Title :
Superstrate CuInS2 solar cells fabricated by spray-pyrolysis methods
Author :
Nguyen, D.C. ; Ryo, T. ; Ito, S.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of Hyogo, Himeji, Japan
Abstract :
CuInS2 (CIS) films were deposited on In2S3/TiO2/FTO/glass under air by spray pyrolysis, resulting in superstrate-structured solar cells. We found the significant difference of images between SEM and optical microscope, which suggests crystallization of spray-pyrolysis CIS particles in In2S3 layer. The In2S3 covering layer was confirmed by Auger Electron spectroscopy. Titanium-doping in In2S3 improved fill factor of CIS cells, however, the conversion efficiency was not changed. The best cells were achieved at 4 % sodium doping using 350 °C hot-plate and their cell parameters are open-circuit voltage = 0.551 V, photocurrent density = 11.65 mA/cm2, fill factor = 0.45, and a conversion efficiency = 2.88%.
Keywords :
Auger electron spectroscopy; copper compounds; crystallisation; indium compounds; optical microscopy; photoconductivity; pyrolysis; semiconductor doping; semiconductor thin films; sodium; solar cells; spray coatings; ternary semiconductors; titanium; Auger electron spectroscopy; CuInS2; In2S3-TiO2-SnO2:F-SiO2; SEM; cell parameters; conversion efficiency; fill factor; hot plate; open circuit voltage; optical microscope; photocurrent density; sodium doping; spray pyrolysis CIS particle crystallisation; superstrate-structured solar cell; thin film deposition; titanium doping; Copper; Films; Photoconductivity; Photovoltaic cells; Scanning electron microscopy; Surface morphology; Surface treatment;
Conference_Titel :
Photovoltaic Specialists Conference (PVSC), 2011 37th IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
978-1-4244-9966-3
DOI :
10.1109/PVSC.2011.6186522
