单纯从导电性能来看,半导体既不能很好地传导电流,又不能可靠地隔绝电流,所以,它在电工和电子技术领域中,曾长期受到冷落。直到1948年发明了晶体管,人们才发现了半导体的许多特性。 1.热敏特性半导体的电阻率随温度会发生明显地改变,例如纯锗,温度每升高10℃,它的电阻率就要减小到原来的二分之一。温度的细微变化,能从半导体电阻率的明显变化上反映出来。利用半导体的热敏特性,可制作感温元件——热敏电阻,用于温度 Merely from the conductive properties of view, the semiconductor neither good current conduction, and can not be reliably isolated current, so it in the field of electrical and electronic technology, has long been neglected. It was not until 1948 that transistors were invented that many of the properties of semiconductors were discovered. 1. Thermal Characteristics The resistivity of semiconductors varies significantly with temperature. For example, pure germanium, its resistivity will be reduced to half of its original value for every 10 ° C increase in temperature. Subtle changes in temperature can be reflected in significant changes in the resistivity of the semiconductor. The use of semiconductor thermal characteristics, can be made of temperature sensing components - thermistor, for temperature