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关于举行上海交通大学陈振沣博士学术报告的通知

时间:2019-11-27 11:54      发布人:何秋云      阅读:90

报告题目:Charge generation process in non-fullerene acceptor based OPV devices

报  告  人:陈振沣博士(上海交通大学)

报告时间:2019年12月5日(周四)上午9:30

报告地点:北区科技园1号楼发光材料与器件国家重点实验室502会议室

Abstract

Non-fullerene acceptors (NFA), both molecular and polymeric organic materials, are considered as an alternative to the commonly applied fullerene derivative, PCBM for organic photovoltaic (OPV) application, owing to its potentially low cost of production and tuneable absorption region that could complement donor absorption region. Along with the successful effort in material designs, the efficiency for NFA based OPV devices has improved greatly, due partly to the complementary absorption of donor and NFA which results in a higher current density generated at applied bias during a J-V curve scan. Nevertheless, the charge generation process in such devices is not extensively explored and understood. In order understand the charge generation process in such devices, blend films made with NFAs IDTBR and FTB/FTTB were studied with femto/micro-second transient absorption spectroscopies (fs/µs-TAS) and different spectroscopic measurements. Through different means to alter the charge generation process, including energetic tuning, the improvement in the current density of OPV devices made with NFAs IDTBR and FTB/FTTB is explained. A correlation between charge generation efficiency and energetic offset is established with the study of 3 series of polymer blend systems, PBDTTT-EFT (PCE10) and PffBT4T-2OD (PCE11) and the benchmark polymer, P3HT.

Personal  profile

Dr. Ching-Hong Tan is currently a post-doc at Shanghai JiaoTong University. His current research focuses on understanding the charge generation processes in different applications of organic photovoltaic (OPV) devices. Prior to this, He completed his PhD, as well as his MRes, with FRS Prof. James Durrant at Imperial College London, understanding the charge generation process in non-fullerene acceptor (NFA) based OPV systems. He has worked with fs-TAS and µs-TAS, among many other instruments such as SEM and TEM. He is interested in understanding the photophysical processes of electrons and holes in blends made with organic and other semiconducting materials such as perovskite.