Evolution of optical properties and molecular structure of PCBM films under proton irradiation

doi:10.1088/1674-1056/ac322b

Abstract Low-energy proton irradiation effects on the optical properties and the molecular structure of phenyl-C₆₁-butyric acid methyl ester (PCBM) are studied in this work. The PCBM films are irradiated by 100-keV proton beams with fluences of 5×10¹² p/cm², 5×10¹³ p/cm², and 5×10¹⁴ p/cm², respectively. The photoluminescence (PL) peaks of the post-irradiated PCBM films show a progressive decrease in the peak intensity as the proton fluences increase, which can be attributed to the deep defect levels induced by proton irradiation. Additionally, a slight blue-shift in the PL spectrum is also observed at a proton fluence of 5×10¹⁴ p/cm². The underlying mechanism can be traced back to the lift of the lowest unoccupied molecular orbital (LUMO) level, which is caused by the attachment of methoxy radicals on ortho position of the phenyl ring in the post-irradiated PCBM structure. This work is of significance in understanding the radiation hardness and the damage mechanism of the PCBM film in radiation environments, which is essential before it is put into practical application in space.

Keywords: PCBM proton irradiation effects optical property molecular structure

Received: 07 September 2021
Revised: 12 October 2021
Accepted manuscript online:

PACS:	71.20.Tx	(Fullerenes and related materials; intercalation compounds)
	73.61.Wp	(Fullerenes and related materials)
	78.30.Na	(Fullerenes and related materials)
	78.66.Tr	(Fullerenes and related materials)

Fund: Project supported by the Youth Innovation Promotion Association,Chinese Academy of Sciences,the National Natural Science Foundation of China (Grant No.61874135),and the Foundation of Frontier Science of the Chinese Academy of Sciences (Grant No.ZDBS-LY-JSC015).

Corresponding Authors: Hui-Ping Zhu,E-mail:zhuhuiping@ime.ac.cn;Bo Li,E-mail:libo3@ime.ac.cn;Zheng-Sheng Han,E-mail:zshan@ime.ac.cn
E-mail: zhuhuiping@ime.ac.cn;libo3@ime.ac.cn;zshan@ime.ac.cn

About author: 2021-10-22

Cite this article:

Guo-Dong Xiong(熊国栋), Hui-Ping Zhu(朱慧平), Lei Wang(王磊), Bo Li(李博), Fa-Zhan Zhao(赵发展), and Zheng-Sheng Han(韩郑生) Evolution of optical properties and molecular structure of PCBM films under proton irradiation 2022 Chin. Phys. B 31 057102

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