Self-doped n-type small molecular electron transport materials for high-performance organic solar cells

被引：51
作者：
Liu, Jinju [1 ]
Zheng, Nannan [1 ]
Hu, Zhicheng [1 ]
Wang, Zhenfeng [1 ]
Yang, Xiye [1 ]
Huang, Fei [1 ]
Cao, Yong [1 ]
机构：
[1] South China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China
来源：
SCIENCE CHINA-CHEMISTRY | 2017年 / 60卷 / 08期
基金：
中国国家自然科学基金;
关键词：
self-doped n-type small molecules; organic solar cells; electron transport layers; SOLUBLE CONJUGATED POLYMERS; CATHODE INTERLAYER; PERYLENE DIIMIDE; INTERCONNECTING LAYER; 11-PERCENT EFFICIENCY; PHOTOVOLTAIC CELLS; DESIGN; DONOR; MORPHOLOGY; ACCEPTOR;
D O I：
10.1007/s11426-017-9057-1
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Two naphthalene diimide (NDI) and perylene diimide (PDI) based n-type water/alcohol soluble small molecules (NFN and PFP) are designed and utilized as electron transport layers (ETLs) for organic solar cells (OSCs). NFN and PFP are synthesized by using Sonogashira coupling from alkynyl modified fluorene with mono-bromo substituted NDI and PDI. Density functional theory study results of NFN and PFP show that they possess excellent planarity due to the employment of triple bonds as connection units. Moreover, it was shown by electron paramagnetic resonance study that both NFN and PFP possess obvious self-doping behaviors, which may effectively enhance their charge transporting capability as ETLs in OSCs. Power conversion efficiencies of 8.59% and 9.80% can be achieved for OSCs with NFN and PFP as ETLs, respectively. The higher power conversion efficiency (PCE) of PFP based photovoltaic device is originated from the stronger doping property and higher mobility of PFP.
引用
收藏
页码：1136 / 1144
页数：9
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