报告人：陈景润，苏州大学，教授

题 目：Estimation of exciton diffusion lengths of organic semiconductors in random domains

时 间：2019年6月5日（星期三）下午13:30 - 14:30

报告地点：2-S256

摘 要：Exciton diffusion length plays a vital role in the function of opto-electronic devices. Oftentimes, the domain occupied by a organic semiconductor is subject to surface measurement error. In many experiments, photoluminescence over the domain is measured and used as the observation data to estimate this length parameter in an inverse manner based on the least square method. However, the result is sometimes found to be sensitive to the surface geometry of the domain. We propose an asymptotic-based method as an approximate forward solver whose accuracy is justified both theoretically and numerically. It only requires to solve several deterministic problems over a fixed domain. Therefore, for the same accuracy requirement we tested here, the running time of our approach is more than one order of magnitude smaller than that of directly solving the original stochastic boundary-value problem by the stochastic

collocation method. In addition, from numerical results we find that the correlation length of randomness is important to determine whether a 1D reduced model is a good surrogate. This is joint work with Ling Lin (Sun Yat-sen University), Zhiwen Zhang (University of Hong Kong), and Xiang Zhou (City University of Hong Kong).

报告人简介:陈景润苏州大学教授。主要研究兴趣为材料性质的多尺度建模、分析与计算，工作发表在Journal of Computational Physics，Mathematics of Computation，以及Multiscale Modeling & Simulations等杂志上。2005年在南京大学获得本科学位，2010年在中国科学院数学与系统科学研究院获得博士学位，之后在美国加州大学圣芭芭拉分校做博士后，2015年入职苏州大学。2016年入选中组部“国家级人才”青年项目，主持美国自然科学基金一项，中国自然科学基金一项。