Destructive Reverse Bias Pinning in Perovskite/Silicon Tandem Solar Modules Caused by Perovskite Hysteresis under Dynamic Shading

Jiadong Qian, Marco Ernst, Daniel Walter, Md Mahmud, Peter Hacke, Klaus Weber, Mowafak Al-Jassim, Andrew Blakers

Research output: Contribution to journalArticlepeer-review

17 Scopus Citations

Abstract

We demonstrate how perovskite hysteresis can result in permanent reductions in power output in perovskite/silicon tandem modules - including irreversible hotspot-induced damage - from only brief periods of shading. We show that reverse bias events in which a perovskite cell is biased above a threshold voltage - which in this work we find to be as low as -1.1 V - produces a temporary reduction in power output that is of sufficient magnitude to keep the cell pinned in reverse bias after the shading event ends. As a hysteretic phenomena, this crucial failure mode may be overlooked by static models of perovskite-based solar cells. Higher reverse bias voltages exacerbate the temporary reduction in short-circuit photocurrent, which is also sensitive to the level of illumination under reverse bias. Numerical device modelling demonstrates that this effect is consistent with our understanding of perovskite hysteresis as a consequence of mobile ion-electron coupling controlling rates of non-radiative recombination over time. Measurements of the dynamic response of single-junction perovskite cells are extrapolated to two-terminal and four-terminal perovskite/silicon tandem module modelling. We validate these models with measurements from an equivalent electronic circuit that represents a two-terminal perovskite-silicon tandem mini module. Two module-level solutions are discussed that address this issue, which includes increasing the number of bypass diodes and choosing better suited silicon bottom cells with higher shunter resistance in two-terminal tandem modules.

Original languageAmerican English
Pages (from-to)4067-4075
Number of pages9
JournalSustainable Energy and Fuels
Volume4
Issue number8
DOIs
StatePublished - Aug 2020

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry.

NREL Publication Number

  • NREL/JA-5K00-75679

Keywords

  • perovskite
  • shading
  • silicon tandem

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