Sr(Ag1-xLix)2Se2 and [Sr3Se2][(Ag1-xLix)2Se2] Tunable Direct Band Gap Semiconductors
Journal Article
·
· Angewandte Chemie (International Edition)
- Argonne National Lab. (ANL), Lemont, IL (United States). Materials Science Division
- US Naval Academy, Annapolis, MD (United States)
- Northwestern Univ., Evanston, IL (United States)
- Univ. of Chicago, Lemont, IL (United States). NSF's ChemMatCARS
- Argonne National Lab. (ANL), Lemont, IL (United States). Materials Science Division; Northwestern Univ., Evanston, IL (United States)
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. Here, 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)2Se2 layered phases. With increased LiOH/LiCl ratio or reaction temperature, Li partially substituted Ag to form solid solutions of Sr(Ag1-xLix)2Se2 with x up to 0.45. In addition, a new type of intergrowth compound [Sr3Se2][(Ag1-xLix)2Se2] was synthesized upon further reaction of Sr(Ag1-xLix)2Se2 with SrSe. Both Sr(Ag1-xLix)2Se2 and [Sr3Se2][(Ag1-xLix)2Se2] exhibit a direct band gap, which increases with increasing Li substitution (x). Therefore, the band gap of Sr(Ag1-xLix)2Se2 can be precisely tuned via fine-tuning x that is controlled by only the flux ratio and temperature.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1969738
- Alternate ID(s):
- OSTI ID: 1958357
- Journal Information:
- Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 14 Vol. 62; ISSN 1433-7851
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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OSTI ID:21212114