报告题目：Utilizing metal nanostructures for optical and electrical gains in organic optoelectronic devices

报 告 人：Assoc. Prof. Jung-Yong Lee

Korea Advanced Institute of Science and Technology (KAIST), Korea

报告时间：2015年11月24日下午2:50-3:40

报告地点：化学楼二楼一号会议室 

报告人简介：

Ph. D, Stanford University, USA

M. S. Seoul National University, Korea

B. S. Seoul National University, Korea

报告简介：

Here, we investigate the dependence of metal nanoparticles’ size and shape, at various concentrations, on the power conversion efficiency of organic solar cells (OSCs)[1]. Also, we propose a metal-metal core-shell nanocube (NC) as an advanced plasmonic material for highly efficient OSCs. We covered an Au core with a thin Ag shell as a scattering enhancer to build Au@Ag NCs, showing stronger scattering efficiency than pristine Au nanoparticles (AuNPs) throughout the visible range. Highly efficient plasmonic organic solar cells were fabricated by embedding Au@Ag NCs into an anodic buffer layer, poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS)[2, 3].

In the second part, we demonstrate that the metal nanoparticles can improve the performance of OSCs by boosting the internal quantum efficiency (IQE) of the devices even without a notable plasmonic optical gain.[4] A hybrid layer platform in combination of silver nanoparticles (AgNPs) and polyethylenimine-ethoxylated (PEIE) layer maximized the IQE of the OSCs to nearly 100 %. 2D surface characterization confirmed the AgNPs provided the short path and funneled charge carriers to a cathode, which would effectively raise the carrier mobility. Moreover, the hybrid layer doubled the device half-efficiency lifetime due to longer retention of the improved mobility.