[11a-M112-1~11] 12.2 Characterization and Materials Physics

△ [11a-M112-7] STM study on local disordering upon organic heterointerface formation

〇Akira Onishi¹, Kouki Akaike², Yutaka Wakayama³, Kaname Kanai¹ (1.Tokyo Univ. of Sci, 2.AIST, 3.NIMS, WPI-MANA)

Keywords:organic semiconductor, heterointerfece, disordering

In this work, we directly probed local structure of α-6T/F₁₆CuPc heterointerface, where the interface structure has been believed to be disordered, employing scanning tunneling microscopy (STM). The STM measurements revealed that α-6T molecules penetrate into the ordered F₁₆CuPc monolayer and a disorder phase is formed where α-6T and F₁₆CuPc are molecularly mixed. As a comparative experiment, we probed local structure of α-6T/CuPc heterointerface. The STM measurements revealed that the phase separation of α-6T and F₁₆CuPc was occurred. Therefore, it is considered the strength of intermolecular interaction is important to form the disorder phase. In this talk, we will discuss the effect of molecular size and flexibility on the disordered organic heterointerface by comparing the STM results of α-6T/F₁₆CuPc interface with 6P/F₁₆CuPc interface.