[19a-C302-1~11] 12.5 Organic and hybrid solar cells

11:00 AM - 11:15 AM JST(2:00 AM - 2:15 AM UTC)

[19a-C302-8] The influence of molecular orientation at the bulk heterojunction interface of organic thin-film solar cells on energy level

〇Daisuke Hamamura¹, Seihou Jinnai², Yutaka Ie², Hiroyuki Yoshida^1,3 (1.Chiba Univ., 2.Osaka Univ., 3.Chiba Univ.)

Keywords:

semiconductor,organic thin-film solar cell,photoelectron spectroscopy

The electrostatic potential generated by molecular quadrupoles may be modified by the donor-acceptor interface structure, thereby improving the charge separation efficiency of organic thin-film solar cells. To test this idea, we selected three non-fullerene acceptors, Ph-X (X=D, H, MH). Substituting with different terminal alkyl groups X can change the London dispersion force and modulate the interfacial structure of the film mixture with P3HT. In this study, the HOMO and LUMO levels of the mixed films were investigated using UV photoelectron spectroscopy and low-energy inverse photoelectron spectroscopy. The results show that the electronic levels in the mixed film are modified by the electrostatic potential and depend on the interfacial structure.