Abstract
Hybrid perovskites have drawn immense attention among researchers due to its attracting applications in solar energy harvesting. C3H7NH3PbIxBr3-x(0≤x≤3), promising hybrid alkylammonium perovskites with tunable band gap and better stability, need to be explored. A comparative study of various electrical properties of sol–gel derived C3H7NH3PbIxBr3-x(x=0.0,3.0) are carried out over the frequency range 4Hz≤f≤8MHz in the temperature range 300K≤T≤373K. Dielectric constant of C3H7NH3PbIxBr3-x is enhanced appreciably over the temperature range of investigation for complete substitution of I by Br. Deviation of non-Debye type responses from ideal Debye type behaviour of imaginary part of electric modulus is revealed from Kohlrausch-Williams-Watts analysis. AC conductivity is found to be raised considerably in C3H7NH3PbBr3 and conductivity of both samples may be explained with correlated barrier hoppingmechanism. The higher value of activation energy in C3H7NH3PbBr3 plays an important role in charge transport.
Published Version
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