有機-無機混成電子傳導層應用於有機光伏元件之研究

Abstract

本研究利用添加聚乙烯亞胺(Polyethylenimine, PEI)於溶凝膠法氧化鋅中，形成有機-無機混成之電子傳導層，藉由聚乙烯亞胺的添加可改善氧化鋅粒子的奈米團簇現象、修飾主動層與電子傳導層界面與調控能階。實驗上使用小角度 X 光散射(SAXS)等技術分析微結構，結果顯示添加聚乙烯亞胺可有效的改善氧化鋅的奈米團簇且降低表面粗糙度，可增進電子傳導性質並修飾與主動層的物理接觸。能階分析則利用紫外光光電子能譜(UPS)量測，可發現添加聚乙烯亞胺後能階有明顯上升，可與主動層之界面較為趨向歐米接觸。當添加 7%聚乙烯亞胺於氧化鋅中做為電子傳導層時，P3HT:PC61BM 元件可達到最高光電轉換效率 4.6% ，且在短路電流與填充因子部份有顯著的提升。

In this research we present an “Organic-Inorganic Hybrid Electron Transport Layer” to control microstructure and tune energy level of zinc oxide. In the experimental part, we blend polyethylenimine with sol-gel processed zinc oxide and control the concentration of polyethylenimine to modify property of zinc oxide. The small angle X-ray scattering (SAXS) measurements demonstrate decrease of zinc oxide nanoclusters size for better quality of thin film. The ultraviolet photoelectron spectroscopy (UPS) measurements show shift of energy level for better electron-transporting. Using this approach, P3HT:PC61BM solar cell parameters including short circuit current density and fill factor are improved leading to the PCE increase up to 4.6%.