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Toward Efficient Carbon Nanotube/P3HT Solar Cells: Active Layer Morphology, Electrical, and Optical Properties

Ren, Shenqiang and Bernardi, Marco and Lunt, Richard R. and Bulovic, Vladimir and Grossman, Jeffrey C. and Gradečak, Silvija (2011) Toward Efficient Carbon Nanotube/P3HT Solar Cells: Active Layer Morphology, Electrical, and Optical Properties. Nano Letters, 11 (12). pp. 5316-5321. ISSN 1530-6984. doi:10.1021/nl202796u.

[img] PDF (List of materials used. Absorption spectrum of pristine SWCNTs. I–V curves. Experimental details of the quantum efficiency measurements. List of s-SWCNTs with diameter in the range 1.2–1.7 nm) - Supplemental Material
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We demonstrate single-walled carbon nanotube (SWCNT)/P3HT polymer bulk heterojunction solar cells with an AM1.5 efficiency of 0.72%, significantly higher than previously reported (0.05%). A key step in achieving high efficiency is the utilization of semiconducting SWCNTs coated with an ordered P3HT layer to enhance the charge separation and transport in the device active layer. Electrical characteristics of devices with SWCNT concentrations up to 40 wt % were measured and are shown to be strongly dependent on the SWCNT loading. A maximum open circuit voltage was measured for SWCNT concentration of 3 wt % with a value of 1.04 V, higher than expected based on the interface band alignment. Modeling of the open-circuit voltage suggests that despite the large carrier mobility in SWCNTs device power conversion efficiency is governed by carrier recombination. Optical characterization shows that only SWCNT with diameter of 1.3–1.4 nm can contribute to the photocurrent with internal quantum efficiency up to 26%. Our results advance the fundamental understanding and improve the design of efficient polymer/SWCNTs solar cells.

Item Type:Article
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URLURL TypeDescription Information
Bernardi, Marco0000-0001-7289-9666
Grossman, Jeffrey C.0000-0003-1281-2359
Additional Information:© 2011 American Chemical Society. Received: August 12, 2011; Revised: October 19, 2011; Published: October 24, 2011. This work was supported by Eni S.p.A. under the Eni-MIT Alliance Solar Frontiers Program. The authors acknowledge access to Shared Experimental Facilities provided by the MIT Center for Materials Science Engineering supported in part by MRSEC Program of National Science Foundation under award number DMR - 0213282.
Funding AgencyGrant Number
Eni-MIT Alliance Solar Frontiers ProgramUNSPECIFIED
Subject Keywords:Carbon nanotube, P3HT, organic photovoltaics, open-circuit voltage, dark saturation current
Issue or Number:12
Record Number:CaltechAUTHORS:20150923-133855451
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Official Citation:Toward Efficient Carbon Nanotube/P3HT Solar Cells: Active Layer Morphology, Electrical, and Optical Properties Shenqiang Ren, Marco Bernardi, Richard R. Lunt, Vladimir Bulovic, Jeffrey C. Grossman, and Silvija Gradečak Nano Letters 2011 11 (12), 5316-5321 DOI: 10.1021/nl202796u
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:60443
Deposited By: Tony Diaz
Deposited On:23 Sep 2015 20:48
Last Modified:10 Nov 2021 22:34

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