| Budget Amount *help |
¥24,960,000 (Direct Cost: ¥19,200,000、Indirect Cost: ¥5,760,000)
Fiscal Year 2016: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2015: ¥20,410,000 (Direct Cost: ¥15,700,000、Indirect Cost: ¥4,710,000)
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| Outline of Final Research Achievements |
The bulk photovoltaic effect observed in polar materials has a potential to be a photon-to-electron conversion mechanism to realize novel high efficiency solar cells. In this study, I investigated photovoltaic properties of heterojunctions composed of LaFeO3 and SrTiO3. Due to the polar discontinuity at the interface, the originally nonpolar insulator LaFeO3 becomes polar. The junctions exhibit anomalous photovoltaic properties driven by the induced polarization, such as the reversal of the sign of photocurrent depending on the thickness and interfacial termination layer. The photovoltaic efficiency of the LaFeO3 junctions exhibits large improvement compared to other Mott insulator junctions due to the bulk photovoltaic effect associated with the induced polarization.
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