Fabrication of p-type SrCuSeF/n-type In2O3:Sn bilayer ohmic tunnel junction and its application to the back contact of CdS/CdTe solar cells

被引:6
|
作者
Kitabayashi, Shuya [1 ]
Shiina, Yasuyoshi [2 ]
Murata, Ayuki [2 ]
Okamoto, Tamotsu [2 ]
Wada, Takahiro [1 ]
机构
[1] Ryukoku Univ, Dept Chem Mat, Otsu, Shiga 5202194, Japan
[2] Kisarazu Coll, Natl Inst Technol, Kisarazu, Chiba 2920041, Japan
基金
日本科学技术振兴机构;
关键词
TRANSPARENT THIN-FILMS; WIDE-BAND-GAP; ELECTRICAL-CONDUCTION; DELAFOSSITE STRUCTURE; GROWTH; OXIDE; DEPOSITION; SRCU2O2; CUALO2; ZNO;
D O I
10.7567/JJAP.56.08MC18
中图分类号
O59 [应用物理学];
学科分类号
摘要
To develop polycrystalline thin-film tandem solar cells, a SrCuSeF/In2O3:Sn (ITO) bilayer film was studied. The transparent p-type conductive SrCuSeF layer was deposited by pulsed laser deposition (PLD), and the n-type conductive ITO layer was deposited by RF sputtering. The SrCuSeF/ITO bilayer film showed ohmic I-V characteristics. A tunnel junction between the p-type SrCuSeF and n-type ITO layers was successfully formed because the p-type SrCuSeF and the n-type ITO layers had sufficiently high carrier concentrations. The SrCuSeF/ITO bilayer film was applied as the back contact of a CdS/CdTe solar cell. The photovoltaic performance of the CdS/CdTe solar cell depends considerably on the thickness of the SrCuSeF layer. The CdTe solar cell with a back contact of the SrCuSeF layer with a thickness of 34 nm and the ITO layer with a thickness of 200nm showed a high conversion efficiency of 14.3% (V-OC = 804mV, J(SC) = 27.5mA/cm(2), and FF = 0.65). The conversion efficiency was much higher than that of the CdTe solar cell with the SrCuSeF single-layer back contact (11.6%) and that of the CdTe cell with the ITO single-layer back contact (2.75%). (C) 2017 The Japan Society of Applied Physics
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页数:6
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