Tracking localised exciton formation in organic semiconductor material

Marios Maimaris; Allan J. Pettipher; Daniel J. Walke; Xijia Zheng; Andrei Gorodetsky; Pabitra Shakya Tuladhar; Helder Crespo; John W. G. Tisch; Artem Bakulin

doi:10.1117/12.2568527

21 August 2020 Tracking localised exciton formation in organic semiconductor material

Marios Maimaris, Allan J. Pettipher, Daniel J. Walke, Xijia Zheng, Andrei Gorodetsky, Pabitra Shakya Tuladhar, Helder Crespo, John W. G. Tisch, Artem Bakulin

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Proceedings Volume 11464, Physical Chemistry of Semiconductor Materials and Interfaces XIX; 114640C (2020) https://doi.org/10.1117/12.2568527
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Abstract

Here, using single-material OPV device and laser system with sub-10fs time resolution, we track in time the formation of localised excitonic states. For this we employ a combination of pump-probe (PP) spectroscopy, sensitive to concentration of excited states, and pump-push-photocurrent (PPPC) technique, sensitive to the state localisation. Combining both methods to monitor charge dynamics at real operation condition allows to separate and track the evolution of strongly bound and spontaneously dissociating excited states. Our data show that PP and PPPC measurement do not follow the same trend, and the discrepancy between the states probed by PP and PPPC indicates that excitons acquire localised character within first 50fs after formation. Results may be useful for a new realisation of efficient donor-acceptor OPV design.

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Marios Maimaris, Allan J. Pettipher, Daniel J. Walke, Xijia Zheng, Andrei Gorodetsky, Pabitra Shakya Tuladhar, Helder Crespo, John W. G. Tisch, and Artem Bakulin "Tracking localised exciton formation in organic semiconductor material", Proc. SPIE 11464, Physical Chemistry of Semiconductor Materials and Interfaces XIX, 114640C (21 August 2020); https://doi.org/10.1117/12.2568527

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KEYWORDS

Excitons

Organic semiconductors

Solar energy

Absorption

Data acquisition

Energy efficiency

Laser systems engineering

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