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<p> Halide perovskite solar cells (PSCs) were introduced in 2009, with demonstrated efficiencies just below 4% [ <xref ref-type="bibr" rid="jpenergyacc892bib1">1</xref> ]. Since then, PSC efficiencies have grown rapidly, reaching over 25% for single junction cells [ <xref ref-type="bibr" rid="jpenergyacc892bib2">2</xref> ], and over 30% for tandem perovskite-on-silicon devices [ <xref ref-type="bibr" rid="jpenergyacc892bib3">3</xref> , <xref ref-type="bibr" rid="jpenergyacc892bib4">4</xref> ]. Scalability potential towards PSC modules has been demonstrated, with pilot outdoor small scale photovoltaic (PV) systems already being made [ <xref ref-type="bibr" rid="jpenergyacc892bib5">5</xref> , <xref ref-type="bibr" rid="jpenergyacc892bib6">6</xref> ]. Past experience based on organic PV device stability testing protocols has accelerated the understanding of degradation and stability towards more stable PSC devices [ <xref ref-type="bibr" rid="jpenergyacc892bib7">7</xref> , <xref ref-type="bibr" rid="jpenergyacc892bib8">8</xref> ]. </p>