Sr(Ag 1-
x
Li
x
) 2 Se 2 and [Sr 3 Se 2 ][(Ag 1-
x
Li
x
) 2 Se 2 ] Tunable Direct Band Gap Semiconductors
ABCD PBi
Sr(Ag 1-
x
Li
x
) 2 Se 2 and [Sr 3 Se 2 ][(Ag 1-
x
Li
x
) 2 Se 2 ] Tunable Direct Band Gap Semiconductors
Autor:
Zhou, Xiuquan
;
Wilfong, Brandon
;
Chen, Xinglong
;
Laing, Craig
;
Pandey, Indra R
;
Chen, Ying-Pin
;
Chen, Yu-Sheng
;
Chung, Duck-Young
;
Kanatzidis, Mercouri G
É parte de:
Angewandte Chemie (International ed.), 2023-03, Vol.62 (14), p.e202301191
Notas:
AC02-06CH11357
USDOE
Descrição:
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(Ag
Li
) Se layered phases. With increased LiOH/LiCl ratio or reaction temperature,
Li
partially substituted Ag to form solid solutions of Sr(Ag
Li
) Se with
x
up to 0.45. In addition, a new type of intergrowth compound [Sr Se ][(Ag
Li
) Se ] was synthesized upon further reaction of Sr(Ag
Li
) Se with SrSe. Both Sr(Ag
Li
) Se and [Sr Se ][(Ag
Li
) Se ] exhibit a direct band gap, which increases with increasing
Li
substitution (
x
). Therefore, the band gap of Sr(Ag
Li
) Se can be precisely tuned via fine-tuning
x
that is controlled by only the flux ratio and temperature.
Editor:
Germany: Wiley Blackwell (John Wiley & Sons)
Idioma:
Inglês