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Title: High-performance polymer semiconducting heterostructure devices by nitrene-mediated photocrosslinking of alkyl side chains
Authors: Png, R.-Q. 
Chia, P.-J. 
Tang, J.-C. 
Liu, B. 
Sivaramakrishnan, S. 
Zhou, M. 
Khong, S.-H.
Chan, H.S.O. 
Burroughes, J.H.
Chua, L.-L. 
Friend, R.H. 
Ho, P.K.H. 
Issue Date: Feb-2010
Citation: Png, R.-Q., Chia, P.-J., Tang, J.-C., Liu, B., Sivaramakrishnan, S., Zhou, M., Khong, S.-H., Chan, H.S.O., Burroughes, J.H., Chua, L.-L., Friend, R.H., Ho, P.K.H. (2010-02). High-performance polymer semiconducting heterostructure devices by nitrene-mediated photocrosslinking of alkyl side chains. Nature Materials 9 (2) : 152-158. ScholarBank@NUS Repository.
Abstract: Heterostructures are central to the efficient manipulation of charge carriers, excitons and photons for high-performance semiconductor devices. Although these can be formed by stepwise evaporation of molecular semiconductors, they are a considerable challenge for polymers owing to re-dissolution of the underlying layers. Here we demonstrate a simple and versatile photocrosslinking methodology based on sterically hindered bis(fluorophenyl azide)s. The photocrosslinking efficiency is high and dominated by alkyl side-chain insertion reactions, which do not degrade semiconductor properties. We demonstrate two new back-infiltrated and contiguous interpenetrating donor-acceptor heterostructures for photovoltaic applications that inherently overcome internal recombination losses by ensuring path continuity to give high carrier-collection efficiency. This provides the appropriate morphology for high-efficiency polymer-based photovoltaics. We also demonstrate photopatternable polymer-based field-effect transistors and light-emitting diodes, and highly efficient separate-confinement-heterostructure light-emitting diodes. These results open the way to the general development of high-performance polymer semiconductor heterostructures that have not previously been thought possible. © 2010 Macmillan Publishers Limited. All rights reserved.
Source Title: Nature Materials
ISSN: 14761122
DOI: 10.1038/nmat2594
Appears in Collections:Staff Publications

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