High-Throughput Screening for Band gap Engineering by Sublattice Mixing of Cs$_2$AgBiCl$_6$ from First-Principles

Deepika Gill; Preeti Bhumla; Manish Kumar; Saswata Bhattacharya

doi:10.1088/2515-7639/abe7d6

paper

High-Throughput Screening for Band gap Engineering by Sublattice Mixing of Cs $_{2}$ AgBiCl $_{6}$ from First-Principles

arXiv:2006.00183 · doi:10.1088/2515-7639/abe7d6

Abstract

The lead-free double perovskite material (viz. Cs $_{2}$ AgBiCl $_{6}$ ) has emerged as an efficient and environmentally friendly alternative to lead halide perovskites. To make Cs $_{2}$ AgBiCl $_{6}$ optically active in the visible region of solar spectrum, band gap engineering approach has been undertaken. Using Cs $_{2}$ AgBiCl $_{6}$ as a host, band gap and optical properties of Cs $_{2}$ AgBiCl $_{6}$ have been modulated by alloying with M(I), M(II), and M(III) cations at Ag-/Bi-sites. Here, we have employed density functional theory (DFT) with suitable exchange-correlation functionals in light of spin-orbit coupling (SOC) to determine the stability, band gap and optical properties of different compositions, that are obtained on Ag-Cl and Bi-Cl sublattices mixing. On analyzing the 64 combinations within Cs $_{2}$ AgBiCl $_{6}$ , we have identified 19 promising configurations having band gap sensitive to solar cell applications. The most suitable configurations with Ge(II) and Sn(II) substitutions have spectroscopic limited maximum efficiency (SLME) of 32.08% and 30.91%, respectively, which are apt for solar cell absorber.

High-Throughput Screening for Band gap Engineering by Sublattice Mixing of Cs $_{2}$ AgBiCl $_{6}$ from First-Principles

Abstract

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High-Throughput Screening for Band gap Engineering by Sublattice Mixing of Cs2​AgBiCl6​ from First-Principles

Abstract

References in corpus (4)

Cited by in corpus (2)

High-Throughput Screening for Band gap Engineering by Sublattice Mixing of Cs $_{2}$ AgBiCl $_{6}$ from First-Principles