第6回物理工学科教室談話会[Dr. Guillaume Schweicher・9/26(金)14:00～15:00]

講　師：Dr. Guillaume Schweicher
所　属：Universite Libre de Bruxelles (ULB) （ブリュッセル自由大学）
題　目：Structure-Property Relationships in Thienoacenes for Improved Transport Properties
日　時：2025 年 9 月 26 日(金)14:00～15:00
Date and Time:  September 26, 2025 (Friday) 14:00-15:00
場　所：工 6 号館 1 階 大会議室
Place: Large Conference room, 1st floor, Engineering Bldg. 6

Abstract:
In spite of tremendous progress in molecular design, engineering and processing, only few small molecule organic semiconductors (OSCs) have reached charge carrier mobilities (μ) higher than 10 cm2 /Vs, typically with single-crystal devices. However, μ is a material property and not a molecular one. It is thus of paramount importance to take supramolecular order into consideration at all length scales. As recently evidenced, the best OSCs tend to self-organize into large plate-like single-crystals exhibiting a layer-by-layer herringbone packing motif.1 Moreover, thermal lattice fluctuations cause temporal variations of transfer integrals (J) and impose a transient localization of charges leading to reduced macroscopic μ in these weakly bonded van der Waals solids.2 We will present recent progress achieved in our group in terms of molecular design and understanding of the impact of thermal energetic disorder: design by theory, crystal engineering, quantum-chemical calculations and evaluation of transport properties in electronic devices.

References
[1] Schweicher, Adv. Mater. 2020, 32, 10, 1905909; Fratini, Nature Materials 2020, 19, 491.
[2] Fratini, Adv. Funct. Mater. 2016, 26, 2292; Fratini, Nature Materials 2017, 16, 998; Schweicher, Adv. Mater. 2019, 31, 43, 1902407; Banks, Adv. Funct. Mater. 2023, 33, 38, 2303701; Giannini, Acc. Chem. Res. 2022, 55, 6, 819; Giannini, Di Virgilio, Nature Materials 2023, 22, 1361; Peluzo, Angewandte Chemie 2025, 64, 26, e202507566.

紹介教員：長谷川達生教授（物理工学専攻）、山本倫久教授（量子相ｴﾚｸﾄﾛﾆｸｽ研究ｾﾝﾀｰ）