvent. On selenization at 350 ¢XC, CuInSe 2 started to form along with the intermediate compounds of copper selenides. The sizes of the grains in the thin films were significantly increased at 450 ¢XC because of the existence of Cu-Se phases. When the selenization temperature was raised to 550 ¢XC, the densified CuInSe 2 films with a grain size of around 2 £gm were observed. The formation and uniformity of single-phase CuInSe 2 throughout the thin film were verified via grazing incident X-ray diffraction. The Raman spectroscopy and the Rietveld refinement method confirmed the pure chalcopyrite phase of CuInSe 2. The band gap of the CuInSe 2 thin film was measured to be 0.97 eV via the UV-visible-NIR spectroscopy. The CuInSe 2 thin-film solar cells exhibited a photovoltaic conversion efficiency of 1.47% under AM 1.5 G illumination. ? 2011 Elsevier B.V.
Subjects
CuInSe 2
NaBH 4
Nanopowders
Solar cells
SDGs
Other Subjects
Chemical reduction methods; CuInSe 2; Grain size; Intermediate compound; NaBH 4; Nanopowders; Photovoltaic conversion; Reductants; Rietveld refinement method; Selenides; Selenization; Thin-film solar cells; Conversion efficiency; Copper alloys; Copper compounds; Nanostructured materials; Near infrared spectroscopy; Raman spectroscopy; Rietveld refinement; Selenium compounds; Semiconducting selenium compounds; Solar cells; Solar power generation; Thin films; X ray diffraction; Copper
Type
journal article