Influence of alkali metals (Na, Li, Rb) on the performance of electrostatic spray-assisted vapor deposited Cu2ZnSn(S,Se)4 solar cells.
Influence of alkali metals (Na, Li, Rb) on the performance of electrostatic spray-assisted vapor deposited Cu2ZnSn(S,Se)4 solar cells.
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DOI：
10.1038/srep22109
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发表时间：
2016-02-26
影响因子：
4.6
通讯作者：
Choy KL
中科院分区：
文献类型：
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作者：
Altamura G;Wang M;Choy KL
静电喷雾辅助气相沉积(ESAVD)是一种非真空、低成本的大规模沉积金属氧化物、各种硫化物和硫化物的方法。在本工作中，我们使用ESAVD法沉积了Cu2ZSnxSex(S1−xSex)4(CZTSSe)吸收体。在CZTSSe化合物中加入不同的碱金属Na、Li和Rb，以进一步提高相关器件的光伏性能。此外，据我们所知，还没有进行实验研究来测试Li和Rb在CZTSSe太阳能电池中的作用。用X射线衍射仪、拉曼光谱、扫描电子显微镜和辉光放电光谱对沉积的CZTSSe薄膜的相纯度、形貌和成分进行了表征。通过完成如下太阳能电池来确定所得到的器件的光伏性能：Mo/CZTSSe/CDS/I-ZnO/Al：ZnO/Ni/Al。结果表明，Li、Na、Rb掺杂可使CZTS器件的功率转换效率提高5.5%。引入硫脲处理，改善了吸收体-缓冲器界面的质量，将器件效率推高至6.3%，这是目前报道的ESAVD沉积CZTSSe太阳电池的最佳结果。
Electrostatic Spray-Assisted Vapor Deposition (ESAVD) is a non-vacuum and cost-effective method to deposit metal oxide, various sulphide and chalcogenide at large scale. In this work, ESAVD was used to deposit Cu2ZnSn(S1−xSex)4 (CZTSSe) absorber. Different alkali metals like Na, Li and Rb were incorporated in CZTSSe compounds to further improve the photovoltaic performances of related devices. In addition, to the best of our knowledge, no experimental study has been carried out to test the effect of Li and Rb incorporation in CZTSSe solar cells. X-ray diffraction, Raman spectroscopy, scanning electron microscopy, and glow discharge spectroscopy have been used to characterize the phase purity, morphology and composition of as-deposited CZTSSe thin films. Photovoltaic properties of the resulting devices were determined by completing the solar cells as follows: Mo/CZTSSe/CdS/i-ZnO/Al:ZnO/Ni/Al. The results showed that Li, Na and Rb incorporation can increase power conversion efficiency of CZTS devices up to 5.5%. The introduction of a thiourea treatment, has improved the quality of the absorber|buffer interface, pushed the device efficiency up to 6.3% which is at the moment the best reported result for ESAVD deposited CZTSSe solar cells.