Deterministic Two-Dimensional Polymorphism Growth of Hexagonal n-Type SnS2 and Orthorhombic p-Type SnS Crystals

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• 作者：Ji-Hoon Ahn ; Myoung-Jae Lee ; Hoseok Heo ; Ji Ho Sung ; Kyungwook Kim ; Hyein Hwang ; Moon-Ho Jo
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：June 10, 2015
• 年：2015
• 卷：15
• 期：6
• 页码：3703-3708
• 全文大小：405K
• ISSN：1530-6992

文摘

van der Waals layered materials have large crystal anisotropy and crystallize spontaneously into two-dimensional (2D) morphologies. Two-dimensional materials with hexagonal lattices are emerging 2D confined electronic systems at the limit of one or three atom thickness. Often these 2D lattices also form orthorhombic symmetries, but these materials have not been extensively investigated, mainly due to thermodynamic instability during crystal growth. Here, we show controlled polymorphic growth of 2D tin-sulfide crystals of either hexagonal SnS₂ or orthorhombic SnS. Addition of H₂ during the growth reaction enables selective determination of either n-type SnS₂ or p-type SnS 2D crystal of dissimilar energy band gap of 2.77 eV (SnS₂) or 1.26 eV (SnS) as a final product. Based on this synthetic 2D polymorphism of p鈥?i>n crystals, we also demonstrate p鈥?i>n heterojunctions for rectifiers and photovoltaic cells, and complementary inverters.