The presence of redox reactions due to slow-moving ions at perovskite/contact interfaces is a major concern for the long-term stability of perovskite solar cells. In this work, we have evidently demonstrated the contribution of K+ ions on the removal of these non-capacitive effects that primarily accelerate the degradation mechanism in the devices. The intermittent current–voltage characteristics at the short-circuit conditions elucidate the role of K+ ions on reducing the rapid degradation at the interfaces due to the chemical reactivity of the accumulated ions by eliminating the burn-in decay in the photocurrent. Dark current–voltage measurements, time-resolved staircase voltammetry, and electrochemical impedance spectroscopy verified that both capacitive and non-capacitive currents, consequence of slow ion migration, are reduced by the incorporation of K+. Thus, this work signifies how K+ incorporation diminishes the internal degradation and enhances intrinsic stability of perovskite solar cells.
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7 August 2020
Research Article|
August 06 2020
Eradication of non-capacitive effects with potassium incorporation in perovskite solar cells
Special Collection:
Hybrid Organic-Inorganic Halide Perovskites
Vidya Raj
;
Vidya Raj
1
Centre for Research in Nanotechnology & Science, IIT Bombay
, Mumbai 400076, India
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Shaibal K. Sarkar
Shaibal K. Sarkar
a)
2
Department of Energy Science and Engineering, IIT Bombay
, Mumbai 400076, India
a)Author to whom correspondence should be addressed: shaibal.sarkar@iitb.ac.in
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a)Author to whom correspondence should be addressed: shaibal.sarkar@iitb.ac.in
Note: This paper is part of the special collection on Hybrid Organic-Inorganic Halide Perovskites.
J. Appl. Phys. 128, 055501 (2020)
Article history
Received:
March 24 2020
Accepted:
July 21 2020
Citation
Vidya Raj, Shaibal K. Sarkar; Eradication of non-capacitive effects with potassium incorporation in perovskite solar cells. J. Appl. Phys. 7 August 2020; 128 (5): 055501. https://doi.org/10.1063/5.0008736
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