| Budget Amount *help |
¥44,070,000 (Direct Cost: ¥33,900,000、Indirect Cost: ¥10,170,000)
Fiscal Year 2020: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2019: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2018: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
Fiscal Year 2017: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000)
Fiscal Year 2016: ¥10,270,000 (Direct Cost: ¥7,900,000、Indirect Cost: ¥2,370,000)
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| Outline of Final Research Achievements |
To achieve the solar cell with above 30% conversion efficiency, to develop the tandem solar cells which have the multiple power generation layers is necessary with different bandgaps with minimizing the efficiency loss at top cells, bottom cells and their interface. The method to independently control the grain size of perovskite thin film was developed and the effect of grain size on the efficiency of perovskite solar cell was clarified. To reduce the cost of monocrystalline Si bottom cell, the fabrication process of wafer level thin monocrystalline Si was developed by nanometer-level smoothing of porous Si underlayer and the epitaxy by rapid vapor deposition on it. As for the Si/perovskite interface, the effect of thermal annealing process on the TiO2 interlayer was investigated which works as the passivation layer of the bottom Si surface and the electron transfer layer of perovskite top cell.
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