CVD-graphene/graphene flakes dual-films as advanced DSSC counter electrodes
arXiv:1910.14625 · doi:10.1088/2053-1583/ab117e
Abstract
The use of graphene-based electrodes is burgeoning in a wide range of applications, including solar cells, light emitting diodes, touch screens, field-effect transistors, photodetectors, sensors and energy storage systems. The success of such electrodes strongly depends on the implementation of effective production and processing methods for graphene. In this work, we take advantage of two different graphene production methods to design an advanced, conductive oxide- and platinum-free, graphene-based counter electrode for dye-sensitized solar cells (DSSCs). In particular, we exploit the combination of a graphene film, produced by chemical vapor deposition (CVD) (CVD-graphene), with few-layer graphene (FLG) flakes, produced by liquid phase exfoliation. The CVD-graphene is used as charge collector, while the FLG flakes, deposited atop by spray coating, act as catalyst for the reduction of the electrolyte redox couple (i.e., I3-/I-- and Co+2/+3). The as-produced counter electrodes are tested in both I3-/I-- and Co+2/+3-based semitransparent DSSCs, showing power conversion efficiencies of 2.1% and 5.09%, respectively, under 1 SUN illumination. At 0.1 SUN, Co+2/+3-based DSSCs achieve a power conversion efficiency as high as 6.87%. Our results demonstrate that the electrical, optical, chemical and catalytic properties of graphene-based dual films, designed by combining CVD-graphene and FLG flakes, are effective alternatives to FTO/Pt counter electrodes for DSSCs for both outdoor and indoor applications.
References in corpus (26)
- Electric Field Effect in Atomically Thin Carbon Films
- The Raman Fingerprint of Graphene
- Large-Area Synthesis of High-Quality and Uniform Graphene Films on Copper Foils
- 30 inch Roll-Based Production of High-Quality Graphene Films for Flexible Transparent Electrodes
- Ultrahigh electron mobility in suspended graphene
- Graphene Photonics and Optoelectronics
- Raman spectroscopy as a versatile tool for studying the properties of graphene
- High yield production of graphene by liquid phase exfoliation of graphite
- Thermal Properties of Graphene, Carbon Nanotubes and Nanostructured Carbon Materials
- The structure of suspended graphene sheets
- Intrinsic and Extrinsic Performance Limits of Graphene Devices on SiO2
- Raman scattering from high frequency phonons in supported n-graphene layer films
- Excitonic Effects on the Optical Response of Graphene and Bilayer Graphene
- Anomalies in thickness measurements of graphene and few layer graphite crystals by tapping mode atomic force microscopy
- Water-based and Biocompatible 2D Crystal Inks: from Ink Formulation to All- Inkjet Printed Heterostructures
- A lithium-ion battery based on a graphene nanoflakes ink anode and a lithium iron phosphate cathode
- High Concentration Few-layer Graphene Sheets Obtained by Liquid Phase Exfoliation of Graphite in Ionic Liquid
- Technique for the Dry Transfer of Epitaxial Graphene onto Arbitrary Substrates
- High-yield production of 2D crystals by wet-jet milling
- On the Nature of Defects in Liquid-Phase Exfoliated Graphene
- Rapid CVD growth of millimetre-sized single crystal graphene using a cold-wall reactor
- WS2-graphite dual-ion battery
- Solution-processed hybrid graphene flake/2H-MoS2 quantum dot heterostructures for efficient electrochemical hydrogen evolution
- Graphene-Based Hole Selective Layers for High-Efficiency, Solution-Processed, Large-Area, Flexible, Hydrogen-Evolving Organic Photocathodes
- Thioethyl-porphyrazine/Nanocarbon Hybrids for Photoinduced Electron Transfer
- Engineered MoSe2-based heterostructures for efficient electrochemical hydrogen evolution reaction