Optimizing CuO p-type dye-sensitized solar cells by using a comprehensive electrochemical impedance spectroscopic study

Oliver Langmar, Carolina R. Ganivet, Gema De La Torre, Tomás Torres, Rubén D. Costa, Dirk M. Guldi

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

We introduce a novel and comprehensive approach for the evaluation and interpretation of electrochemical impedance spectroscopy (EIS) measurements in p-type DSSCs. In detail, we correlate both the device performance and EIS figures-of-merit of a series of devices in which, the calcination temperature, film thickness, and electrolyte concentration have been systematically modified. This new approach enables the separation of the different processes across the dye/semiconductor/electrolyte interface, namely the unfavorable charge recombination and the favorable electron injection/regeneration processes. In addition, studies on non-sensitized CuO and NiO electrodes provide insights into their affinity towards a reaction with the electrolyte-CuO is far less reactive towards the polyiodide species. Overall, this work underlines the superior features of CuO with respect to NiO for p-DSSCs and demonstrates a comprehensive optimization of the CuO-based DSSCs with respect to the device architecture by the aid of EIS analysis.

Original languageEnglish
Pages (from-to)17963-17975
Number of pages13
JournalNanoscale
Volume8
Issue number41
DOIs
Publication statusPublished - 2016 Nov 7
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)

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