| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
In organic photovoltaic cell materials, the dissociation of photogenerated charge pairs occurs against a strong Coulomb binding energy. The strength of Coulomb binding energy can be characterized by the Onsager radius, which is defined as the distance at which the Coulomb binding energy is equal to the thermal energy. We studied sensitivity of the ultimate dissociation yield to the assumed form of angular dependence of the charge separation rate using the Marcus equation. Using the exact numerical results, we have shown that this sensitivity is very limited because of length scale separation between the Onsager radius and the molecular scale. By assuming length scale separation, we have derived an analytical expression that describes the electric field dependence of dissociation yield. We have also shown that the field effect on the electron-hole separation probability in donor-acceptor heterojunction systems is weaker than in homogeneous systems by using lattice simulation results.
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