Title :
A comprehensive characterization of the interfaces in Mo/CIS/CdS/ZnO solar cell structures
Author :
Schmid, Dieter ; Ruckh, Martin ; Schock, Hans Werner
Author_Institution :
Inst. fur Phys. Elektronik, Stuttgart Univ., Germany
Abstract :
The alignment of energy bands in a Mo/CIS/CdS/ZnO solar cell structure is presented. Special attention is paid to the surface chemistry of the molybdenum coated substrate. In this study we have performed in situ analyses on polycrystalline thin films starting from the molybdenum coated soda lime glass. The different films have been deposited sequentially under ultra high vacuum conditions and analyzed with photoelectron spectroscopy techniques. We have found that Mo surface is significantly oxidized. Air annealing at 200°C leads to a diffusion of sodium through the Mo layer. Mo-O and Mo-Se compounds are formed and present during the evolution of the Mo-CIS interface. Band lineups have been determined for the CIS/CdS/ZnO interfaces of the solar cell structure. We have found no indication for band discontinuities deteriorating the solar cell device performance
Keywords :
II-VI semiconductors; cadmium compounds; copper compounds; energy gap; indium compounds; molybdenum; p-n heterojunctions; photoelectron spectroscopy; semiconductor thin films; semiconductor-metal boundaries; solar cells; spectroscopy; substrates; surface chemistry; ternary semiconductors; zinc compounds; 200 C; Mo-CuInSe2-CdS-ZnO; Mo-O; Mo-Se; Mo/CIS/CdS/ZnO solar cell structures; air annealing; energy bands alignment; interfaces characterisation; molybdenum coated substrate; photoelectron spectroscopy; polycrystalline thin films; soda lime glass; sodium diffusion; surface chemistry; ultra high vacuum deposition; Annealing; Chemistry; Computational Intelligence Society; Glass; Performance analysis; Photovoltaic cells; Spectroscopy; Transistors; Vacuum technology; Zinc oxide;
Conference_Titel :
Photovoltaic Energy Conversion, 1994., Conference Record of the Twenty Fourth. IEEE Photovoltaic Specialists Conference - 1994, 1994 IEEE First World Conference on
Conference_Location :
Waikoloa, HI
Print_ISBN :
0-7803-1460-3
DOI :
10.1109/WCPEC.1994.519842
