Dresden 2020 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Poster Session II
CPP 49.3: Poster
Tuesday, March 17, 2020, 14:00–16:00, P1A
Rotary Kelvin probe system to efficiently measure the giant surface potential ofpolarized organic films in completely dark condition — •Masahiro Ohara1, Tatsuya Watanabe2, Yuya Tanaka2,3, and Hisao Ishii2,3,4 — 1Fac. Eng. Chiba Univ. — 2GSSE Chiba Univ. — 3CFS Chiba Univ. — 4MCRC Chiba Univ.
Amorphous organic films often show orientation polarization with giant surface potential (GSP). The polarization due to GSP often affects device performance; however, the origin of anisotropic orientation is still not well understood. One of the factors that hinders understanding this phenomenon is the difficulty in Kelvin probe (KP) experiment. GSP have been investigated by using conventional KP method. In this method, the repeated cycles of KP measurements and film depositions are quite time-consuming. In addition, ambient light illumination to sample film cannot be avoided at the switching between measurement and deposition, and it reduces the GSP more or less due to the compensation by photo-generated carriers. In this study, we have developed a surface potential measurement apparatus using the ”Rotary KP method”. It can solve the above problems by rotating the reference electrode. Since the reference electrode does not always cover the sample, the surface potential can be measured continuously even during the film deposition. Thus, GSP values free from light illumination can be efficiently measured. We will report on the details of our apparatus with the results of the surface potential of TPBi film prepared from its methanol solution to compare with the GSP of the vacuum evaporated film.