Vapor-phase deposition of organic-inorganic hybrid perovskite thin films

초록

Organic-inorganic hybrid perovskites (OIHPs) composed of organic cations, divalent metals, and halides have outstanding optoelectronic properties, including widely tunable bandgaps and low bulk recombination rate, making them ideal candidates for photovoltaic and light emitting devices. While the solution-based process has been universally employed to fabricate OIHP thin films, vapor deposition is beneficial in the conformality of the deposited layers, absence of solvents, and upscalable process design for the industrial level. This talk addresses our recent effort in the development of vapor-phase deposition of OIHP thin films. The deposition process consists of the consecutive evaporation of lead iodide (PbI2) and methylammonium iodide (CH3NH3I), enabling conformal deposition of methylammonium lead iodide (CH3NH3PbI3) layers. The advantages of our vapor-processing are demonstrated by 1) pattern formation using templated layer growth, 2) bandgap tuning via in situ halide exchange, and 3) stability enhancement through vapor-based passivation. Our results emphasize the importance of vapor-based deposition in the scalable production of OIHP thin films for various optoelectronic devices.