Synthesis of n‐type [60]Fullerene Derivatives with Sterically Bulky tert ‐Butyl Groups for Vacuum Deposition Processes

Autor: Hiromasa Shibuya, Yeong Suk Choi, Taejin Choi, Sungyoung Yun, Juhee Moon, Yutaka Matsuo
Rok vydání: 2022
Předmět:
Zdroj: Chemistry – An Asian Journal. 17
ISSN: 1861-471X
1861-4728
Popis: [60]Fullerene derivatives with high thermal stability can be used for vacuum deposition under heating to fabricate thin films for organic electronic devices. Here, we investigated the thermal stability of [60]fullerene derivatives with various bulky substituents for thermal evaporation under vacuum by means of thermogravimetric analysis under reduced and normal pressure. We found sterically bulky groups such as tert-butyl groups of [60]fullerene derivatives lowered the vacuum deposition temperature. Also, we performed isothermal thermogravimetric analysis to examine the long-term thermal stability of the designed compounds under heating conditions. Furthermore, we investigated the UV-Vis absorption patterns of the deposited films. Absorption in the blue wavelength range, which was attributed to intermolecular HOMO-LUMO transitions among the molecular orbitals of adjacent [60]fullerenes, was dramatically modified. These results were associated with the prevention of aggregation among neighboring [60]fullerene by the sterically bulky groups. This concept could contribute to expanding the use of evaporable [60]fullerene derivatives in organic thin-film electronics research fields.
Databáze: OpenAIRE
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