Improvement of the THz response of Zn1−xMnxTe bulk crystals grown by a temperature gradient solution method12. Issue 22 (23rd May 2017)

• Record Type: Journal Article
• Authors: Xu, Yadong; Dong, Jiangpeng; Zheng, Hongjian; Xiao, Bao; Ji, Leilei; He, Yihui; Zhang, Caihong; Zhang, Binbin; Jie, Wanqi
• Is Part Of: CrystEngComm. Volume 19:Issue 22(2017)
• Page Start: 3051
• Page End: 3057
• Publication Date: 2017-05-23
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c7ce00463j
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Zn1− x Mn x Te bulk crystals were grown by a temperature gradient solvent method under Te-rich conditions and showed 15–25% higher sensitivity to THz compared to intrinsic ZnTe. Abstract : As a type of A II 1− x Mn x B VI alloy, Zn1− x Mn x Te ingots with a diameter of 30 mm are grown as large single crystals by a temperature gradient solvent method under Te-rich conditions. The orange-red Zn1− x Mn x Te crystals are cut and processed into size-appropriate wafers for fundamental studies, as well as for THz spectroscopy and magnetization response analyses. Mn segregation associated with the growth conditions is identified in the as-grown crystals, and an enriched higher concentration of Mn is observed inside the Te inclusion. To evaluate the effect of Mn on the Zn1− x Mn x Te crystal, the site occupation is calculated via an ab initio study, and is further confirmed by electrical and optical property measurements. Mn tends to substitute Zn to form MnZn in Zn1− x Mn x Te, which results in a low density of free charge carriers, through which the THz detection sensitivity is enhanced by 15–25% compared to the intrinsic ZnTe. Moreover, evident paramagnetic magnetization behavior is observed at variable temperatures due to the random distribution of an isolated Mn (Mnioct, Te6 ) spin with S = 5/2. We note that further optimization of the THz performance can be achieved by optimizing the growth process and tailoring the Mn content.