[21p-W531-1~8] Present Situation and Future Prospects of Organic Solar Cells

[21p-W531-6] Challenges for high voltage organic solar cells employing CT light absorbers

〇Tsukasa Yoshida¹, Ken-Ichi Nakayama¹, Akito Masuhara¹, Jun Matsui¹, Masashi Mamada¹, Matthew White², Philipp Stadler³, Markus Scharber³, Cigdem Yumusak³, Niyazi Sariciftci³ (1.Yamagata Univ., 2.Univ. Vermont, 3.Univ. Linz)

Keywords:organic solar cell,charge transfer complex

Bulk-heterojunction relies on charge separation between different materials with an energy offset to facilitate carrier extraction as current, but inherently losing voltage. We started our exploration on organic solar cells employing intra- and intermolecular CT light absorbers. As the energy cascade is removed, high voltage is guaranteed, while current extraction becomes difficult. We found that some compounds with high CT characters achieves free carrier generation due to reduced exciton binding energy.