Synthesis and investigation of environmental protection and earth-abundant kesterite Cu2MgxZn1-xSn(S,Se)4 thin films for solar cells

Synthesis and investigation of environmental protection and earth-abundant kesterite Cu2MgxZn1-xSn(S,Se)4 thin films for solar cells
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环保资源丰富的黄锡矿Cu2MgxZn1-xSn(S,Se)4太阳能电池薄膜的合成与研究

DOI:
10.1016/j.ceramint.2018.05.167
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发表时间:
2018-09
影响因子:
5.2
通讯作者:
Bin Yao
Bin Yao
中科院分区:
材料科学1区
文献类型:
--
作者:
Yu Zhang;Dongyue Zhang;Yingrui Sui;Yanjie Wu;Zhanwu Wang;Lili Yang;Fengyou Wang;Shiquan Lv;Bin Yao

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采用简单的溶胶-凝胶法合成了Cu2MgxZn1-xSn2(S,Se)4(0 ≤ x ≤ 0.6)薄膜,系统地研究了不同浓度的镁离子对Cu2MgxZn1-xSn4(S,Se)4薄膜的晶体结构、表面形貌和光电性能的影响。结果表明,Cu2ZnSn2(S,Se)4相中较小的锌离子将被较大的Mg2+取代,形成均匀的纯相Cu2MgxZN1-xSn4(S,Se)4。当x值从0变化到0.6时,Cu2MgxZn1-xSn4薄膜的禁带宽度可从1.12 eV调整到0.88 eV。在x = 为0.2时,得到了晶粒尺寸较大、表面光滑、晶界较少的Cu2MgxZn1-xSnx(S,Se)4薄膜。薄膜的载流子浓度达到最大值6.47 × 1018 cm−3At x = 0.2,是一种很有潜力的高效太阳电池吸收层材料。
We have synthesized Cu2MgxZn1–xSn(S,Se)4(0 ≤ x ≤ 0.6) thin films by a facile sol-gel method, and studied the influence of Mg concentration on the crystal structure, surface morphology and photoelectric performance of Cu2MgxZn1–xSn(S,Se)4thin films systematically. It was shown that the smaller Zn2+in Kesterite phase Cu2ZnSn(S,Se)4will be replaced by larger Mg2+, forming uniform pure phase Cu2MgxZn1–xSn(S,Se)4. The band gap of Cu2MgxZn1–xSn(S,Se)4films can be adjusted from 1.12 to 0.88 eV as the x value changes from 0 to 0.6. Furthermore, the Cu2MgxZn1–xSn(S,Se)4thin films with large grain size, smooth surface and less grain boundaries was obtained at an optimized condition of x = 0.2. The carrier concentration of Cu2MgxZn1–xSn(S,Se)4thin film reaches the maximum 6.47 × 1018cm−3at x = 0.2, which is a potential material to be the absorption layer of high efficiency solar cells.
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