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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Terahertz Modulation of Silicon-Based Lead-Free Small-Bandgap Cs2CuSbCl6 Double Perovskite Nanocrystals

by
Xintian Song
,
Zhongxin Zhang
,
Reyihanguli Tudi
,
Abulimiti Yasen
,
Mei Xiang
* and
Bumaliya Abulimiti
*
Xinjiang Key Laboratory for Luminescence Minerals and Optical Functional Materials, School of Physics and Electronic Engineering, Xinjiang Normal University, Urumqi 830054, China
*
Authors to whom correspondence should be addressed.
Optics 2026, 7(1), 5; https://doi.org/10.3390/opt7010005
Submission received: 9 December 2025 / Revised: 24 December 2025 / Accepted: 30 December 2025 / Published: 4 January 2026
(This article belongs to the Special Issue Terahertz Optics: Sciences, Technologies and Applications)
Versions Notes

Abstract

In this work, we synthesized a lead-free halide double perovskite, Cs2CuSbCl6, with high carrier mobility via a one-pot hot-injection method. When combined with a high-resistivity silicon wafer, it forms a Type-II heterojunction structure, and its modulation depth reaches 84% by adjusting the annealing temperature. It demonstrates promising modulation performance at 532 nm. Owing to its strong absorption in the ultraviolet region, Cs2CuSbCl6 shows potential for application in ultraviolet-controlled terahertz modulation.
Keywords: terahertz modulation; lead-free halide double perovskite; heterojunction terahertz modulation; lead-free halide double perovskite; heterojunction

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MDPI and ACS Style

Song, X.; Zhang, Z.; Tudi, R.; Yasen, A.; Xiang, M.; Abulimiti, B. Terahertz Modulation of Silicon-Based Lead-Free Small-Bandgap Cs2CuSbCl6 Double Perovskite Nanocrystals. Optics 2026, 7, 5. https://doi.org/10.3390/opt7010005

AMA Style

Song X, Zhang Z, Tudi R, Yasen A, Xiang M, Abulimiti B. Terahertz Modulation of Silicon-Based Lead-Free Small-Bandgap Cs2CuSbCl6 Double Perovskite Nanocrystals. Optics. 2026; 7(1):5. https://doi.org/10.3390/opt7010005

Chicago/Turabian Style

Song, Xintian, Zhongxin Zhang, Reyihanguli Tudi, Abulimiti Yasen, Mei Xiang, and Bumaliya Abulimiti. 2026. "Terahertz Modulation of Silicon-Based Lead-Free Small-Bandgap Cs2CuSbCl6 Double Perovskite Nanocrystals" Optics 7, no. 1: 5. https://doi.org/10.3390/opt7010005

APA Style

Song, X., Zhang, Z., Tudi, R., Yasen, A., Xiang, M., & Abulimiti, B. (2026). Terahertz Modulation of Silicon-Based Lead-Free Small-Bandgap Cs2CuSbCl6 Double Perovskite Nanocrystals. Optics, 7(1), 5. https://doi.org/10.3390/opt7010005

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