Preparation and Characterization of Copper Indium Diselenide Thin Films
Date Issued
2010
Date
2010
Author(s)
Liu, Shih-Hsien
Abstract
CuInSe2 thin films were synthesized via selenizing the Cu-In alloys-containing precursors. The alloy nanoparticles with CuIn and Cu2In were obtained via the NaBH4-assisted chemical reduction method in ethylene glycol. The nanoparticles with a size around 40-60 nm were formed. On selenization, CuInSe2 phase started to be formed at as low as 250℃. The significant grain growth of the particles was observed in the thin films selenized at elevated temperatures because of the presence of Cu-Se compounds. The monophasic CuInSe2 thin film with large grains was formed at 550℃. The formation of CuInSe2 with a chalcopyrite structure was confirmed via Raman spectroscopy. However, densified thin films were not observed.
In the second part of the study, the nanopowders consisting of Cu-In alloys and In were synthesized via the chemical reduction method using NaBH4 as the reductant and water as the solvent. On selenization, CuInSe2 was found to coexist with the intermediate compounds of In2O3, CuSe, and Cu2Se. The sizes of the grains in the thin films were significantly increased because of the existence of Cu-Se phases. When the selenization temperature was raised to 550℃, the densified CuInSe2 films with a grain size of about 2 um were formed. The Raman spectroscopy and the Rietveld refinement method confirmed the formation of pure chalcopyrite phase of CuInSe2. The band gap of the CuInSe2 thin film was measured to be 0.97 eV via the UV-visible-NIR spectroscopy. The formation of CuInSe2 throughout the thin film was verified via grazing incident X-ray diffraction. Using the alloy nanoparticles for the coating process was demonstrated to be a potential way for preparing the CuInSe2 thin films. The CuInSe2 thin-film solar cells exhibited a photovoltaic conversion efficiency of 1.47% under AM 1.5G illumination.
Subjects
Cu-In alloys
Nanopowders
NaBH4
CuInSe2
Thin films
Solar cells
SDGs
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-99-R97524009-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):edfb560af0c841eb16ee06affe039d02