Hui-Ping Wu

Publications (3)9.74 Total impact

• Article: 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, Eric Wei-Guang Diau
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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 (V) 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 (J) slightly for YD12 (from 17.65 to 17.19 mA cm) but it led to a significant reduction for YD12CN (from 16.45 to 9.78 mA cm). 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.
  Physical Chemistry Chemical Physics 03/2013; 15(13):4651-5. · 3.57 Impact Factor
• Article: Design and characterization of alkoxy-wrapped push-pull porphyrins for dye-sensitized solar cells.

  Teresa Ripolles-Sanchis, Bo-Cheng Guo, Hui-Ping Wu, Tsung-Yu Pan, Hsuan-Wei Lee, Sonia R Raga, Francisco Fabregat-Santiago, Juan Bisquert, Chen-Yu Yeh, Eric Wei-Guang Diau
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  ABSTRACT: Three alkoxy-wrapped push-pull porphyrins were designed and synthesized for dye-sensitized solar cell (DSSC) applications. Spectral, electrochemical, photovoltaic and electrochemical impedance spectroscopy properties of these porphyrin sensitizers were well investigated to provide evidence for the molecular design.
  Chemical Communications 03/2012; 48(36):4368-70. · 6.17 Impact Factor
• Source

  Available from: Eric Diau

  Article: Porphyrin Dyes with High Injection and Low Recombination for Highly Efficient Mesoscopic Dye-Sensitized Solar Cells

  Eva M. Barea, Victoria Gónzalez-Pedro, Teresa Ripollés-Sanchis, Hui-Ping Wu, Lu-Lin Li, Chen-Yu Yeh, Eric Wei-Guang Diau, Juan Bisquert
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  ABSTRACT: The photovoltaic performance and charge recombination characteristics of porphyrin-based dye-sensitized solar cell (DSC) devices have been investigated using the impedance spectroscopy (IS) technique. The IS results provide key information related to the device performance for a highly efficient porphyrin dye (YD2), a reference porphyrin dye (YD0), and a commercial ruthenium dye (N719). The DSC devices constructed using YD2 and N719 dyes reach similar internal power conversion efficiencies (7.41% vs 7.54%) due to the higher injection of the YD2 dye that is compromised by a lower photovoltage. In addition, both YD2 and N719 dyes exhibit the same charge-transfer resistance, indicating that the recombination rates of both dyes are very similar. The diarylamino group plays a key role to repel the triiodide ions from the titania surface so that the charge recombination of YD2 is less significant compared with that of YD0.
  05/2011;
• Article: Effects of aggregation and electron injection on photovoltaic performance of porphyrin-based solar cells with oligo(phenylethynyl) links inside TiO2 and Al2O3 nanotube arrays

  Liyang Luo, Chia-Jung Lin, Chiau-Yiag Tsai, Hui-Ping Wu, Lu-Lin Li, Chen-Fu Lo, Ching-Yao Lin, Eric Wei-Guang Diau
  Physical Chemistry Chemical Physics - PHYS CHEM CHEM PHYS. 01/2010; 12(5).