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Title: Carrier dynamics in polymer nanofiber : fullerene solar cells
Authors: 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
Keywords: DRNTU::Engineering::Materials
Issue Date: 2012
Source: Kurniawan, M., Salim, T., Tai, K. F., Sun, S., Sie, E. J., Wu, X., et al. (2012). Carrier dynamics in polymer nanofiber : fullerene solar cells. Journal of Physical Chemistry C, 116(34), 18015–18022.
Series/Report no.: Journal of physical chemistry C
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.
DOI: 10.1021/jp302968e
Schools: School of Materials Science & 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:].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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