Presenter：Zhuoying Chen (ESPCI Paris/CNRS/Sorbonne Université)
Topic：Nanocomposites and Nanoscale Structural-Properties for More Stable Perovskite Solar Cells
Time：2:00 PM, July 16th （Wednesday)
Location：910-308
Abstract:：
The achievement of both efficiency and stability in perovskite solar cells (PSCs) remains a challenging and actively researched topic. Under this context, our research team at LPEM strives to understand the degradation mechanisms and propose engineering methods to mitigate such effects. In this presentation, I will present recent works from our research team, applying nanoscale structural-property investigations, to reveal the underlying physical and chemical processes involved in the passivation and degradation of functional PSCs.
On the aspect of engineering methods to fight against PSCs' instability, fluorinated molecules have shown good promise in the literature by enabling moisture barriers to some extent. Most of previous reported fluorinated molecules involve relatively short-chain molecules, enabling only a limited impact on the water-contact-angle of the perovskite surface. Here, our group investigated a series of fluorosilane molecules with different chain lengths and their effect perovskite surfaces to achieve superhydrophobic surfaces. In particular, by coupling a series of spectroscopic techniques, I will discuss the underlying structural-property relationship of how these fluorosilane molecules interact with perovskite absorber.
On the degradation mechanisms of PSCs, I will present our recent work applying novel local electro- optical scanning technique to monitor the in-situ evolutions in terms of device interfacial temperature, photoluminescence (PL), and photovoltaic characteristics during device accelerated degradation.
Biography：
Dr. Z. Chen (HDR, Habilitation à diriger des recherches) has a multi-disciplinary scientific background and she is currently focusing on various research projects on the application of colloidal and hybrid organic-inorganic nanomaterials. During her PhD thesis at Columbia University (New York), she was trained as a material scientist focusing on colloidal synthesis and meta-material formation. She moved to the field of organic electronics for post-doctoral training and she studied charge transport and device physics in the Cavendish Laboratory of University of Cambridge (Prof. Henning Sirringhaus). Since October 2010 Chen was recruited by the CNRS (National Scientific Research Center, France) as a tenured research scientist. Since then she has been working on the optoelectronic applications of solution-processed colloidal nanocrystals and hybrid organic-inorganic systems.
Contact：Prof. Sun Baoquan