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Sr(Ag1-xLix)2Se2 and [Sr3Se2][(Ag1-xLix)2Se2] Tunable Direct Band Gap Semiconductors

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [2];  [1];  [3];  [3];  [4];  [4];  [1];  [5]
  1. Argonne National Lab. (ANL), Lemont, IL (United States). Materials Science Division
  2. US Naval Academy, Annapolis, MD (United States)
  3. Northwestern Univ., Evanston, IL (United States)
  4. Univ. of Chicago, Lemont, IL (United States). NSF's ChemMatCARS
  5. 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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