An X-ray detector device includes in one example a switching portion and a photodetecting portion connected to the switching portion. The photodetecting portion includes a bottom electrode, a semiconductor area disposed above the bottom electrode, and a top electrode disposed above the semiconductor area. The area of the top electrode is smaller than the area of a top surface of the semiconductor area.一種X光檢測器裝置，其在一個示例中包括：一開關部分；以及一光檢測部分，連接到該開關部分。該光檢測部分包括：一底部電極；一半導體區域，設置在該底部電極上方；以及一頂部電極，設置在該半導體區域上方。該頂部電極的面積小於該半導體區域的一頂表面的面積。
