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Inverted Organic Solar Cells with Improved Performance using Varied Cathode Bu?er Layers
Zhi-qiang Guan,Jun-sheng Yu*,Yue Zang,Xing-xin Zeng
Author NameAffiliationE-mail
Zhi-qiang Guan 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 
Yue Zang 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  
Xing-xin Zeng 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:
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.
Key words:  Organic solar cell, Inverted structure, Subphthalocyanine/C60, Cathode buffer layer, Space charge-limited current theory
FundProject:
使用不同阴极缓冲层提升性能的反型有机太阳能电池
官志强,于军胜*,臧月,曾星鑫
摘要:
使用含Alq3、Bphen、BCP、HATNA和Cs2CO3作为阴极缓冲层,制备了基于SubPc和C60的反型平面异质结有机太阳能电池. 比较了有机阴极缓冲层的最低未占有分子轨道和电子迁移率对有机太阳能电池性能的影响. 结果显示,Alq3、Bphen和HATNA能够大幅度提升器件的性能. 使用退火过后的HATNA作为阴极缓冲层获得了最高的效率,比没有阴极缓冲层的器件提升了7倍. 另外,使用空间电荷限制电流理论进行仿真的结果表明,通过加入HATNA作阴极缓冲层,反型有机太阳能电池结构中处于有机/电极界面处的肖特基势垒降低了27%.
关键词:  有机太阳能电池,反型结构,阴极缓冲层,SubPc/C60,空间电荷限制电流理论
DOI:10.1088/1674-0068/25/05/625-630
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