# Common base configuration, input V-I characteristics

In input characteristics of a common base transistor input current Ie increases with increase in output voltage Vcb. I know the answer is something to do with early effect, "the answer says that because of early effect the number of recombination at the base decreases and thus the input current increases."I want to know why decrease in number of recombinations at base increases the input current.

When Vcb increases, CB junction width increases, while EB junction width decreases. The result of this is -> less recombination of electrons and holes at EB junction. It means more electrons can now flow between B and E. Which implies that emitter current, Ie increases. Now we know in CB configuration: $$I_C = \alpha I_E$$