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Controlled oxidation of Ni for stress-free hole transport layer of large-scale perovskite solar cells

  • Seongha Lee
  • Hee-Suk Roh
  • Gill Sang HanEmail author
  • Jung-Kun LeeEmail author
Research Article
  • 41 Downloads

Abstract

The effect of the residual thermal stress of NiO films on the performance of an inverted type perovskite solar cell was studied. In this study, NiO films were grown on fluorine doped tin oxide (FTO) substrates of different surface roughness by thermally oxidizing Ni film and were tested as a hole transport layer for large-scale perovskite solar cells. Experimental and simulation results show that it is very important to suppress the appearance of the residual stress at the NiO-FTO interface during the oxidation of the Ni film for effective hole extraction. The Ni oxidation on the flat FTO film produced in-plane compressive stress in the NiO film due to the Ni film volume expansion. This led to the formation of defects including small blisters. These residual stress and defects increased leakage current through the NiO film, preventing holes from being selectively collected at the NiO-perovskite interface. However, when Ni was deposited and oxidized on the rough surface, the residual stress of the NiO film was negligible and its inherent high resistance was maintained. Stress-free NiO film is an excellent hole transport layer that stops the photogenerated electrons of the perovskite layer from moving to FTO. The improvements in the structural and electrical qualities of the NiO film by engineering the residual stress reduce the carrier recombination and increase the power conversion efficiency of the perovskite solar cells to 16.37%.

Keywords

nickel oxidation surface roughness residual stress perovskite solar cells large scale processing 

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Notes

Acknowledgements

This work was supported from the Global Frontier R&D Program on Center for Multiscale Energy System, Republic of Korea (No. 2012M3A6A7054855) and National Science Foundation (NSF 1709307).

Supplementary material

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Controlled oxidation of Ni for stress-free hole transport layer of large-scale perovskite solar cells

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Copyright information

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Mechanical Engineering and Materials ScienceUniversity of PittsburghPennsylvaniaUSA
  2. 2.School of Advanced Materials Science and EngineeringSungkyunkwan UniversitySuwonRepublic of Korea

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