Surface Morphology and Device Performance of CuInS2 Solar Cells Prepared by Single- and Two-Step Evaporation Methods
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概要
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Absorbers of CuInS2 (CIS) solar cells are fabricated by several processes and a 11.4% efficiency CIS solar cell is reported. However, this value is lower than the theoretically expected value, possibly owing to the roughness of the CIS surface. In this study, we attempted to realize smoother CIS films using a new two-step evaporation method. As a first step, Cu-rich CIS films were deposited at a low substrate temperature of 50 °C and were annealed at 500 °C. As a second step, In and S were sequentially deposited on the annealed films to control the compositional ratio to In-rich. The deposited film showed a smoother surface than the film deposited by the single-step evaporation of Cu, In, and S. The CIS solar cell formed using the two-step evaporation method showed a higher open-circuit voltage. This should be due to the smoother film surface, which reduced the p--n junction area of the device.
- 2011-04-25
著者
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MINEMOTO Takashi
Ritsumeikan University, College of Science and Engineering
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TAKAKURA Hideyuki
Ritsumeikan University, College of Science and Engineering
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Kondo Toshihiro
Physical Chemistry Laboratory Division Of Chemistry Graduate School Of Science Hokkaido University
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Kondo Toshihiro
Div. Of Sci. Graduate School Of Humanities And Sciences Ochanomizu Univ. Ohtsuka Bunkyo-ku Tokyo 112
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Kondo Toshihiro
Physical Chemistry Laboratory Department Of Chemistry Faculty Of Science Hokkaido University
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Oda Yusuke
Ritsumeikan Global Innovation Research Organization, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
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Oda Yusuke
Ritsumeikan University, Ritsumeikan Global Innovation Research Organization, Kusatsu, Shiga 525-8577, Japan
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Fukamizu Shohei
Ritsumeikan University, College of Science and Engineering, Kusatsu, Shiga 525-8577, Japan
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Kondo Toshihiro
Ritsumeikan University, College of Science and Engineering, Kusatsu, Shiga 525-8577, Japan
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Minemoto Takashi
Ritsumeikan University, Ritsumeikan Global Innovation Research Organization, Kusatsu, Shiga 525-8577, Japan
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Minemoto Takashi
Ritsumeikan Global Innovation Research Organization (R-GIRO), Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
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Takakura Hideyuki
Ritsumeikan University, College of Science and Engineering, Kusatsu, Shiga 525-8577, Japan
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Takakura Hideyuki
Ritsumeikan University
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