Electronic states and molecular orientation of ITIC film

doi:10.1088/1674-1056/27/8/088801

中国物理B ›› 2018, Vol. 27 ›› Issue (8): 88801-088801.doi: 10.1088/1674-1056/27/8/088801

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

Electronic states and molecular orientation of ITIC film

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)

1 Department of Physics, Zhejiang University, Hangzhou 310027, China;
2 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

收稿日期:2018-04-18 修回日期:2018-05-07 出版日期:2018-08-05 发布日期:2018-08-05
通讯作者: Hong-Nian Li E-mail:phylihn@mail.zju.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11374258 and 11079028).

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

Received:2018-04-18 Revised:2018-05-07 Online:2018-08-05 Published:2018-08-05
Contact: Hong-Nian Li E-mail:phylihn@mail.zju.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 11374258 and 11079028).

摘要/Abstract

摘要： 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.

关键词: electronic states, molecular orientation, photovoltaic small molecule, photoelectron spectroscopy, XAS

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.

Key words: electronic states, molecular orientation, photovoltaic small molecule, photoelectron spectroscopy, XAS

中图分类号: (Organic photovoltaics)

88.40.jr

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.)

杜莹莹, 林德渠, 陈光华, 白新源, 汪隆喜, 吴蕊, 王嘉鸥, 钱海杰, 李宏年. Electronic states and molecular orientation of ITIC film[J]. 中国物理B, 2018, 27(8): 88801-088801.

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[J]. Chin. Phys. B, 2018, 27(8): 88801-088801.

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Electronic states and molecular orientation of ITIC film

Electronic states and molecular orientation of ITIC film

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