应“千人计划”学者Lionel Vayssieres教授邀请，墨西哥Center of Research and Advanced Studies (Cinvestav)的Gerko Oskam教授将于2月1日（周四）上午10：00-11:00，在能动学院北二楼11楼会议室举办学术讲座，请实验室师生积极参加学习交流。
Title:Nanomaterials for Solar Energy Conversion Systems
Abstract: In this presentation, an overview will be given of the research in our group in the Department of Applied Physics at CINVESTAV-Mérida (Yucatán, México) on the application of nanomaterials in a variety of solar energy systems, including photovoltaics, solar fuels, and solar-to-thermal energy conversion.
In photovoltaics, the main efforts in our group have been on the dye-sensitized solar cell (DSC), with a particular focus on the charge transport and recombination processes and kinetics, applying small-signal modulation techniques such as electrochemical impedance spectroscopy (EIS), and intensity-modulated photocurrent and photovoltage spectroscopy (IMPS and IMVS). We also are making progress in the scale-up of the technology fabricating mini-modules of 24 cm2, reaching an efficiency of 4.8% for the DSCs based on anatase (in active area). We have recently started working on the hybrid perovskite solar cell, with particular focus on the physicochemical properties of hybrid perovskite materials both in the solar cell and in templates of different materials.
In the solar fuels research project, we use a combinatorial technique to look for new metal oxide nanomaterials for solar water splitting. In addition, we use advanced (photo)electrochemical methods in order to study the fundamental processes taking place in promising nanomaterials. Recent work has shown interesting results for the p-type semiconductor CuBi2O4, and we have analyzed the hole transport and recombination properties using IMPS and EIS. In addition, we are investigating water oxidation on WO3 electrodes, using the same techniques for electron transport measurements.
In the solar-to-thermal energy conversion project, we focus on selective coatings that efficiently absorb sunlight but with a low thermal emittance, thus optimizing the conversion efficiency and minimizing loss processes. We use both electrodeposition and sputtering to prepare selective coatings, using cermet and multilayer stack approaches in order to tailor the optical properties of the thin films. Specific examples for Ni and Co black, and Al2O3-MoOx-Al2O3 systems will be presented.
Department of Applied Physics, CINVESTAV-IPN, Antigua Carretera a Progreso km 6, Mérida, Yucatán 97310, México.