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Chin. Phys. B, 2018, Vol. 27(7): 078802    DOI: 10.1088/1674-1056/27/7/078802

Self-assembled monolayer modified copper(I) iodide hole transport layer for efficient polymer solar cells

Yuancong Zhong(钟远聪)1,2, Qilun Zhang(张琪伦)1, You Wei(魏优)1, Qi Li(李琦)1, Yong Zhang(章勇)1
1 Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, Institute of Optoelectronic Material and Technology, South China Normal University, Guangzhou 510631, China;
2 School of Physics and Optical Information Technology, Jiaying University, Meizhou 514015, China
Abstract  The morphology of the copper iodide (CuI) film as an inorganic p-type material has an important influence on enhancing the performance of polymer solar cells (PSCs). A self-assembled monolayer of 3-aminopropanoic acid (C3-SAM) was used on the surface of indium tin oxide (ITO) before depositing the CuI films. Consequently, a well-distributed and smooth CuI film was formed with pinhole free and complete surface coverage. The root mean square of the corresponding CuI film was reduced from 3.63 nm for ITO/CuI to 0.77 nm. As a result, the average power conversion efficiency (PCE) of PSCs with the device structure of ITO/C3-SAM/CuI/P3HT:PC61BM/ZnO/Al increased significantly from 2.55% (best 2.66%) to 3.04% (best 3.20%) after C3-SAM treatment. This work provides an effective strategy to control the morphology of CuI films through interfacial modification and promotes its application in efficient PSCs.
Keywords:  polymer solar cell      copper(I) iodide      self-assembled monolayer      morphology  
Received:  07 March 2018      Revised:  01 May 2018      Published:  05 July 2018
PACS:  88.40.jr (Organic photovoltaics)  
  72.80.Jc (Other crystalline inorganic semiconductors)  
  81.16.Dn (Self-assembly)  
  68.55.-a (Thin film structure and morphology)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61377065 and 61574064), the Science and Technology Planning Project of Guangdong Province, China (Grant Nos. 2013CB040402009 and 2015B010132009), and the Science and Technology Project of Guangzhou City, China (Grant No. 2014J4100056).
Corresponding Authors:  Yong Zhang     E-mail:

Cite this article: 

Yuancong Zhong(钟远聪), Qilun Zhang(张琪伦), You Wei(魏优), Qi Li(李琦), Yong Zhang(章勇) Self-assembled monolayer modified copper(I) iodide hole transport layer for efficient polymer solar cells 2018 Chin. Phys. B 27 078802

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