Due to low costs and exceptional photoelectric properties,perovskite solar cell materials have attracted great attention.During the fabrication of perovskite light-absorbing layers,dual-source vapor-deposited perovskite thin films suffer from long-standing issues of unknown growth mechanism and inferior crystallization quality,which negatively impacts the optical absorbance and charge carrier lifetimes of perovskite thin films,impeding the performance development of vapor-deposited perovskite solar cell devices.By utilizing bulky organic cations with different radii,this work designs quasi two-dimensional perovskite materials,and apply them as buffering templates at the perovskite/hole transport layer interfaces,thus manipulating the crystal growth process of vapor-deposited perovskite grains.The modified crystallization patterns result in vertically grown perovskite grains with columnar shapes,which notably enhances light-absorbing properties and carrier lifetimes of perovskite layers,boosting the power conversion efficiency from 16.21％to 19.55％on perovskite solar cells.The abovementioned results have provided valuable references to the vapor-deposited perovskite films and photovoltaic devices with outstanding optoelectronic performance.
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