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Issue 13, 2013
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The influence of electron injection and charge recombination kinetics on the performance of porphyrin-sensitized solar cells: effects of the 4-tert-butylpyridine additive

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Abstract

The effects of the 4-tert-butylpyridine (TBP) additive in the electrolyte on photovoltaic performance of two push–pull porphyrin sensitizers (YD12 and YD12CN) were examined. Addition of TBP significantly increased the open-circuit voltage (VOC) for YD12 (from 550 to 729 mV) but it was to a lesser extent for YD12CN (from 544 to 636 mV); adding TBP also had the effect of reducing the short-circuit current density (JSC) slightly for YD12 (from 17.65 to 17.19 mA cm−2) but it led to a significant reduction for YD12CN (from 16.45 to 9.78 mA cm−2). The resulting power conversion efficiencies of the YD12 devices increase from 6.2% to 8.5% whereas those of the YD12CN devices decrease from 5.8% to 4.5%. Based on measurements of temporally resolved photoelectric transients of the devices and femtosecond fluorescence decays of thin-film samples, the poor performance of the YD12CN device in the presence of TBP can be understood as being due to the enhanced charge recombination, decreased electron injection, and a lesser extent of inhibition of the intermolecular energy transfer.

Graphical abstract: The influence of electron injection and charge recombination kinetics on the performance of porphyrin-sensitized solar cells: effects of the 4-tert-butylpyridine additive

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Supplementary files

Article information


Submitted
17 Dec 2012
Accepted
04 Feb 2013
First published
05 Feb 2013

Phys. Chem. Chem. Phys., 2013,15, 4651-4655
Article type
Paper

The influence of electron injection and charge recombination kinetics on the performance of porphyrin-sensitized solar cells: effects of the 4-tert-butylpyridine additive

Y. Chang, H. Wu, N. M. Reddy, H. Lee, H. Lu, C. Yeh and E. W. Diau, Phys. Chem. Chem. Phys., 2013, 15, 4651
DOI: 10.1039/C3CP44555K

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