Journal Article buried interface inverted perovskite solar cells CsPbI3 perovskite solar cells NiOx hole transport layer (HTL) ambient printed devices crystal growth crystallization defects passivation holistic passivation strategy integrated NiOx‐SAMs HTL lattice strain low-light photovoltaic cells low-power-consumption electronic devices micrometer-thick perovskite films perovskite solar cell perovskite solar cells self‐assembled molecules (SAMs) self‐assembled monolayer stress relief surface energy