Perovskite solar cells with 18.21% efficiency and area over 1 cm2 fabricated by heterojunction engineering

The performance of inverted perovskite solar cells has so far lagged behind that of their normal-structure counterparts. Wu et al. fabricate an inverted perovskite–fullerene solar cell with a graded heterojunction that achieves a certified efficiency of over 18% for a cell area of 1 cm2.

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