Enhanced photovoltaic performance with co-sensitization of porphyrin and an organic dye in dye-sensitized solar cells

Chi Ming Lan, Hui Ping Wu, Tsung Yu Pan, Chia Wei Chang, Wei Shan Chao, Chien Tien Chen, Chin Li Wang, Ching Yao Lin, Eric Wei Guang Diau

Research output: Contribution to journalArticlepeer-review

171 Citations (Scopus)


We designed a stepwise approach for co-sensitization of a zinc porphyrin sensitizer (LD12) with a spirally configured organic dye (CD5) for dye-sensitized solar cells. The co-sensitized LD12 + CD5 device showed significantly enhanced VOC and JSC relative to its individual single-dye sensitized devices. Upon optimization, the device made of the LD12 + CD5 system yielded JSC/mA cm-2 = 16.7, V OC/V = 0.74, FF = 0.73 and η = 9.0%; this performance is superior to that of either individual device made from LD12 (η = 7.5%) and CD5 (η = 5.7%) under the same conditions of fabrication. To understand the effects of the potential shift and charge recombination on the cell performance, we measured charge-extraction (CE) and intensity-modulated photovoltage spectra (IMVS). Upon sensitization with each dye, the TiO2 potentials are similar, but co-sensitization causes the potential to shift down (cathodic shift). Charge recombination was significantly retarded for the co-sensitized system relative to each individual dye-sensitized system, to account for the enhanced VOC for the former relative to the latter. A test of stability indicates a systematic trend between the LD12 + CD5 and LD12 devices; the performance of the co-sensitized device degraded only ∼15% and remained stable during the period of 500-1000 h near 295 K.

Original languageEnglish
Pages (from-to)6460-6464
Number of pages5
JournalEnergy and Environmental Science
Issue number4
Publication statusPublished - Jan 1 2012
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Chemistry
  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Pollution


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