[14p-311-1~19] 12.2 Characterization and Materials Physics

△ [14p-311-7] Morphology and electronic structure of PC₆₁BM/α-6T interface resulting from crystallinity variation in PC₆₁BM film

〇Takumi Kumai¹, Kouki Akaike¹, Takuya Fuse¹, Shunsuke Dekubo¹, Akira Onishi¹, Tatuhiro Tago², Yuki Kashimoto², Chiaki Numata², Shun Ouchi², Hiroyuki Yoshida², Kaname Kanai¹ (1.Tokyo Univ. Sci., 2.Chiba Univ.)

Keywords:donor/acceptor interface, morphology, electronic structure

In this work, we investigated morphology and electronic structure of a model donor/acceptor interface for P3HT:PC₆₁BM bulk-heterojunction organic photovoltaic cell: PC₆₁BM/α-6T planar heterojunction. It was found that, upon crystallization of PC₆₁BM spin-coated film by thermal annealing, growth mode of α-6T overlayer drastically changes due to the increase in surface energy. We will further demonstrate the energy level alignment of PC₆₁BM/α-6T interface with focusing thickness-dependent orientation of α-6T.