Phosphonic anchoring groups in organic dyes for solid-state solar cells

Antonio Abate, Raquel Pérez-Tejada, Konrad Wojciechowski, Jamie Foster, Aditya Sadhanala, Ullrich Steiner, Henry J. Snaith, Santiago Franco, Jesús Ordunac

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Abstract

We report the synthesis and the optoelectronic characterization of three new 4H-pyran-4-ylidene and thiazole derivatives (pyt) as metal-free organic dyes for solid-state dye-sensitized solar cells (DSSCs). We investigate the performance and the long-term stability of devices employing pyt dyes functionalized with carboxylic and phosphonic acids as TiO2 anchoring groups. In contrast to reports on liquid electrolyte DSSCs, we show that solid-state DSSCs prepared with phosphoric pyt derivatives can achieve similar power conversion efficiency to their carboxyl analogues. We make use of the Mott–Schottky analysis and equivalent circuit models to demonstrate that a phosphonic group induces a significant increase in built-in voltage at the TiO2-hole transporter interface, which results in a higher open circuit voltage.
Original languageEnglish
Pages (from-to)18780-18789
JournalPhysical Chemistry Chemical Physics
Volume17
Early online date8 Jun 2015
DOIs
Publication statusPublished - Jun 2015

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