CuPc/C60 bulk heterojunction photovoltaic cells with evidence of phase segregation

被引:28
|
作者
Li, Xin [1 ,2 ]
Chen, Yan [1 ,2 ]
Sang, Jie [1 ,2 ,3 ,4 ]
Mi, Bao-Xiu [1 ,2 ,3 ,4 ]
Mu, Dan-Hua [1 ,2 ]
Li, Zhi-Gang [1 ,2 ,3 ,4 ]
Zhang, Hui [1 ,2 ,3 ,4 ]
Gao, Zhi-Qiang [1 ,2 ]
Huang, Wei [3 ,4 ]
机构
[1] Nanjing Univ Posts & Telecommun, Jiangsu Engn Ctr Flat Panel Displays & Solid Stat, Nanjing 210046, Jiangsu, Peoples R China
[2] Nanjing Univ Posts & Telecommun, Coll Mat Sci & Engn, Nanjing 210046, Jiangsu, Peoples R China
[3] Nanjing Univ Posts & Telecommun, KLOEID, Nanjing 210046, Peoples R China
[4] Nanjing Univ Posts & Telecommun, IAM, Nanjing 210046, Peoples R China
基金
中国国家自然科学基金;
关键词
Organic photovoltaic; Small molecule; Bulk heterojunction; Phase segregation; CuPc/C60; POLYMER SOLAR-CELLS; EFFICIENCY;
D O I
10.1016/j.orgel.2012.10.041
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This work presents organic photovoltaic (OPV) device study based on cupper phthalocyanine (CuPc) and fullerene (C60) bulk heterojunction (BHJ) structure. By varying blend composition, the optimized performances were obtained in 75%-CuPc containing devices with anode buffer of either CuPc or HPCzI (1,3,4,5,6,7-hexaphenyl-2-{3'-(9-ethylcarbazolyl)}isoindole). It was discovered by scanning electron microscopy that 75%-CuPc containing film possessed phase separation, which is beneficial to charge transport via percolation process. Additionally, electronic absorption measurement and hole only device study showed that, depending on the mixing ratio, the absorption and the hole transport ability were different. The blend film containing 75% CuPc had the largest integrated absorption with the most CuPc dimmer aggregate and the least C60 aggregate. Moreover, the 75% CuPc blend film also possessed the highest hole transport ability. Thus, the best performance of the 75% CuPc BHJ device is mainly attributed to its good carrier transport originating from phase segregation. The present work highlights the phase separation in CuPc:C60 mixing film with optimized ratio, as well as its corresponding electronic absorption and carrier transport properties, which are essential for OPV device performance. Hence, insights are inferred for further engineering of BHJ OPV devices based on small molecules. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:250 / 254
页数:5
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