An experimental and first-principles study on band alignments at interfaces of Cu2ZnSnS4/CdS/ZnO heterojunctions

An experimental and first-principles study on band alignments at interfaces of Cu2ZnSnS4/CdS/ZnO heterojunctions
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Cu2ZnSnS4/CdS/ZnO 异质结界面能带排列的实验和第一性原理研究

DOI:
10.1088/0022-3727/47/7/075304
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发表时间:
2014-02
期刊:
Journal of Physics D: Applied Physics
影响因子:
--
通讯作者:
Liu Lei
Liu Lei
中科院分区:
其他
文献类型:
--
作者:
Deng Rui;Fang Xuan;Wei Zhi-Peng;Liu Lei

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采用X射线光电子能谱(XPS)、光吸收谱(OAS)和第一性原理计算研究了典型CZTS/CdS/ZnO异质结太阳电池中Cu 2 ZnSnS 4(CZTS)/CdS和CdS/ZnO界面的能带偏移。X射线光电子能谱和光吸收谱的测量表明,在CZTS/CdS和CdS/ZnO界面的导带偏移显示II型对齐的值分别为0.13 eV和1.00 eV,这是很好地支持基于混合泛函方法的第一性原理计算。我们的研究结果表明,虽然CZTS/CdS异质结的II型排列可以形成较少的跨界面的电子传输的障碍,“界面带隙”的缩小增加了载流子的复合。
We investigated band offsets at Cu2ZnSnS4(CZTS)/CdS and CdS/ZnO interfaces in a typical CZTS/CdS/ZnO heterojunction solar cell by combining x-ray photoelectron spectroscopy and optical absorption spectroscopy as well as first-principles calculations. X-ray photoelectron spectroscopy and optical absorption spectroscopy measurements indicate that the conduction-band offsets at both CZTS/CdS and CdS/ZnO interfaces show type-II alignment with values of 0.13 eV and 1.00 eV, respectively, which are well supported by first-principles calculations based on the hybrid functional method. Our results suggest that, although type-II alignment for CZTS/CdS heterojunction can form less of a barrier to electron transport across the interfaces, the narrowing of the ‘interface bandgap’ increases recombination of carriers.
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