| Budget Amount *help |
¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000)
Fiscal Year 2016: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2015: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2014: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
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| Outline of Final Research Achievements |
Hybrid inorganic/organic solar cells based on size-tunable silicon quantum dots (SiQDs) and conjugated polymers are optimized through tuning the surface termination as well as phosphorous doping of SiQDs. Freestanding SiQDs were successfully synthesized by the newly developed in-flight plasma CVD reactor: SiQDs are blended with either P3HT or PTB7 in a solution phase. The resulting silicon inks were spin-cast to form a bulk hetrojunction structure, on which a hybrid solar cell is fabricated. By altering the surface termination of as-produced SiQDs from predominately chlorine termination to hydrogen termination, the power conversion efficiency (PCE) of a hybrid solar cell is significantly improved. PTB7-based solar cells efficiently respond to a wider spectrum of sunlight than P3HT-based devices, resulting in PCE up to 5%. The further increase in photoelectric performance towards PCE 10% by the reduced crystalline defects as well as post annealing were verified.
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