Carrier dynamics in polymer nanofiber : fullerene solar cells

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Carrier dynamics in polymer nanofiber : fullerene solar cells

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Title: Carrier dynamics in polymer nanofiber : fullerene solar cells
Author: Kurniawan, Michael; Salim, Teddy; Tai, Kong Fai; Sun, Shuangyong; Sie, Edbert Jarvis; Wu, Xiangyang; Yeow, Edwin Kok Lee; Huan, Alfred Cheng Hon; Lam, Yeng Ming; Sum, Tze Chien
Copyright year: 2012
Abstract: Organic photovoltaic (OPV) devices fabricated with P3HT nanofiber (NF) networks typically exhibit poorer device performance compared to their nanoscale phase separated P3HT:PCBM counterparts despite possessing superior light harvesting properties and high in-plane charge mobility. Herein, we investigate the charge generation and recombination dynamics in P3HT-NF:PCBM blend films using transient absorption spectroscopy (TAS) spanning a wide temporal range over 7 orders of magnitude (i.e., from 100 fs to 1 μs), which are correlated with device performance studies. TAS reveals a more efficient charge generation and polaron formation rate in the NF samples as compared to the control samples at the onset which persists up to 2 ns. However, within the nanoseconds to microseconds time scale, there is a significant amount of nongeminate recombination in the NF system. We attribute this to the poor interfibrillar charge transport between the NFs, which tend to align parallel to the electrodes, thereby causing charge localization. These charge dynamics were validated using the analytical model proposed by Laquai and co-workers [Howard, I. A.; et al. J. Am. Chem. Soc.2010, 132, 14866]. Importantly, our findings provide new insights into the factors that limit the photovoltaic performance of such P3HT-NF based devices.
Subject: DRNTU::Engineering::Materials
Type: Journal Article
Series/ Journal Title: Journal of physical chemistry C
School: School of Materials Science and Engineering
Rights: © 2012 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by 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: [DOI: http://dx.doi.org/10.1021/jp302968e].
Version: Accepted version

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