Insight into the crystal phase and shape evolution from monoclinic Cu1.94S to wurtzite Cu2ZnSnS4 nanocrystals†,CrystEngComm

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Insight into the crystal phase and shape evolution from monoclinic Cu1.94S to wurtzite Cu2ZnSnS4 nanocrystals†
CrystEngComm ( IF 2.6 ) Pub Date : 2018-03-21 00:00:00 , DOI: 10.1039/c8ce00048d
Xiaoyan Zhang _{1,

2,

3,

4,

5} , You Xu _{1,

2,

3,

4,

5} , Chao Pang _{1,

2,

3,

4,

5} , Yifeng Wang _{3,

4,

6,

7} , Liming Shen _{1,

2,

3,

4,

5} , Arunava Gupta _{8,

9,

10,

11} , Ningzhong Bao _{1,

2,

3,

4,

5}

Affiliation

Phase pure wurtzite Cu₂ZnSnS₄ (CZTS) nanocrystals have been prepared by using monoclinic Cu_1.94S nanoplates as starting materials via a hot-injection method. The rapid injection of Zn-thiols resulted in the symmetrical growth of CZTS onto both sides of Cu_1.94S nanoplates, yielding sandwich-like CZTS-Cu_1.94S heterostructures, which finally converted into CZTS nanocrystals. Interestingly, with 50% excess Sn precursor in the initial reaction system, the morphology of CZTS can retain the shape of nanoplates with increased thickness. The morphology and crystal phase evolution processes have been further investigated to understand the formation mechanism. These findings are meaningful for the controllable synthesis of copper chalcogenide nanocrystals as well as their photoelectrical applications.

中文翻译：

从单斜晶Cu _1.94 S到纤锌矿Cu ₂ ZnSnS ₄纳米晶体的晶体相和形状演变的见解†

以单斜晶Cu _1.94 S纳米片为原料，通过热注入法制备了相纯纤锌矿Cu ₂ ZnSnS ₄（CZTS）纳米晶。Zn-硫醇的快速注入导致CZTS在Cu _1.94 S纳米板的两侧对称生长，产生夹心状CZTS-Cu _1.94S异质结构，最终转化为CZTS纳米晶体。有趣的是，初始反应系统中含50％的Sn前体时，CZTS的形态可以保留厚度增加的纳米板的形状。形态和晶体相演变过程已被进一步研究，以了解形成机理。这些发现对于可控制地合成硫属硫化物纳米晶体及其光电应用是有意义的。

更新日期：2018-03-21

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