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Abstract
n-i-p Type perovskite solar cells generally require air oxidation of the Spiro-OMeTAD layer to achieve high power conversion efficiency (PCE). However, the detailed oxidation mechanism is still not fully understood. In this paper, oxidation of Spiro-OMeTAD was demonstratedviaa non-contact electrochemical route using UV-Vis absorption, laser beam induced current (LBIC) imaging and secondary ion mass spectrometry (SIMS) profiling of the Spiro-OMeTAD films. At the cathode, oxygen is reduced to form OH−with the help of H2O, while the anodic reaction is the oxidation of Spiro-OMeTAD to form Spiro-OMeTAD+. Diffusion of Li+towards the surface of the Ag electrode completes the electrochemical cycle and increases the conductivity of the hole-transporting layer. SIMS analyses of the completed devices demonstrate that the oxidation of Spiro-OMeTAD also leads to migration of Li+through the perovskite layer into SnO2, which supposedly leads to an increase of the built-in voltage. We verify these results by incorporation of the experimentally measured Li+concentration into a numerical drift-diffusion simulation, to replicate solar cellJ-V-curves. This work provides a new insight into the oxidation of Spiro-OMeTAD in perovskite solar cells, and demonstrates that Li+migration is involved in the oxidation of Spiro-OMeTAD.
Original language | English |
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Pages (from-to) | 7575-7585 |
Number of pages | 11 |
Journal | Journal of Materials Chemistry A |
Volume | 9 |
Issue number | 12 |
DOIs | |
Publication status | Published - 28 Mar 2021 |
MoE publication type | A1 Journal article-refereed |
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Dive into the research topics of 'Synergetic effects of electrochemical oxidation of Spiro-OMeTAD and Li+ ion migration for improving the performance of n-i-p type perovskite solar cells'. Together they form a unique fingerprint.Projects
- 1 Finished
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ASPIRE: A novel sandwich preparation method for highly reproducible and stable perovskite solar cells
Österbacka, R., Smått, J., Vivo, P. & Lund, P. D.
01/01/18 → 31/12/21
Project: Foundation
Activities
- 1 Visiting an external academic institution
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Printable Electronics Research Center at the Suzhou Institute for Nano Sciences (SINANO)
Ronald Österbacka (Visiting researcher)
1 Jan 2020 → 31 Aug 2023Activity: Visiting an external institution › Visiting an external academic institution