Inverted Organic Solar Cells with Improved Performance using Varied Cathode Buffer Layers

作     者：Zhi-qiang Guan Jun-sheng Yu Yue Zang Xing-xin Zeng 

作者机构：State Key Laboratory of Electronic Thin Films and Integrated DevicesSchool of Optoelectronic Infor-mationUniversity of Electronic Science and Technology of ChinaChengdu 510054China 

出 版 物：《Chinese Journal of Chemical Physics》 (化学物理学报（英文）)

年 卷 期：2012年第25卷第5期

页      面：625-630,I0004页

核心收录：

学科分类：080903[工学-微电子学与固体电子学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the National Natu- ral Science Foundation of China Foundation for Innovative Research Groups of the Na- tional Natural Science Foundation Fundamental Research Funds for the Central Uni- versities 国家教育部留学回国人员科研启动基金 国家教育部高等学校博士学科点专项科研基金 

主　　题：Organic solar cell Inverted structure Subphthalocyanine/C60 Cathode bufferlayer Space charge-limited current theory 

摘      要：Organic solar cells with inverted planar heterojunction structure based on subphthalocya- nine and C60 were fabricated using several kinds of materials as cathode buffer layer （CBL）, including tris-8-hydroxy-quinolinato aluminum （Alq3）, bathophenanthroline （Bphen）, bathocuproine, 2,3,8,9,14,15-hexakis-dodecyl-sulfanyl-5,6,11,12,17,18-hexaazatrinaphthylene （HATNA）, and an inorganic compound of Cs2CO3. The influence of the lowest unoccupied molecular orbital level and the electron mobility of organic CBL on the solar cells perfor- mance was compared. The results showed that Alq3, Bphen, and HATNA could significantly improve the device performance. The highest efficiency was obtained from device with an- nealed HATNA as CBL and increased for more than 7 times compared with device without CBL. Furthermore~ the simulation results with space charge-limited current theory indicated that the Schottky barrier at the organic/electrode interface in inverted OSC structure was reduced for 27% by inserting HATNA CBL.