| Project/Area Number |
15K14305
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Energy engineering
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| Research Institution | Nagaoka National College of Technology |
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Principal Investigator |
Araki Hideaki 長岡工業高等専門学校, 物質工学科, 教授 (40342480)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | ヨウ化物 / 化合物薄膜太陽電池 / 太陽電池 / 薄膜 / 塗布 |
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| Outline of Final Research Achievements |
In this study, we have focused on bismuth iodide (BiI3), which is lead-free, and thus has less environmental impact. A BiI3 thin-film was prepared by spin-coating a solution of BiI3 in N,N-dimethylformamide. From the optical measurements, the band gap energy of BiI3 was estimated to be 1.8 eV and the absorption coefficient was higher than 10000 cm-1 at wavelengths of less than 670 nm. Printable thin-film solar cells were fabricated with a FTO/compact-TiO2/porous-TiO2/BiI3/spiro-MeOTAD/Au structure using BiI3 as the light-absorbing layer. The solar cell fabricated with a BiI3 thin film annealed at 70 °C had an open-circuit voltage of 0.25 V, a short-circuit current density of 0.96 mA/cm2, a fill factor of 0.42, and a conversion efficiency of 0.10%.
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