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
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).
|Subjects:||Physical Science > Nanoelectronics|
Technology > Nanotechnology and energy applications
|Deposited By:||M T V|
|Deposited On:||24 Dec 2008 15:13|
|Last Modified:||24 Dec 2008 15:13|
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