利用表面電漿共振效應提升反式結構之有機太陽能電池之特性

Abstract

本研究中我們在反式結構有機太能陽電池的Cs2CO3中層加入金奈米粒子引發局部表面電漿共振，以提升元件的能量轉換效率。我們發現元件在摻雜奈米粒子後，元件的開路電壓並未改變，而短路電流、填充因子、能量轉換效率則有明顯的提升，元件最終效率由3.12%提升至3.54%。此外，經由量測並計算所得的激子產生率和分離機率可以證實表面電漿效應不單只能增加元件對光的吸收，也可有效抑制主動層中電子電洞對的再結合；我們推論元件的短路電流和填充因子因此而提升。

In this study, we incorporated gold nanoparticles (Au NPs) in the Cs2CO3 buffer layer. Au NPs induced the effect of localized surface plasmon resonance (LSPR) in organic solar cells and improved the device performances. We found the short-circuit current density (Jsc), fill factor and power conversion efficiency (PCE) were obviously improved, while the open voltage( Voc) remained unchanged after doped the Au NPs. As a result, the PCE of the device incorporating Au NPs improved to 3.54% from the value of 3.12% for the device fabricated without Au NPs. Furthermore, we calculated the rate of exciton generation and the probability of exciton dissociation; they were both enhanced after doping Au NPs. It was proved that LSPR could not only enhance light absorption but reduce the recombination of electron-hole pairs in the active layer thus increasing the photocurrents and fill factors.