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

Yu Cheng Chang, Hui Ping Wu, Nagannagari Masi Reddy, Hsuan Wei Lee, Hsueh Pei Lu, Chen Yu Yeh*, Wei-Guang Diau

*Corresponding author for this work

Research output: Contribution to journalArticle

29 Scopus citations

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.

Original languageEnglish
Pages (from-to)4651-4655
Number of pages5
JournalPhysical Chemistry Chemical Physics
Volume15
Issue number13
DOIs
StatePublished - 7 Apr 2013

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