Theoretical study on ferroelectric nitrides with super-wurtzite structures for solar energy conversion applications
文献情報
Xing-Yuan Chen, Jin-Long Yang, Li-Fang Chen, Hua-Kai Xu, Jin-Man Chen, Guo-Xia Lai, Xiang-Fu Xu, Hong Ji, Jia-Jun Tang, Yu-Jun Zhao
Polarized structured nitride semiconductors are attractive due to their unique and environment-friendly electronic properties. The stability, ferroelectricity and photocatalytic and photovoltaic properties of super-wurtzite Mg2XN3 (X = Bi, Mo, Nb, Sb, Ta, Tc and W) were determined based on first principles calculations in this study. The calculated results indicate that Mg2XN3 (X = Sb, Ta, Bi and Nb) are stable polar nitrides by phonon frequencies, elastic coefficients and ferroelectric analysis. Mg2XN3 (X = Sb, Ta and Nb) with large ferroelectric polarization strength could absorb ultraviolet light to promote photocatalytic water splitting for hydrogen production. Mg2BiN3 is a new excellent photovoltaic candidate due to its ideal energy band, high electron mobility, high absorption coefficient and large ferroelectric polarization strength.
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