| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Outline of Final Research Achievements |
In this study, We developed a method to evaluate defects from photo-absorption for the photo-absorption layer in compound thin film solar cells using Fourier transform photocurrent spectroscopy (FTPS). We also evaluated Cu2ZnSn(S,Se)4(CZTSSe) solar cell using it. The exponential tail was observed in the photon-energy region smaller than the band gap energy of CZTSSe. The exponential tail would be related to antisite point defects of Cu and Zn. Furthermore, absorption near 1.3eV was observed through the FTPS measurement of CZTSSe solar cell under bias light irradiation. This absorption would be related to gap-state defect induced by bias light irradiation and would cause decrease of quantum efficiency in the high photon-energy region under the irradiation of white bias light.
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