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Organic Photovoltaic Cells with Improved Performance Using Bathophenanthroline as a Buffer Layer
Na-na Wang,Jun-sheng Yu*,Hui Lin,Ya-dong Jiang
Author NameAffiliationE-mail
Na-na Wang State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Infor-mation, University of Electronic Science and Technology of China, Chengdu 610054, China  
Jun-sheng Yu* State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Infor-mation, University of Electronic Science and Technology of China, Chengdu 610054, China jsyu@uestc.edu.cn 
Hui Lin State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Infor-mation, University of Electronic Science and Technology of China, Chengdu 610054, China  
Ya-dong Jiang State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Infor-mation, University of Electronic Science and Technology of China, Chengdu 610054, China  
Abstract:
The role of bathophenanthroline (Bphen) as a buffer layer inserted between fullerene (C60) and Ag cathode in organic photovoltaic (OPV) cell was discussed. By introducing Bphen as a buffer layer with thicknes from 0 to 2.5 nm, the power conversion efficiency of the OPV cell based on copper phthalocyanine (CuPc) and C60 was increased from 0.87% to 2.25% under AM 1.5 solar illumination at an intensity of 100 mW/cm2, which was higher than that of bathocuproine used as a buffer layer. The photocurrent-voltage characteristics showed that Bphen effectively improves electron transport through C60 layer into Ag electrode and leads to balance charge carrier transport capability. The influence of Bphen thickness on OPV cells was also investigated. Furthermore, the absorption spectrum shows that an additional Bphen layer enhances the light harvest capability of CuPc/C60.
Key words:  Organic photovoltaic cell, Buffer layer, Bathophenanthroline, Charge carrier transport
FundProject:
Organic Photovoltaic Cells with Improved Performance Using Bathophenanthroline as a Buffer Layer
王娜娜,于军胜*,林慧,蒋亚东
摘要:
采用Bphen作为缓冲层,研究Bphen处在电子受体材料C60和阴极Ag之间对有机薄膜光伏电池(OPV)性能的影响.通过引入2.5nm厚的Bphen,在100 mW/cm2光照下,CuPc/C60结构的器件效率从0.87%提高到2.25%. 对光生电流-电压的分析表明,Bphen缓冲层可以有效的提高电子从C60层向Ag阴极的传输能力和平衡器件中载流子的传输能力.系统研究了Bphen厚度对OPV器件性能的影响,发现随着Bphen厚度的增加,电导率的降低是限制器件性能的主要原因.此外,采用紫外-可见光分光光度计测试了器件的吸收光谱,发现Bphen缓冲层可以增强CuPc/C60的光吸收能力.
关键词:  有机光伏电池,缓冲层,Bphen,载流子传输
DOI:10.1088/1674-0068/23/01/84-88
分类号: