Sr(Ag1-xLix)(2)Se-2 and [Sr3Se2][(Ag1-xLix)(2)Se-2] Tunable Direct Band Gap Semiconductors
Angewandte Chemie (International ed. in English)(2023)
Abstract
Synthesizing solids in molten fluxes enables the rapid diffusion of soluble species at temperatures lower than in solid-state reactions, leading to crystal formation of kinetically stable compounds. In this study, we demonstrate the effectiveness of mixed hydroxide and halide fluxes in synthesizing complex Sr/Ag/Se in mixed LiOH/LiCl. We have accessed a series of two-dimensional Sr(Ag1-xLix)(2)Se-2 layered phases. With increased LiOH/LiCl ratio or reaction temperature, Li partially substituted Ag to form solid solutions of Sr(Ag1-xLix)(2)Se-2 with x up to 0.45. In addition, a new type of intergrowth compound [Sr3Se2][(Ag1-xLix)(2)Se-2] was synthesized upon further reaction of Sr(Ag1-xLix)(2)Se-2 with SrSe. Both Sr(Ag1-xLix)(2)Se-2 and [Sr3Se2][(Ag1-xLix)(2)Se-2] exhibit a direct band gap, which increases with increasing Li substitution (x). Therefore, the band gap of Sr(Ag1-xLix)(2)Se-2 can be precisely tuned via fine-tuning x that is controlled by only the flux ratio and temperature.
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Key words
2D Materials,Chalcogenides,Flux Synthesis,Semiconductor
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