| Budget Amount *help |
¥42,120,000 (Direct Cost: ¥32,400,000、Indirect Cost: ¥9,720,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2017: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2016: ¥14,430,000 (Direct Cost: ¥11,100,000、Indirect Cost: ¥3,330,000)
Fiscal Year 2015: ¥23,140,000 (Direct Cost: ¥17,800,000、Indirect Cost: ¥5,340,000)
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| Outline of Final Research Achievements |
A microscopic measurement technique that can visualize the nanometer-scale distribution of local conversion performance in highly non-uniform organic solar cell devices was developed, where a scanning tunneling microscope (STM) is used to locally collect the photocarriers that were generated in an illuminated solar cell. The developed technique, light-modulated STM (LM-STM) allows us to acquire local I-V characteristics of solar cells as well as their illumination intensity dependence. It was pointed out that, compared to the macroscopic device I-V characteristics, the acquired local I-V characteristics are generally much more strongly affected by the inner resistance of the device materials and a guideline how to extract the local carrier generation rate and photovoltage from such local I-V characteristics is given. A new type of pulse-laser-assisted time-resolved STM system was developed to measure the local carrier life time in a solar cell device.
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