Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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Steady-State and Transient Response Analysis of DSSC Based on Electron Diffusion Coefficient and Chemical Capacitance

  • J. C. Gallegos (Centro de Fisica Aplicada y Tecnologia Avanzada, Universidad Nacional Autonoma de Mexico) ;
  • J. Manriquez (Centro de Investigacion y Desarrollo Tecnologico en Electroquimica S.C.) ;
  • R. Rodriguez (Centro de Fisica Aplicada y Tecnologia Avanzada, Universidad Nacional Autonoma de Mexico) ;
  • S. Vargas (Centro de Fisica Aplicada y Tecnologia Avanzada, Universidad Nacional Autonoma de Mexico) ;
  • D. Rangel (Centro de Fisica Aplicada y Tecnologia Avanzada, Universidad Nacional Autonoma de Mexico)
  • Received : 2023.09.01
  • Accepted : 2023.12.12
  • Published : 2024.05.31
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Abstract

A study of the transition from transitory state to steady state in DSSCs based on natural dyes is presented; cochineal was used as dye and Li+, Na+, and K+ were the ions added to the electrolyte. The photocurrent profiles were obtained as a function of time. Several DSSCs were prepared with different cations and their role and the transitory-to-steady transition was determined. A novel hybrid charge carrier source model based on the Heaviside function H(t) and the Lambert-Beer law, was developed and applied to analysis of the transient response of the output photocurrent. Additionally, the maximum effective light absorption coefficient α and the electronic extraction rate κ for each ion were determined: ${\alpha}_{Li^+,Na^+,K^+}\,=\,(0.486,\,0.00085,\,0.1126)\,cm^{-1}$, and also the electronic extraction rate ${\kappa}^{Li^+,Na^+,K^+}_{ext.}\,=\,(1410,\,19.07,\,19.69)\,cm\,s^{-1}$. The impedance model using Fick's second law was developed for carrier recombination to characterize the photocurrent.

Keywords

Acknowledgement

To the personnel of the Light Scattering Laboratory and the Instrumentation Laboratory of the Center for Applied Physics and Advanced Technology of UNAM campus Juriquilla, Queretaro for facilitating the extraction of natural organic pigments and the performance of electrical measurements on the DSSCs, respectively. Also, to the staff of the Photoelectrochemistry Laboratory at the Center for Research and Technological Development in Electrochemistry in Queretaro, for facilitating the electrochemical tests. Juan Carlos Gallegos Mendoza would like to thank the "Consejo Nacional de Ciencia y Tecnologia" for the grant awarded for the development of this project.

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