Carbon nanotube effects on electroluminescence and photovoltaic response in conjugated polymers

Zhihua Xu, Yue Wu, Bin Hu, Ilia N. Ivanov, David B. Geohegan

Research output: Contribution to journalArticle

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Abstract

This letter reports the experimental results of enhanced electroluminescence (EL) and photovoltaic (PV) response upon doping single-wall carbon nanotubes (SWNTs) into conjugated polymer poly[2-methoxy-5- (2′ -ethylhexyloxy)-1, 4-phenylenevinylene] (MEHPPV) based on single-layer light-emitting diodes. We found that the dispersed SWNTs result in two processes: charge transport and exciton dissociation at the tube-chain interface in the SWNT/polymer composites. The detailed EL and PV studies indicate that low SWNT doping concentrations mainly improve the bipolar charge injection, leading to enhanced both reverse and forward EL with reduced threshold voltage. As the SWNT doping concentration continues to increase, the interfacial exciton dissociation becomes dominated, giving rise to an increased PV response. This SWNT concentration-dependent charge transport and exciton dissociation present a pathway to individually address the dual EL and PV functionalities of SWNT-doped polymer composites by controlling the doping level of the SWNTs.

Original languageEnglish (US)
Article number263118
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume87
Issue number26
DOIs
StatePublished - Dec 1 2005

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electroluminescence
carbon nanotubes
polymers
excitons
dissociation
composite materials
threshold voltage
light emitting diodes
injection
tubes

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Carbon nanotube effects on electroluminescence and photovoltaic response in conjugated polymers. / Xu, Zhihua; Wu, Yue; Hu, Bin; Ivanov, Ilia N.; Geohegan, David B.

In: Applied Physics Letters, Vol. 87, No. 26, 263118, 01.12.2005, p. 1-3.

Research output: Contribution to journalArticle

Xu, Zhihua ; Wu, Yue ; Hu, Bin ; Ivanov, Ilia N. ; Geohegan, David B. / Carbon nanotube effects on electroluminescence and photovoltaic response in conjugated polymers. In: Applied Physics Letters. 2005 ; Vol. 87, No. 26. pp. 1-3.
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