Ammonothermal Synthesis of Earth-Abundant Nitride Semiconductors ZnSiN2 and ZnGeN2 and Dissolution Monitoring by In Situ X-ray Imaging
Häusler J, Schimmel S, Wellmann P, Schnick W (2017)
Publication Language: English
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2017
Journal
Publisher: Wiley-VCH Verlag
Book Volume: 23
Pages Range: 12275-12282
Journal Issue: 50
Abstract
In this contribution, first synthesis of semiconducting ZnSiN2 and ZnGeN2 from solution is reported with supercritical ammonia as solvent and KNH2 as ammonobasic mineralizer.
The reactions were conducted in custom-built highpressure autoclaves made of nickel-based superalloy. The nitrides were characterized by powder X-ray diffraction and their crystal structures were refined by the Rietveld method. ZnSiN2 (a=5.24637(4), b=6.28025(5), c=5.02228(4) a, Z=4, Rwp=0.0556) and isotypic ZnGeN2 (a=5.46677(10), b=6.44640(12), c=5.19080(10) a, Z=4, Rwp=0.0494) crystallize in the orthorhombic space group Pna21 (no. 33). The morphology and elemental composition of the nitrides were examined by electron microscopy and energy-dispersive X-ray spectroscopy (EDX). Well-defined single crystals with a diameter up to 7 mm were grown by ammonothermal synthesis at temperatures between 870 and 1070 K and pressures up to 230 MPa. Optical properties have been analyzed with diffuse reflectance measurements. The band gaps of ZnSiN2 and ZnGeN2 were determined to be 3.7 and 3.2 eV at room temperature, respectively. In situ X-ray measurements were performed to exemplarily investigate the crystallization mechanism of ZnGeN2. Dissolution in ammonobasic supercritical ammonia between 570 and 670K was observed which is
quite promising for the crystal growth of ternary nitrides under ammonothermal conditions.
Authors with CRIS profile
Saskia Schimmel
Professur für Werkstoffwissenschaften (Werkstoffe der Elektrotechnik)
Peter Wellmann
Professur für Werkstoffwissenschaften (Werkstoffe der Elektrotechnik)
Involved external institutions
Germany (DE)How to cite
APA:
Häusler, J., Schimmel, S., Wellmann, P., & Schnick, W. (2017). Ammonothermal Synthesis of Earth-Abundant Nitride Semiconductors ZnSiN2 and ZnGeN2 and Dissolution Monitoring by In Situ X-ray Imaging. Chemistry - A European Journal, 23(50), 12275-12282. https://dx.doi.org/10.1002/chem.201701081
MLA:
Häusler, Jonas, et al. "Ammonothermal Synthesis of Earth-Abundant Nitride Semiconductors ZnSiN2 and ZnGeN2 and Dissolution Monitoring by In Situ X-ray Imaging." Chemistry - A European Journal 23.50 (2017): 12275-12282.
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