反型有机太阳能电池中聚乙烯亚胺/氧化锌电子缓冲层的制备及性能

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吕思刘a，  王莉b(青岛科技大学 a.橡塑材料与工程教育部重点实验室；b.材料科学与工程学院，山东 青岛 266042)

 摘要： 通过简易的溶液旋涂法制备了聚乙烯亚胺(PEI)/氧化锌(ZnO)薄膜并应用到反型有机太阳能电池中。实验证明，基于PEI/ZnO电子缓冲层的有机太阳能电池的光电转换效率远高于单一PEI或ZnO作为电子缓冲层的器件效率。其原因是PEI/ZnO的构建，一方面使界面能级匹配性提高，有利于电子的定向传输，减小了电子从ZnO到ITO的传输电阻；另一方面减小了界面对光的反射，从而起到对可见光的增透作用。研究进一步明确了界面理论对有机太阳能电池的重要性，为开发更高效率的电子缓冲层材料提供了深入的理论和实验基础。

关键词： 聚乙烯亚胺； 氧化锌； 电子缓冲层； 太阳能电池

中图分类号： O 063                   文献标志码： A

 PEI/ZnO Electron Selective Layer for Inverted Organic Solar Cells

L Siliua, WANG Lib

(a.Key Laboratory of RubberPlastics, Ministry of Education;

 b.College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)

Abstract: A thin PEI layer was introduced between the ITO and the ZnO layer to reduce the resistance when electrons transferred from ZnO nanoparticles layer to the ITO transparent electrode. Solution processed PEI/ZnO film was developed as a high efficient cathode buffer layer for inverted organic solar cells. The efficiency of the P3HT:PCBM solar cell fabricated with PEI/ZnO film as the electron buffer layer exhibits much higher efficiency than the device only with PEI or ZnO nanoparticles cathode buffer layer. The improvement of the efficiency is attributed to the decrease of the interfacial barriers between the ITO electrode and the ZnO nanoparticles. The finding in this paper opens a new pathway to design high efficient buffer layers.

Key words: polyetherimide; znic oxide; buffer layer; solar cell

收稿日期： 20140425

作者简介： 吕思刘（1986—），男，硕士研究生.         *通信联系人.

文章编号：16726987（2015）04038606； DOI： 10.16351/j.16726987.2015.04.007