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The lattice strain of a perovskite film is vital to the controllable growth and charge transport in perovskite solar cells (PSCs). In this work, a lead chloride (PbCl2) assisted crystallization (LCAC) protocol is introduced for releasing the strain across the interface of a NiOx/perovskite, which induces a preferred (h0 crystal plane growth and grain homogenization. PSCs with LCAC show a facilitated charge extraction and suppressed nonradiative recombination. Thanks to the controlled film growth and strain-released interface, the inve