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Chin. Phys. B, 2018, Vol. 27(8): 088801    DOI: 10.1088/1674-1056/27/8/088801
INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY Prev   Next  

Electronic states and molecular orientation of ITIC film

Ying-Ying Du(杜莹莹)1, De-Qu Lin(林德渠)1, Guang-Hua Chen(陈光华)1, Xin-Yuan Bai(白新源)1, Long-Xi Wang(汪隆喜)1, Rui Wu(吴蕊)2, Jia-Ou Wang(王嘉鸥)2, Hai-Jie Qian(钱海杰)2, Hong-Nian Li(李宏年)1
1 Department of Physics, Zhejiang University, Hangzhou 310027, China;
2 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
Abstract  ITIC is the milestone of non-fullerene small molecule acceptors used in organic solar cells. We study the electronic states and molecular orientation of ITIC film using photoelectron spectroscopy and x-ray absorption spectroscopy. The negative integer charge transfer energy level is determined to be 4.00±0.05 eV below the vacuum level, and the ionization potential is 5.75±0.10 eV. The molecules predominantly have the face-on orientation on inert substrates as long as the surfaces of the substrates are not too rough. These results provide the physical understanding of the high performance of ITIC-based solar cells, which also afford implications to design more advanced photovoltaic small molecules.
Keywords:  electronic states      molecular orientation      photovoltaic small molecule      photoelectron spectroscopy      XAS  
Received:  18 April 2018      Revised:  07 May 2018      Published:  05 August 2018
PACS:  88.40.jr (Organic photovoltaics)  
  73.30.+y (Surface double layers, Schottky barriers, and work functions)  
  61.46.-w (Structure of nanoscale materials)  
  61.05.cj (X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11374258 and 11079028).
Corresponding Authors:  Hong-Nian Li     E-mail:  phylihn@mail.zju.edu.cn

Cite this article: 

Ying-Ying Du(杜莹莹), De-Qu Lin(林德渠), Guang-Hua Chen(陈光华), Xin-Yuan Bai(白新源), Long-Xi Wang(汪隆喜), Rui Wu(吴蕊), Jia-Ou Wang(王嘉鸥), Hai-Jie Qian(钱海杰), Hong-Nian Li(李宏年) Electronic states and molecular orientation of ITIC film 2018 Chin. Phys. B 27 088801

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