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Band Gap Engineering in Cs 2 (Na x Ag 1– x )BiCl 6 Double Perovskite Nanocrystals

2019; American Chemical Society; Volume: 10; Issue: 17 Linguagem: Inglês

10.1021/acs.jpclett.9b02168

1948-7185

Raman Singh Lamba, Pooja Basera, Saswata Bhattacharya, Sameer Sapra,

Quantum Dots Synthesis And Properties

Lead-free double perovskite materials, A2M(I)M'(III)X6, have recently attracted attention as environment-friendly alternatives to lead-based perovskites, APbX3, because of both rich fundamental science and potential applications. We report band gap tuning via alloying of Cs2AgBiCl6 nanocrystals (NCs) with nontoxic, abundant Na. It results in a series of Cs2NaxAg1-xBiCl6 (x = 0, 0.25, 0.5, 0.75, and 1) double perovskite NCs, leading to increase in optical band gap from 3.39 eV (x = 0) to 3.82 eV (x = 1) and 30-fold increment in weak photoluminescence. The tuning of band gap has been further explored by electronic structure calculation under the framework of density functional theory (DFT). The latter confirms that the increase in band gap is due to reduction of Ag contribution near valence band maxima (VBM) on incorporation of Na ion in place of Ag. These alloyed double perovskites can have useful potential applications in optoelectronic devices.