![]() The ultrathin flexible SCM exhibits ultralow defect density, superior uniformity and long-term stability. Herein we report a method of induced peripheral crystallization to prepare large area flexible single-crystalline membrane (SCM) of phenylethylamine lead iodide (C 6H 5C 2H 4NH 3) 2PbI 4 with area exceeding 2500 mm 2 and thinness as little as 0.6 μm. As such, it is impossible to design highly demanded flexible single-crystalline electronics and wearable devices including displays, touch sensing devices, transistors, etc. Unfortunately, all single crystalline perovskites attained so far are limited to bulk single crystals and small area wafers. Single crystalline perovskites exhibit high optical absorption, long carrier lifetime, large carrier mobility, low trap-state-density and high defect tolerance.
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