Journal
NANO LETTERS
Volume 11, Issue 12, Pages 5316-5321Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl202796u
Keywords
Carbon nanotube; P3HT; organic photovoltaics; open-circuit voltage; dark saturation current
Categories
Funding
- Eni S.p.A. under the Eni-MIT Alliance
- National Science Foundation [DMR - 0213282]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [819762] Funding Source: National Science Foundation
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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.
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