Tailoring of dielectric and transport properties of C3H7NH3PbIxBr3-x

• Published in: Materials letters 2021-11, Vol.302, p.130456, Article 130456
• Main Authors: Sengupta, Payal, Ray, Ruma
• Format: Article
• Language: English
• Subjects: Charge transport; Comparative studies; Conductivity; Dielectric properties; Electric modulus; Electrical properties; Energy harvesting; Frequency ranges; Hybrid perovskites; Materials science; Perovskites; Sol-gel method; Sol-gel processes; Solar energy; Transport properties
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2021.130456

•We dealt with promising hybrid perovskites C3H7NH3PbIxBr3-x (x = 0.0,3.0).•Dielectric const. of C3H7NH3PbBr3 is much higher than that of C3H7NH3PbI3.•Conductivity of C3H7NH3PbBr3 is significantly higher than that of C3H7NH3PbI3.•Asymmetrical nature of modulus represents the non-Debye type behavior of samples.•As temp. increases, the behaviors of both samples shift towards ideal Debye type. 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.