Perovskite type metal halides for photovoltaics and optoelectronic devices | A.K.M. Akther Hossain

The talk was delivered at the National Conference on Physics - 2021 (6 -7 August 2021) organized by Bangladesh Physical Society.

Title: Perovskite type metal halides for photovoltaics and optoelectronic devices
Speaker: A.K.M. Akther Hossain
Affiliation: Department of Physics, Bangladesh University of Engineering and Technology (BUET), Bangladesh

For the full presentation please visit:    • National Conference of Physics-2021  

Abstract: Perovskite type metal halides have fascinating optoelectronic properties such as tunable bandgap, high optical absorption, broad absorption spectrum, mechanically stable and highly ductile. These materials can be described by the general formula ABX3, where A is a cation, B is a metal ion and X is a halogen anion. These materials are nontoxic, abundant in nature, and inexpensive. Therefore, for fabrication of solar cell these materials would be cost-effective and more efficientcompared to that of silicon-based photovoltaic technology. The Density Functional Theory (DFT) based first principles calculations on Mn- and Ni doped CsGeCl3 halides showthat the absorption edge of both Ni and Mn-doped CsGeCl3 is shifted toward the low energy region (red shift) relative to the pristine one. Similar behaviouris also observed in Cr- and Mn-doped CsSnCl3.Mechanical properties demonstrates that the doped samples are mechanically stable and ductile as the pristine CsGeCl3 and CsSnCl3. The electronic properties shows that the excitation of photoelectrons is easier due to the formation of intermediate states in Mn-doped CsGeCl3, and the Cr- and Mn-doped CsSnCl3. As a result, Mn-doped CsGeCl3and CsSnCl3exhibits higher absorptivity in the visible region compared to that of corresponding pristine sample.Detailed investigation suggests that the Mn-doped CsGeCl3 and CsSnCl3 perovskitesare suitable candidates for the application in high performance solar cells and other potential optoelectronic devices.

Keywords: CsGeCl3, CsSnCl3 perovskite, DFT, metal-doping, electronic properties, optical properties, mechanical properties.