Effects of polymer chemistry on polymer-electrolyte dye sensitized solar cell performance: A theoretical and experimental investigation

Yuriy Y. Smolin, Siamak Nejati, Mona Bavarian, Daeyeon Lee, Kenneth K.S. Lau, Masoud Soroush

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

The effects of polymer chemistry on interfacial properties and overall performance in polymer-electrolyte dye sensitized solar cells (DSSCs) are investigated theoretically and experimentally. Specifically, polymer electrolytes based on poly(2-hydroxyethyl methacrylate) (PHEMA), poly(glycidyl methacrylate) (PGMA), and poly(4-vinylpyridine) (P4VP) are considered. These polymers are grown directly within the mesoporous TiO2 photoanode via a single step polymerization and coating using initiated chemical vapor deposition (iCVD) to maximize pore filling. The experimental study coupled with a 1-D first-principles macroscopic DSSC mathematical model provides insight into the cell interfacial processes and overall performance. Parameter estimation using the macroscopic model indicates that the pendant groups on the polymers strongly affect the conduction band position of TiO2, the back electron transfer at the photoanode-electrolyte interface, and the exchange current density at the platinum cathode. The estimated difference between the TiO2 conduction band edge and the redox potential of the electrolyte are 0.87, 0.99 and 1.06 eV for P4VP, PGMA, and PHEMA, respectively. Estimated recombination rate constants for P4VP and PGMA are respectively 54% and 19% lower than that of PHEMA. This study indicates that by varying polymer electrolyte chemistry, DSSC characteristics including open-circuit voltage, short-circuit current density, and fill factor can be tuned.

Original languageEnglish (US)
Pages (from-to)156-164
Number of pages9
JournalJournal of Power Sources
Volume274
DOIs
StatePublished - Jan 15 2015

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Keywords

  • Polymer electrolyte Dye sensitized solar cell Macroscopic modeling First principles Initiated chemical vapor deposition

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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