Highly efficient tandem photoelectrochemical solar cells using coumarin6 dye-sensitized CuCrO^sub 2^ delafossite oxide as photocathode

In this study, we introduce a new concept for the highly efficient tandem p-n photoelectrochemical cell consisting of coumarin6 organic dye-anchored p-type CuCrO2 delafossite semiconductor as photocathodes coupling with traditional n-type TiO2 based photoanodes. Also, we have systematically studied...

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Bibliographic Details
Published inSolar energy Vol. 169; p. 196
Main Authors Kaya, Ismail Cihan, Akin, Seckin, Akyildiz, Hasan, Sonmezoglu, Savas
Format Journal Article
LanguageEnglish
Published New York Pergamon Press Inc 15.07.2018
Subjects
Annealing
Chemical compounds
CRTs
Dyes
Iodides
P-type semiconductors
Photocathodes
Photoelectrochemical devices
Photovoltaic cells
Photovoltaics
Semiconductors
Solar cells
Solar energy
Surface area
Titanium dioxide
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Summary:In this study, we introduce a new concept for the highly efficient tandem p-n photoelectrochemical cell consisting of coumarin6 organic dye-anchored p-type CuCrO2 delafossite semiconductor as photocathodes coupling with traditional n-type TiO2 based photoanodes. Also, we have systematically studied the photovoltaic performance of tandem cells as a function of post-annealing of CuCrO2 films before sensitization. Hydrothermally synthesized CuCrO2 nanocrystals exhibited a high surface area with small crystallite size of 12 nm, phase-pure and well-crystalline after the optimized post-annealing conditions. The experimental results indicated that the optimal post-annealing temperature was 450 °C for 1 h due to the larger active surface area, lower Rct, and higher Jsc and Voc values. This tandem cell, fabricated by employing the CuCrO2 photocathodes, iodide-based redox mediator and a coumarin6 organic dye, afforded an impressive efficiency of 2.33% with Voc of 813 mV, Jsc of 4.83 mA cm−2, and fill factor of 0.59. The obtained parameters are acceptably high in comparison to NiO photocathode-based tandem cells previously reported in literature under similar experimental conditions. Therefore, this work opened the way for developing highly-efficient tandem photoelectrochemical solar cells.
ISSN:0038-092X
1471-1257