利用金奈米粒子之電漿效應提升有機太陽能元件之特性

Abstract

本研究主要在探討在緩衝層中掺雜金奈米粒子之後的有機光伏特元件特性。我們可以發現，在掺雜金奈米粒子後能使元件的短路電流、填充係數，及功率轉換效率有明顯的提升，而元件的開路電壓則不受影響。在掺雜金奈米粒子後能使元件的激子產生率提升，同時激子也能有效的被分離成電子與電洞，因而使短路電流及填充係數提升有了明顯提升。由於局部表面電漿共振會使局部電場提升，因此我們推論，激子產生率及激子分離率的提升是來自於局部表面電漿共振的關係。在掺雜金奈米粒子後能使元件的功率轉換效率從3.48%提升到4.19%。

In this study, we after investigated the device characteristics of organic photovoltaics (OPVs) incorporating Au nanoparticles (NPs) in the buffer layers. We found that the addition of Au NPs improved the device performances obviously. The short-circuit current (Jsc), the fill factor (FF), and the power conversion efficiency (PCE) were improved while the open-circuit voltage (Voc) remained unchanged. The addition of Au NPs increased the rate of exciton generation and the probability of exciton dissociation, thereby enhancing the short-circuit current and the fill factor. We attribute the improvement in device performance to the local enhancement of the electromagnetic field originating from the excitation of the localized surface plasmon resonance (LSPR). The incorporating of plasmonic Au NPs in the buffer layer resulted in an increase in power conversion efficiency from 3.48% to 4.19%. We have demonstrated that the improvement is due to the presence of the resulting LSPR, not to the change of the conductivity of the buffer layers.