LDR theory

[Martin Czech]

:::Well I remember reading something about LDRs in "Bauer/Wegener
:::Elektronische Bauelemente). Don't know if it covered temperature effects
:::however. My guess would be that their behaviour will be similar in nature
:::to NTCs which aren't devices with definite junctions as well. 
:::The resistance depends exponential to T in these and I'd expect the same
:::for a LDR in total darkness. Since additional carriers may be generated
:::using the same mechanism.
:::
:::Bye,
::: René

Yes, that's what I thoughty , too. The unavoidable exp{Kt/q}.
But then there is trapping, indirect band gap jumping, all
those impurities and carrier lifetime....
The diode theory can assume an ideal crystal with reason,
whereas this fotocell stuff needs all the dirty effects.

Anyway, we have to buy what's on the market.
There seem to be different flavours, low resistance and fast,
or high resistance and slow.


m.c.