Ultrasonic spray deposition of TiO2 and other semiconducting layers for solar cells and light-driven optoelectronic devices
Anthony Maho a, Jennifer Dewalque a, Gilles Spronck a, Audrey Schrijnemakers a, Nathan Daem a, Pierre Colson a, Catherine Henrist a, Rudi Cloots a
a CESAM-GREENMAT, University of Liege, Allée du 6 Aout 13, Sart-Tilman, 4000 Liege, Belgium.
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Poster, Anthony Maho, 203
Publication date: 11th February 2019

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 .

© Fundació Scito
We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info