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Improved solution-processed Cu2ZnSnS4 solar cells using a temporary Ag layer

  • Kang Gu
  • Ruiting HaoEmail author
  • Jie GuoEmail author
  • Abuduwayiti AierkenEmail author
  • Xinxing Liu
  • Faran Chang
  • Yong Li
  • Guoshuai Wei
  • Bin Liu
  • Lu Wang
  • Shuaihui Sun
  • Xiaole Ma
Article
  • 36 Downloads

Abstract

A 25 nm thick Ag thin film was sputtered between the Cu2ZnSnS4 (CZTS) absorber and Mo electrode to improve the back contact in CZTS solar cells. The CZTS absorber was fabricated via a cost-effective N,N-dimethylformamide-based solution method. X-ray diffraction and Raman spectroscopy demonstrated that Ag diffused into the CZTS and partially substituted Cu, which resulted in an increased lattice constant a and grain size. Ag doping of CZTS (ACZTS) reduced both the Sn-loss and the presence of voids. An ACZTS photovoltaic device (ITO/i-ZnO/CdS/ACZTS/Mo) was fabricated and showed higher EQE than the CZTS device over the wavelength range of 450–800 nm. The open circuit voltage increased (Voc) from 543 to 631 mV, the short circuit current density (Jsc) increased from 10.36 to 14.37 mA, and the efficiency increased from 2.02 to 3.43% after sputtering the Ag layer. This is mainly because Ag functions as a temporary protective layer that made a tighter combination between Mo and the CZTS absorber.

Notes

Acknowledgements

This study was supported by the National Natural Science Foundation of China (Nos. 61774130, 11474248, 61176127, 61006085, 61534008), the Key Program for International S&T cooperation Projects of China (No. 2011DFA62380), and the Ph.D. Programs Foundation of Ministry of Education of China (No. 20105303120002).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • Kang Gu
    • 1
  • Ruiting Hao
    • 1
    • 2
    Email author
  • Jie Guo
    • 1
    • 2
    Email author
  • Abuduwayiti Aierken
    • 1
    Email author
  • Xinxing Liu
    • 1
  • Faran Chang
    • 1
  • Yong Li
    • 1
  • Guoshuai Wei
    • 2
  • Bin Liu
    • 2
  • Lu Wang
    • 2
  • Shuaihui Sun
    • 2
  • Xiaole Ma
    • 2
  1. 1.School of Energy and Environment Science, Key Laboratory of Renewable Energy Advanced Materials and Manufacturing Technology Ministry of EducationYunnan Normal UniversityKunmingPeople’s Republic of China
  2. 2.Yunnan Key Lab of Opto-electronic Information TechnologyYunnan Normal UniversityKunmingPeople’s Republic of China

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