Low-Dimensional Perovskite Templated Growth of MAPbI3 Perovskite Crystals and Photovoltaic Performance of Solar Cells
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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