Responsivlty increases sllghtly with applied reverse blas due to lmproved charge collection efficiency in the photodiode Also there are responsivity varlations due to change in temperature as shown in figure 6. This is due to decrease or increase of the band gap. because of increase or decrease in the temperature respectively. Spectral responsivity may vary from lot to lot and it is dependent on wavelength.However the relatlve varlations in reponsivity can be reduced to less than 1% on a selecled basls.