| 학회 | 한국재료학회 |
| 학술대회 | 2021년 가을 (11/24 ~ 11/26, 경주 라한호텔) |
| 권호 | 27권 2호 |
| 발표분야 | E. 환경/센서 재료 분과 |
| 제목 | Comparative analysis study on PVT-synthesized Hg2Br2 and Hg2BrxCl2-x crystals |
| 초록 | Mercurous bromide (Hg2Br2) single crystals have several advantages for acousto-optic tunable filters (AOTFs), such as a relatively wide optical transmission band (0.4–30 μm), high refractive index, and a relatively high figure of merit. Although various studies about Hg2Br2 crystals have been examined to improve crystallinity, few studies have explored the comparison between Hg2Br2 and Hg2BrxCl2-x crystals in terms of their physical properties. In depth study about the effect of impurity in Hg2Br2 crystal should be conducted to fabricate high-performance AOTFs. In this study, we comparatively analyzed the physical properties of Hg2Br2 and Hg2BrxCl2-x crystals synthesized via physical vapor transport (PVT) using powder of different purities. Prior to crystal growth, scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS) analysis showed the presence of Cl atoms (2.62%) in Hg2BrxCl2-x powder; however, Cl atoms were not detected in Hg2Br2 powder. The as-grown single crystals were characterized by X-ray photoelectron spectroscopy (XPS) and Raman spectra, which confirmed Cl peak and Hg–Cl bonds in the Hg2BrxCl2-x crystal. No clear Cl 2p peaks were observed for the Hg2Br2 crystal, whereas for the Hg2BrxCl2-x crystal, an initial peak was observed at a binding energy of 198.57 eV. Additionally, the difference in crystallinity due to the existence of Cl in Hg2Br2 crystal was examined using full width at half maximum (FWHM) value calculated from X-ray diffraction (XRD). In conclusion, the studies of the growth mechanism will provide a chance to synthesize high quality Hg2Br2 crystals for potential AOTF device applications. |
| 저자 | Ojun Kwon1, Shi-Gwan Woo2, Byungjin Cho3 |
| 소속 | 1Department of Advanced Material Engineering, 2Chungbuk National Univ., 3Department of Urban |
| 키워드 | |
