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Title: Performance improvements in polymer nanofiber/fullerene solar cells with external electric field treatment
Authors: Solanki, Ankur
Wu, Bo
Salim, Teddy
Yeow, Edwin Kok Lee
Lam, Yeng Ming
Sum, Tze Chien
Keywords: DRNTU::Engineering::Materials::Organic/Polymer electronics
Issue Date: 2014
Source: Solanki, A., Wu, B., Salim, T., Yeow, E. K. L., Lam, Y. M., & Sum, T. C. (2014). Performance improvements in polymer nanofiber/fullerene solar cells with external electric field treatment. The journal of physical chemistry C, 118(21), 11285-11291.
Series/Report no.: The journal of physical chemistry C
Abstract: Organic solar cell (OSC) devices based on predominantly poly(3-hexylthiophene-2,5-diyl) (P3HT) nanofibers (NFs) exhibit inferior device performance compared to that of their conventional nanodomain P3HT:PCBM systems, which is credited to the low interfibrillar mobility between the NFs [Kurniawan, M.; et al. J. Phys. Chem. C2012, 116, 18015]. To improve the charge transport of these devices, external electric field (E-field) treatment of the active layer is performed in a bid to align the random polymer chains between the NFs perpendicular to the electrode. Extensive device testing revealed a 22.7% improvement in power conversion efficiency and higher mobilities (37.5% improvement) for the E-field-treated devices compared to those for the control. Transient absorption spectroscopy shows an improved initial generation of carriers and formation of polarons in the E-field-treated samples over those in the control samples in the femtosecond–nanosecond time scale. However, in the absence of any sweep-out voltage in the E-field-treated films, a higher recombination rate in the nanosecond–microsecond time scale is observed. Concomitant with the improved device efficiencies and higher mobilities measured in the E-field-treated devices and the higher recombination rate over the nanosecond–microsecond time scale in the E-field-treated films, we assert that the E-field treatment improved charge mobility and transport of P3HT-NF:PCBM through improved orientation of the polymer chains in the amorphous P3HT phase coexisting with the NFs.
DOI: 10.1021/jp5040097
Schools: School of Materials Science & Engineering 
School of Physical and Mathematical Sciences 
Rights: © 2014 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by The Journal of Physical Chemistry C, American Chemical Society. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [Article URL/DOI:].
Fulltext Permission: open
Fulltext Availability: With Fulltext
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SPMS Journal Articles

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