纯净的半导体材料是不容易找到的。我用掺杂后的半导体材料(晶体管代替)来作半导体的热敏特性和光敏特性演示,效果较好,现介绍如下: 一、热敏特性演示: 把一只金属外壳的3AX81晶体管(或其它型号的金属外壳低频晶体管)与演示用的 Pure semiconductor material is not easy to find. I doped semiconductor materials (transistors instead) for the semiconductor thermal characteristics and photosensitive properties of the demonstration, the effect is better, are described below: First, the thermal characteristics of the demonstration: the metal shell 3AX81 transistor (or other Model of the metal shell low-frequency transistors) and demo