Optimization of Compositional Ratio of Zn(O,S) Window Layer in CuInS2 Solar Cells

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概要

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• CuInS2 (CIS) solar cells with Zn(O,S) window layers deposited by co-sputtering were fabricated to optimize the conduction band offset (CBO) of Zn(O,S)/CIS. Zn(O,S) has an advantage in the control of the CBO because the conduction band minimum can be controlled by \text{S}/(\text{S}+\text{O}) compositional ratios. The efficiency of the CIS solar cells with the Zn(O,S) window layers increased with increasing \text{S}/(\text{S}+\text{O}) ratio from 0.19 to 0.50. However, the efficiency decreased at the \text{S}/(\text{S}+\text{O}) ratio of 0.59 owing to the decrease in the fill factor because of the double-diode-like behavior. The maximum efficiency was obtained at the \text{S}/(\text{S}+\text{O}) ratio of 0.50. Also, the CIS solar cell with standard bi-layer buffers of sputtered ZnO and chemical-bath-deposited CdS was fabricated and the performance was compared.

• 2012-10-25

著者

• MINEMOTO Takashi

  College of Science and Engineering, Ritsumeikan University

• TAKAKURA Hideyuki

  College of Science and Engineering, Ritsumeikan University

• Yamamoto Akito

  College of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan

• Hamazaki Ryosuke

  College of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan

• Oda Yusuke

  Ritsumeikan Global Innovation Research Organization, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan

• Fukamizu Shohei

  College of Science and Engineering, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan

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