Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.279
Publication date: 18th July 2023
The pursuit of efficient, earth-abundant and stable photocatalysts has been the holy grail since TiO2 was discovered as a water-splitting photocatalyst more than 50 years ago.[1,2] Ever since, wide bandgap absorbers such as TiO2, SrTiO3 or Ga2O3 have dominated the field of particulate photocatalyst development predominantly due to their deep valence bands driving water oxidation and remarkable stability.[3] However, with less than 5% UV light in our solar spectrum, the overall solar energy conversion efficiency of such wide-bandgap systems is by default limited to efficiencies below 1%. Even with the most outstanding Al:SrTiO3 photocatalyst achieving one of the highest quantum yields reported, the overall solar-to-hydrogen conversion efficiency was only 0.65%.[4]
Tremendous efforts have been undertaken to extend the absorption into the visible to maximise the light-harvesting efficiency. On this quest, countless oxide and nitride as well as some oxynitride and oxysulfide materials with smaller bandgaps have been intensively studied with varying success.[3,5] In the novel visible light absorber (La,Sr)(Rh,Ti)O3 employed in the Z-scheme photocatalyst sheet device from Profs. Wang and Domen, the controlled A and B site substitutions led to a record 1% solar-to-hydrogen efficiency.[6]
Substitution on A and B-sites of the perovskite ABX3 crystal structure creates interesting defect chemistry widely studied in photo- and electrocatalysis. However, as our recent work on the La,Rh-co-doped SrTiO3 showed, attention to the formation of undesired trap states is particularly important when attempting to induce visible light absorption into wide-bandgap semiconducting photocatalysts.[7]
In this talk, I will dive into defect engineering and chemistry of a small series of oxide perovskites that we employ in photo- and electrocatalysis and discuss challenges and ambiguities in such defect engineering approaches as well as considerations when operating under reducing conditions.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
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.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.