Work function measurement of Y-oxide/W(100) surface by using of PEEM and FEM

A cathode material of a low work function is needed to achieve a high performance electron source. We measured the work function of W(100) surface modified with Y
₂
O
₃
by using of photoemission electron microscope. The work function of Y-oxide/W(100) surface is measured to be 2.5eV. Field emission characteristics is measured with Y-oxide/W emitter and work function is estimated by N-F plots.