Substrate effects on surface activation processes of graphene/metal composite photocathodes

Song Tang; Yijun Zhang; Gangcheng Jiao; Feng Shi; Dongzhi Wang; Zehao Tong; Yu Jiang; Guanghui Hao

doi:10.1117/12.2687574

28 November 2023 Substrate effects on surface activation processes of graphene/metal composite photocathodes

Song Tang, Yijun Zhang, Gangcheng Jiao, Feng Shi, Dongzhi Wang, Zehao Tong, Yu Jiang, Guanghui Hao

Proceedings Volume 12764, Optoelectronic Devices and Integration XII; 127640E (2023) https://doi.org/10.1117/12.2687574
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

Graphene is considered a suitable atomically thick layer on photocathodes, and the photoemission performance of the graphene-covered photocathodes can be enhanced through Cs/O activation. To investigate the effects of the substrate materials beneath the graphene layer on Cs/O deposition and photoemission performance. We compare the activation processes and photoemission performances of few-layer graphene supported by nickel and copper to investigate the effects of the substrate materials beneath the graphene layer on Cs/O deposition and photoemission performance. By Cs/O activation, the nickel-supported few-layer graphene can possess a higher response at 405 nm, while the copper-supported cathode can acquire a wider spectral response and better stability. After degradation, we discover that the samples supported by nickel and copper can act differently through the additional Cs/O deposition processes, while the surface barrier heights of both samples are further decreased.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Song Tang, Yijun Zhang, Gangcheng Jiao, Feng Shi, Dongzhi Wang, Zehao Tong, Yu Jiang, and Guanghui Hao "Substrate effects on surface activation processes of graphene/metal composite photocathodes", Proc. SPIE 12764, Optoelectronic Devices and Integration XII, 127640E (28 November 2023); https://doi.org/10.1117/12.2687574

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