Lead-Free and Stable Potassium Titanium Halide Perovskites: Synthesis, Characterization and Solar Cell Simulation

Saranya Kumar and Malathi Murugesan ()
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Saranya Kumar: Condensed Matter Research Laboratory, School of Advanced Sciences, Vellore Institute of Technology, Vellore 632014, India
Malathi Murugesan: Condensed Matter Research Laboratory, School of Advanced Sciences, Vellore Institute of Technology, Vellore 632014, India

Energies, 2022, vol. 15, issue 19, 1-14

Abstract: Titanium based double perovskites have shown good optical properties along with remarkable stability, making them promising lead-free perovskites for optoelectronic applications. In this work, Potassium Titanium Halide (K 2 TiBr 6, K 2 TiI 6 and K 2 TiI 2 Br 4 ) double perovskites are synthesized for the first time. Surface topology and chemical composition are studied. Photoluminescence characterization shows a peak in the UV region. The perovskites exhibit quasi bandgap with K 2 TiI 6 having 1.62 eV direct bandgap, conducive for single junction solar cell fabrication. K 2 TiBr 6 and K 2 TiI 2 Br 4 have bandgaps 2.14 eV and 2.44 eV, respectively, which is favorable for tandem solar cell application. The decomposition temperature of K 2 TiI 6 is notable at 678 °C, bestowing it with stability in ambient atmosphere. Inherent to its optical properties, Solar Cell Capacitance Simulator-1D (SCAPS-1D) is used to simulate perovskite solar cell (PSC) with K 2 TiI 6 as the absorber. Utilizing the absorption data from UV-Vis spectroscopy, these PSCs are designed to give maximum efficiency. Upon numerical optimization of perovskite layer thickness, we propose an efficient, practically realizable PSC with a power conversion efficiency of 4.382%. Besides, various electron and hole transport layers are investigated and the effect of their thickness on the PSC performance are studied.

Keywords: lead-free perovskites; inorganic and stable perovskites; photovoltaic cells; optoelectronics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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