| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a photocathode for an ultraviolet ray, which can achieve high quantum efficiency, and to provide an electron tube having the same. <P>SOLUTION: The photocathode 1 has a support substrate 11 composed of a compound semiconductor of a monocrystal, a light-absorbing layer 13 arranged on the support substrate 11, having an energy band gap smaller than the support substrate 11 and generating a photoelectron by absorbing the incident light transmitted through the support substrate 11, and a surface layer 15 arranged on the light-absorbing layer 13 and reducing a work function of the light-absorbing layer 13. The support substrate 11 is formed of Al<SB>(1-X)</SB>Ga<SB>X</SB>N(0≤X<1), and the light-absorbing layer 13 is formed of the compound semiconductor composed of at least one component selected from a group composed of Al, Ga and In and N. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
