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Title: P3HT based solution-processed pseudo bi-layer organic solar cell with enhanced performance
Authors: Thummalakunta, L.N.S.A.
Yong, C.H.
Ananthanarayanan, K. 
Luther, J. 
Keywords: ICBA
Organic solar cells
Pseudo bi-layer
Thermal annealing
Issue Date: Oct-2012
Citation: Thummalakunta, L.N.S.A., Yong, C.H., Ananthanarayanan, K., Luther, J. (2012-10). P3HT based solution-processed pseudo bi-layer organic solar cell with enhanced performance. Organic Electronics: physics, materials, applications 13 (10) : 2008-2016. ScholarBank@NUS Repository.
Abstract: We present a solution-processed pseudo bi-layer organic solar cell with poly(3-hexyl thiophene) (P3HT) as donor and indene-C 60 bisadduct (ICBA) as acceptor. The devices were fabricated by sequential processing of the active components followed by a thermal annealing treatment. An efficiency of 5.9% was achieved under AM 1.5G irradiation (1000 W/m 2). The obtained efficiency is attributed to an enhanced nanomorphology that arises from the inter-diffusion of the ICBA molecules into a layer of pre-organised polymer (P3HT) and also due to the subsequent crystallisation of the ICBA molecules. These processes facilitate efficient charge generation and extraction. Time of flight-secondary ion mass spectroscopy (TOF-SIMS) depth profiling was carried out for different thermal annealing treatments of these pseudo bi-layer devices, which reveals full inter-diffusion of ICBA into the polymer P3HT. Photo-CELIV (charge extraction by linearly increasing voltage) studies elucidates that the thermal annealing imparts crystallinity to the fullerene phase which results in the improvement of charge carrier mobility. © 2012 Elsevier B.V. All rights reserved.
Source Title: Organic Electronics: physics, materials, applications
ISSN: 15661199
DOI: 10.1016/j.orgel.2012.05.054
Appears in Collections:Staff Publications

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