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Surfaces and Interfaces in organic bulk-heterojunction solar cells

Tuesday, January 23, 2018 - 12:00
Place: 
CFM Auditorium
Who: 
S. Ismat Shah (Physics and Astronomy, Materials Science and Engineering, Univ. of Delaware, Newark, USA)
Source Name: 
CFM


Surfaces
and Interfaces in organic bulk-heterojunction solar cells

S. Ismat Shah

Professor

Physics and
Astronomy, Materials Science and Engineering

University
of Delaware, Newark DE 19716

USA

 

Abstract:

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.

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