Electronic states and molecular orientation of ITIC film

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

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
Accepted manuscript online:

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

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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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