Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Publication date: 6th February 2020
Ultrasonic spray deposition is a promising and versatile wet coating method for both fundamental and industrial R&D. Homogeneous thin films can be obtained on large area substrates at atmospheric pressure, with a high degree of control on the resulting morphology and thickness by adjustment of the practical spray conditions (substrate temperature, nozzle-to-substrate distance, deposition pattern, solution flow rate, carrier gas nature and pressure…). In comparison with other atomization modes, ultrasonic nozzles further allow for improved quality of drop size distribution together with reduced quantities of material consumption and overspray.
In recent works, we have shown the benefits brought by ultrasonic spray coating for the deposition of various light-driven optoelectronic materials such tin-doped indium oxide ITO plasmonic nanocrystals in electrochromic smart windows or mesostructured hematite photoanodes in photoelectrochemical water splitting devices. We have also considered the spray-processing of semiconducting TiO2 layers as components of dye-sensitized and perovskite solar cells. Particularly, thin compact films of TiO2 have been deposited onto FTO-covered glass to act as blocking layers preventing electron recombination at the interface between the substrate and the hole-transporting material.
Coatings properties – morphology, thickness, crystallinity, electrochemical blocking behaviour… – and resulting power conversion efficiencies in fully-assembled solar cells have shown to be highly dependent on specific deposition parameters such as solvent and precursors nature and concentration, temperature, carrier gas or patterning conditions. Corresponding results will be presented and discussed, including SEM and XRD measurements, cyclic voltammetry and EIS analyses as well as I-V curves.
The research is supported by the ARC grant for Concerted Research Actions, financed by the French Community of Belgium, and through the SOLIDYE_1 Project, Complement FEDER (Grant agreement 1510607), financed by the Walloon Region .
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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