Work function changes by 2D material coatings on LaB $_{6}$

Ogawa, Shuichi*; Yusa, Ryunosuke*; Wang, G.*; Pettes, M. T.*; Liu, F.*; Tsuda, Yasutaka ; Yoshigoe, Akitaka ; Abukawa, Tadashi*; Moody, N. A.*; Yamaguchi, Hisato*

LaB $_{6}$ has been used as a thermionic cathode due to its low work function, but it is also expected to be used as a photocathode by further lowering the work function. Here, we report photoemission electron microcopy (PEEM), thermionic emission electron microscopy (TEEM) and synchrotron radiation X-ray photoelectron spectroscopy (SR-XPS) study on the work function change of LaB $_{6}$ by coating with two-dimensional materials (graphene and hexagonal boron nitride (hBN)). A larger decrease of work function for the hBN coated LaB $_{6}$ (100) compared to graphene coated LaB $_{6}$ (100) was observed and qualitatively explained by our density functional theory (DFT) calculations.

Language	:	English
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Meeting title	:	International Thin Films Conference (TACT 2023)
Held date	:	2023/11
Location (city)	:	Taipei
Location (country)	:	Taiwan
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Keywords	:	LaB $_{6}$ ; 光電子顕微鏡; 熱電子顕微鏡; 放射光光電子分光; グラフェン; hBN; 電子源; 仕事関数; 第一原理計算
Research Facility	:	SPring-8(大型放射光施設)
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Registration No. : BB20230560
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