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关于举行佐治亚理工学院陈先凯博士学术报告的通知

时间:2019-01-09 09:01      发布人:何秋云      阅读:115

报告题目:Charge-Transfer (CT) Electronic States in Organic π-Conjugated Materials for Photoelectric Energy Conversion

报 告 人:陈先凯 博士(佐治亚理工学院)

邀 请 人:顾成 教授

报告时间:2019年1月14日(周一) 上午10:00

报告地点:北区发光材料与器件国重502会议室

 

报告简介:

Since the introduction of the bulk-heterojunction architecture in the mid-1990s, in which the electron-donor (D) and electron-acceptor (A) components are blended, the efficiency of organic solar cells (OSCs) has steadily increased. A critical component of any bulk heterojunction is the appearance of inter-molecular charge-transfer (CT) electronic states at their D-A interfaces. These electronic states play a determining role in the photo-physical processes that transform the energy of the absorbed sunlight into electrical power. Here, we have illustrated how factors such as the details of the molecular packing at the D-A interfaces, the electronic polarization effects, and the extent of electron/hole delocalization around the interface impact the nature of the CT states. Moreover, we have also discussed how the hybridization between the CT and exciton states impacts the spectroscopy characteristics of D-A blends, the recombination rates and consequently the voltage losses, which need to be minimized.
In addition, intra-molecular CT states play an important role in the photo-physical processes and eventual device performances of OLED materials based on thermally activated delayed florescence (TADF) emitters. Here, we have also shed light on how the energy levels and excitation characters of intra-molecular CT states impact electronic-structure parameters such as singlet-triplet energy gap, spin-orbit coupling, transition dipole moment, and thus reverse intersystem crossing and radiative decay processes.