Temperature Impact on Electrical Conductivity: Conductors vs Intrinsic & Doped Semiconductors

Hello,

I have a problem with the final exam question, which is:

"Present an analysis of the impact of temperature on changes in electrical conductivity of conductors and intrinsic and doped semiconductors"

As for the electrical conductivity of conductors (metals), the matter is simple, the resistance increases with increasing temperature and this increase depends on the temperature coefficient.
However, the problem arises with semiconductors. From what I know, in a general case their resistance decreases with increasing temperature. What is the difference in this matter between intrinsic and doped semiconductors ???

Please reply

greetings

ema1108 wrote:

What is the difference in this matter between intrinsic and doped semiconductors ???

Pretty big. In the former, with increasing temperature, the concentration of carriers (holes and electrons) increases "avalanche". There is a model for this but at the moment I unfortunately don't have it in my memory. Hence, the leadership also increases.
For the second type, the relationship is a bit different, as it can decrease and increase. It depends on the given temperature range and material. Read about thermistors (NTC, PTC and CTR).