报告题目：Design of perovskites and selective contacts for Solar Cells
报告人：Pr. Thierry Pauporté
Pr. Thierry Pauporté- is director of research at the Centre National de la Recherche Scientifique (CNRS) in France and he works at Chimie-Paristech (. He is graduated in Chemistry from the École Normale Supérieure de Lyon. He received his Ph.D. in physical chemistry from the Montpellier II University, France, in 1995. Dr. Th. Pauporté has made original and innovative contributions to the synthesis, characterization and understanding of fundamental chemical and physical properties of oxide films and nanostructures. He also works on hybrid perovskite semiconductors. His research interests include the functionalizing of the material surfaces and he works on the integration of films and structures in efficient devices. The related applications are the light emitting diodes, perovskite solar cells, dye-sensitized solar cells, nanosensors, photodetectors, photocatalysis, wettability, fouling…. He has published more than 175 papers in peer-reviewed journals, 5 book
In recent years, new concepts, materials and technologies have dramatically boosted the efficiency of solar cells prepared from solutions. Among them, perovskite solar cells appeared the most recently and are the most promising. However, beside the pure high performances of these devices, many bottlenecks remain, the main ones being their cost, their stability, the toxicity of lead halide perovskites and the understanding of their electrical response.
During this seminar, a panorama of the recent research carried out at Chimie-Paristech on these various aspects will be presented. Our researches show the high possibilities, high control and versatility of the solution growth techniques for the preparation of materials with desired properties. We will illustrate the great importance of the interfaces and selective contact properties for reaching high efficiencies perovskite solar cells. We will develop our recent results and achievement on the preparation of oxide structures, of highly efficient pure phase perovskites, on the effect of doping the hole transporting material (HTM) and on the development of new HTMs. In every case, impedance spectroscopy studies have provided us important inputs for understanding the device performances and their variations. Impedance spectroscopy is also a powerful tool to discriminate the bulk and interface effects. Finally, we will discuss the new lead-deficient perovskite family and lead-free perovskite.