| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
The objective of this project is revealing a fine mechanism of organic photovoltaics and proposing an physical indicator to optimize their power conversion efficiencies (PCE). We performed ab initio calculation for the charge transfer reaction at the interface of electronic donor and acceptor molecules. As a result, pairs of donor and acceptor molecules that are used in high PCE photovoltaics exhibit largest photon-absorbing charge-bridging (PACB) states on both molecules, from which charge separation to free carriers should occur easily. Even if the main absorber of photons is the bulk donor, the charge-bridging states can enhance the charge-generation as additive photon-absorbers at the interface or intermediate states of the charge separation started from donor-excitons. PACB, therefore, leads to the highest short circuit current density and PCE．Finally, we also proposed analyzing photo-induced dipole moment which can be used as an indicator of strength of the PACB.
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