テルル化カドミウム

解説

CdTe(240.01)．テルル化カドミウム, TeとCdの溶融のほか，水溶液中でCdCl2とH2Teとを反応させるか，Al2Te3とCd塩との反応などで得られる．H2 中で昇華精製できる．黒褐色の立方晶系結晶．せん亜鉛鉱型構造．ただし，高圧下では岩塩型構造になる．密度6.2 g cm－3．融点1041 ℃．湿った空気にさらすと酸化される．水や一般の希酸に不溶．硝酸では分解される．Ⅱ-Ⅵ化合物半導体．バンドギャップ1.44 eV(極低温では1.56 eV)．半導体，りん光体の材料に用いられる．森北出版「化学辞典（第2版）

化学的特性

Brownish-black, cubic crystals.Oxidizes on prolonged expo- sure to moist air. Insoluble in water and mineral acids except nitric, in which it is soluble with decomposition.

使用

Cadmium telluride finds applications as the semiconductor material in photovoltaics and infrared optical window. It is used in the production of thin film solar cells. It is doped with chlorine and used as a radiation detector for x-rays, alfa and beta particles. .

一般的な説明

CdTe is a photonic material. Crystal structure of CdTe is zinc blende structure. 3CdTe is usually an obvious choice for photovoltaic applications because of its; low cost, direct band gap (1.44eV),3 high absorption coefficient, easily doped with p and n type dopants by several preparation techniques. 2

危険性

Toxic by inhalation.

Structure and conformation

The space lattice of CdTe (Cadmium telluride) belongs to the cubic system, and the zinc-blend type structure has a lattice constant of a=0.646 nm and the nearest neighbor atomic distance of 0.279 nm. The cleavage plane is (110).