Who: S. Ismat Shah (Physics and Astronomy, Materials Science and Engineering, Univ. of Delaware, Newark, USA)
Place: CFM Auditorium
Date: Tuesday, 23 January 2018, 12:00
Surfaces and Interfaces in organic bulk-heterojunction solar cells
S. Ismat Shah
Physics and Astronomy, Materials Science and Engineering
University of Delaware, Newark DE 19716
Solution-processed organic solar cells (OSC) could possibly be an economical alternative to the conventional photovoltaic technology owing primarily to the fact that a totally non-vacuum technology could be developed. However, there are still performance and stability issues that currently limit OSC application. These issues are related to the device materials and processing. Since phase separation between the electron donor and electron acceptor is a required step during fabrication, achieved by annealing the films, the device efficiency is limited by domain sizes which affects carrier collection. Collection, in turn, is controlled by the life time and mobility of the carriers. This talk will focus on the morphology evolution of the active layer of organic bulk-heterojunction solar cells in connection with the carrier collection and efficiency optimization. Interdiffusion is also a critical factor determining OSC device performance. I will describe how we can quantitatively determine interdiffusion, particularly that of the contacts material and the active layer.