Publication date: 15th December 2014
Two photoelectrode systems were individually optimized for the process of solar-driven overall water splitting in acidic electrolytes: 1) phase-pure Pt-doped anatase TiO2, prepared by Ion Layer Gas Reaction (ILGAR), was employed as an electrocatalytic protection layer on device-grade p-type Cu(In,Ga)Se2. It will be shown that the gradual increase of the Pt-concentration within the TiO2-layer passes through an efficiency- and stability-maximum of the electrode. At this maximum, Incident Photon-to-Current Efficiencies (IPCE) of 80% could be achieved over the full range of the solar spectrum (AM1.5). Photocurrent densities reached more than 12.5 mAcm-2 at the thermodynamic potential for H2-evolution in 0.5 M H2SO4[1]. Further improvements of the heterojunction, realized by atomic layer deposition (ALD), will be discussed. 2) Nanoparticulate RuO2 was deposited on n-type Si by electrophoretic deposition. During deposition, an ultra-thin SiO2 film was simultaneously formed that acts as protection layer. Oxygen evolution photocurrent densities of up to 18 mAcm-2 could be achieved at 1.23 V vs RHE in 0.5M H2SO4. Both photoelectrodes maintained photocurrent densities of 12 mAcm-2 for more than 25 hours, demonstrating the promising stability offered by these novel Pt-TiO2 and SiO2/RuO2 protection layers. The film and interface properties were investigated with photoelectron spectroscopy, electron microscopy and surface photovoltage measurements, offering new insights in the structure of electronic defects in the Pt-doped TiO2 layer and at the Si/RuO2 interface. Finally, device development in combination with a two-junction tandem solar cell will be discussed.
[1] A. Azarpira et al. Advanced Energy Materials (submitted 11/2014)
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.