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

Xiuquan Zhou; Brandon Wilfong; Xinglong Chen; Craig Laing; Indra R. Pandey; Ying Pin Chen; Yu Sheng Chen; Duck Young Chung; Mercouri G. Kanatzidis

doi:10.1002/anie.202301191

Sr(Ag_1−xLi_x)₂Se₂ and [Sr₃Se₂][(Ag_1−xLi_x)₂Se₂] Tunable Direct Band Gap Semiconductors

Xiuquan Zhou, Brandon Wilfong, Xinglong Chen, Craig Laing, Indra R. Pandey, Ying Pin Chen, Yu Sheng Chen, Duck Young Chung, Mercouri G. Kanatzidis^*

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

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(Ag_1−xLi_x)₂Se₂ layered phases. With increased LiOH/LiCl ratio or reaction temperature, Li partially substituted Ag to form solid solutions of Sr(Ag_1−xLi_x)₂Se₂ with x up to 0.45. In addition, a new type of intergrowth compound [Sr₃Se₂][(Ag_1−xLi_x)₂Se₂] was synthesized upon further reaction of Sr(Ag_1−xLi_x)₂Se₂ with SrSe. Both Sr(Ag_1−xLi_x)₂Se₂ and [Sr₃Se₂][(Ag_1−xLi_x)₂Se₂] exhibit a direct band gap, which increases with increasing Li substitution (x). Therefore, the band gap of Sr(Ag_1−xLi_x)₂Se₂ can be precisely tuned via fine-tuning x that is controlled by only the flux ratio and temperature.

Original language	English (US)
Article number	e202301191
Journal	Angewandte Chemie - International Edition
Volume	62
Issue number	14
DOIs	https://doi.org/10.1002/anie.202301191
State	Published - Mar 27 2023

Keywords

2D Materials
Chalcogenides
Flux Synthesis
Semiconductor

ASJC Scopus subject areas

Catalysis
General Chemistry

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10.1002/anie.202301191

Cite this

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title = "Sr(Ag1−xLix)2Se2 and [Sr3Se2][(Ag1−xLix)2Se2] Tunable Direct Band Gap Semiconductors",

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)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.",

keywords = "2D Materials, Chalcogenides, Flux Synthesis, Semiconductor",

author = "Xiuquan Zhou and Brandon Wilfong and Xinglong Chen and Craig Laing and Pandey, {Indra R.} and Chen, {Ying Pin} and Chen, {Yu Sheng} and Chung, {Duck Young} and Kanatzidis, {Mercouri G.}",

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language = "English (US)",

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T1 - Sr(Ag1−xLix)2Se2 and [Sr3Se2][(Ag1−xLix)2Se2] Tunable Direct Band Gap Semiconductors

AU - Zhou, Xiuquan

AU - Wilfong, Brandon

AU - Chen, Xinglong

AU - Laing, Craig

AU - Pandey, Indra R.

AU - Chen, Ying Pin

AU - Chen, Yu Sheng

AU - Chung, Duck Young

AU - Kanatzidis, Mercouri G.

PY - 2023/3/27

Y1 - 2023/3/27

N2 - 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)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.

AB - 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)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.

KW - 2D Materials

KW - Chalcogenides

KW - Flux Synthesis

KW - Semiconductor

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Sr(Ag_1−xLi_x)₂Se₂ and [Sr₃Se₂][(Ag_1−xLi_x)₂Se₂] Tunable Direct Band Gap Semiconductors

Abstract

Keywords

ASJC Scopus subject areas

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CSD 2192156: Experimental Crystal Structure Determination

CSD 2192158: Experimental Crystal Structure Determination

CSD 2192155: Experimental Crystal Structure Determination

Cite this

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

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Datasets

CSD 2192156: Experimental Crystal Structure Determination

CSD 2192158: Experimental Crystal Structure Determination

CSD 2192155: Experimental Crystal Structure Determination

Cite this

Sr(Ag_1−xLi_x)₂Se₂ and [Sr₃Se₂][(Ag_1−xLi_x)₂Se₂] Tunable Direct Band Gap Semiconductors