Скачать или смотреть How Electron Delocalization Can Help to Turn Light into Electricity

Dr. Wai Lun Chan
2019 9 9
University of Kansas, Department of Physics

How electron delocalization can help to turn light into electricity in organic and low-dimensional materials:
In organic and low dimensional semiconductors, optical excitation does not necessarily produce free carriers. Very often, electron and hole are bound together to form a neutral quasiparticle called an exciton because of the reduced electronic screening. Releasing the charges from the exciton is particularly important for the functioning of photovoltaics, light sensors, and photo-catalyst, but it is a bottleneck process because of the high binding energy of excitons. I will present our recent works on organic/organic and organic/two-dimensional crystal interfaces. I will discuss how various factors such as the local potential energy landscape, electron delocalization originated from quantum mechanical interaction, entropy, and structural anisotropy can affect the exciton dissociation dynamics. These understandings are important for designing nanoscale structures that can turn light into electricity in an effective manner.