Innovative and industrially viable approach to fabricate AlOx rear passivated ultra-thin Cu(In, Ga)Se2 (CIGS) solar cells

•Novel and industrially relevant rear surface passivation approach for CIGS ultra-thin solar cells.•Atomic-layer-deposited Al2O3 is used as a passivation layer.•Spin-coated alkali solution is used to create point contacts.•Top-view SEM image of point contacts and supportive EDS analysis is presented...

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