Composition control of Cu2ZnSnSe4-based solar cells grown by coevaporation
| Autor: | Shigeru Niki, Hajime Shibata, Kikuo Makita, Hironori Komaki, Hitoshi Tampo, Shogo Ishizuka, Akimasa Yamada, Koji Matsubara, S. Furue |
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| Rok vydání: | 2014 |
| Předmět: |
Materials science
Energy conversion efficiency Metals and Alloys Analytical chemistry Surfaces and Interfaces Concentration ratio Surfaces Coatings and Films Electronic Optical and Magnetic Materials symbols.namesake X-ray crystallography Materials Chemistry symbols Thin film Spectroscopy Raman spectroscopy Tie line Deposition (law) |
| Zdroj: | Thin Solid Films. 551:27-31 |
| ISSN: | 0040-6090 |
| Popis: | The relationship between the composition and conversion efficiency of Cu 2 ZnSnSe 4 (CZTSe)-based solar cells was investigated. CZTSe films were grown by thermal deposition using a coevaporation method. It was found that the composition of CZTSe and Na concentration [Na] have strong correlations to the conversion efficiency, and higher-efficiency samples were obtained with the composition ratios closer to Zn/Sn ~ 1.6, Cu/(Zn + Sn) ~ 0.8, and [Na] ~ 2%. The highest conversion efficiency ( η = 2.1%) was obtained in the composition region, and the composition was significantly nonstoichiometric. The CZTSe composition was automatically fixed on a tie line between Cu 2 ZnSnSe 4 and ZnSe, and it was demonstrated that this composition can be expressed by one parameter. The structural and electrical properties of the high- and low-efficiency samples were also investigated. No significant differences in such properties were observed between the high- and low-efficiency samples by surface, x-ray diffraction, and Raman measurements. However, the low-efficiency sample showed a high carrier concentration. |
| Databáze: | OpenAIRE |
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