INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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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 |
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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.
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Received: 18 April 2018
Revised: 07 May 2018
Accepted manuscript online:
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PACS:
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88.40.jr
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(Organic photovoltaics)
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73.30.+y
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(Surface double layers, Schottky barriers, and work functions)
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61.46.-w
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(Structure of nanoscale materials)
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61.05.cj
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(X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.)
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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
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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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