| Autor: |
Rui-Qi Png1, Perq-Jon Chia1, Jie-Cong Tang2, Bo Liu1, Sivaramakrishnan, Sankaran1, Mi Zhou1, Siong-Hee Khong3, Chan, Hardy S. O.2, Burroughes, Jeremy H.4, Lay-Lay Chua1,2,3 chmcll@nus.edu.sg, Friend, Richard H.1,3 rhf10@cam.ac.uk, Ho, Peter K. H.1 phyhop@nus.edu.sg |
| Předmět: |
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| Zdroj: |
Nature Materials. Feb2010, Vol. 9 Issue 2, p152-158. 7p. 1 Diagram, 4 Graphs. |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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