Thursday, May 2025

05:00 PM - 08:00 PM

Room: 220A

Session: OLED Posters

Effect of Substrate Temperature of n-type Charge-Generation Layer on the Electrical Properties of Charge-Generation Unit

Student

Description:

In this study, we investigated the impact of substrate temperature (Tsub) on the properties of the n-type charge generation layer (nCGL), which is composed of bathophenanthroline (Bphen) with 10 wt.% ytterbium (Yb), through deposition at different Tsub conditions of -4, 20, and 40 °C. The electrical properties of the charge generation unit (CGU) fabricated at -4 °C was better than those fabricated at 20, 40 °C Tsub, as we expected due to the formation of a more well-ordered horizontally oriented layer. To analyze the cause of the increase in electrical properties, we fabricated electron-only device (EOD) and observed the electron mobility of the nCGL fabricated in each Tsub conditions. In addition, more detail data including binding energies between the molecules and ionization potential energy difference at each conditions will also be presented. As a result, we confirm that the Tsub during deposition affects to the molecular anisotropy factor, carrier mobility, and ionization potential energy and we can improve the electrical performance of the CGU cell through low Tsub.