| 摘要 |
<p>PURPOSE:To obtain a photoelectric surface having sufficiently high photoelectric surface sensitivity for polycrystals and maintaining it for a long time by making the ratio of the alkali metal made of cesium or rubidium against semi-metals larger than that of another alkali metal. CONSTITUTION:One or two kinds selected from cesium and rubidium and another alkali metal are introduced directly or via an intermediate layer 3 on polycrystals of CsI/Na or the like until the photoelectric current is sufficiently saturated, then one kind or two or more kinds of semi-metals 5 are deposited to form a photoelectric surface 6. The ratio of the alkali metal 4 made of cesium or rubidium or their combination against the semi-metals 5 is made larger than that of another alkali metal. The long-life photoelectric surface having high photoelectric surface sensitivity and maintaining it for a long time can be obtained.</p> |
