Nano Archive

Hierarchical placement and associated optoelectronic impact of carbon nanotubes in polymer-fullerene solar cells

Chaudhary, Sumit and Lu, Haiwei and Muller, Astrid M. and Bardeen, Christopher J. and Ozkan, Mihrimah (2007) Hierarchical placement and associated optoelectronic impact of carbon nanotubes in polymer-fullerene solar cells. NANO LETTERS, 7 (7). pp. 1973-1979. ISSN 1530-6984

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Official URL: http://pubs.acs.org/doi/abs/10.1021/nl070717l

Abstract

Since their discovery, carbon nanotubes (CNTs) have been considered to be promising candidates for polymer-based solar cells, but their functional incorporation and utilization in such devices have been limited due to processing bottlenecks. Here, we demonstrate the realization of controlled placement of a single-walled CNT (SWNT) monolayer network at four different positions in polymer-fullerene bulk-heterojunction (BHJ) solar cells. SWNTs were deposited by dip-coating from a hydrophilic suspension, and a very brief, largely nondestructive argon plasma treatment of the active layer was utilized for incorporation of a SWNT layer within or above it. We demonstrate that SWNTs on the hole-collection side of the active layer lead to an increase in power conversion efficiency (PCE) of the photovoltaic devices from 4 to 4.9% (under AM 1.5 G, 1.3 suns illumination). This is the highest reported PCE for polymer-based solar cells incorporating CNTs, upon consideration of expected scaling of device parameters for 1 sun illumination. We also observe that SWNTs deposited on the top of the active layer lead to major electro-optical changes in the device functionality, including an increased fluorescence lifetime of poly-3-hexylthiophene (P3HT).

Item Type:Article
Subjects:Physical Science > Nanoelectronics
Technology > Nanotechnology and energy applications
ID Code:2176
Deposited By:M T V
Deposited On:24 Dec 2008 15:13
Last Modified:24 Dec 2008 15:13

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