1 May 2012 Exploring the exciton dissociation process at a donor-acceptor heterojunction in both time and space via an induced Stark shift
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Proceedings Volume 8435, Organic Photonics V; 84350L (2012); doi: 10.1117/12.924154
Event: SPIE Photonics Europe, 2012, Brussels, Belgium
Abstract
The dissociation of excitons at a donor-acceptor interface in organic photovoltaic devices is an important but poorly understood process that takes place over multiple length and time scales. Here, we introduce a method to resolve photoinduced charge movement at an organic heterojunction in both time and space through observation of the Stark shift induced in a nearby J-aggregate probe layer. Using ultrafast transient absorption measurements, we show that this technique provides an opportunity to quantify the recombination and separation dynamics of geminate charge pairs over the entire sub-picosecond to millisecond range of relevant time scales.
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Noel C. Giebink, Barry P. Rand, David Cheyns, Jan Genoe, "Exploring the exciton dissociation process at a donor-acceptor heterojunction in both time and space via an induced Stark shift", Proc. SPIE 8435, Organic Photonics V, 84350L (1 May 2012); doi: 10.1117/12.924154; https://doi.org/10.1117/12.924154
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KEYWORDS
Absorption

Excitons

Heterojunctions

Data modeling

Gold

Picosecond phenomena

Interfaces

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