| Budget Amount *help |
¥18,330,000 (Direct Cost: ¥14,100,000、Indirect Cost: ¥4,230,000)
Fiscal Year 2013: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2012: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2011: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2010: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
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| Research Abstract |
Based on the signal generation and propagation principle of the photothermal spectroscopy, we have developed the in-depth profiling technique that detects the non-radiative recombination loss of photo-generated carriers in the multi-junction solar cells. After applying the frequency-dependent piezoelectric photothermal (PPT) measurements to the multi-quantum well (MQW) structure inserted p-i-n GaAs solar cells, we detected the PPT signals originating from MQWs even in the high frequency measuring conditions. When higher frequency, the PPT signals generated within the MQW region are expected to exponentially decrease because of decreasing the thermal diffusion length. Present experimental results show clearly that photo-generated carries in MQW can thermally escape and the carrier collection efficiency at room temperature is significantly improved.
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