Perovskites have stimulated the interest of scientists and engineers who are eager to study and rationalize its fascinating photochemical properties. Their findings resulted in the development of solar cells, photodetectors, and light emitting diodes among many other devices. Compared to other materials, perovskite exhibits long carrier lifetime, long carrier diffusion length and high carrier mobility upon exposure to light.<br/>     Recent progress in patterning perovskite materials involve the use of templates, such as packed microspheres, and porous membranes, which brought about solar cells with better efficiencies and photodetector arrays used for imaging. Other groups employed stamps or molds to imprint the pattern as the perovskite crystallizes out of the precursor solution. A more direct approach was also adapted by some groups by using a laser or focused-ion beam to generate patterns either by evaporating the precursor solvent or by etching. Another approach, which is the focus of this research, is too deposit or grow perovskite films or crystals on a chemically patterned surface. While other groups used structurally patterned substrate to control the adsorption of the precursor, our group used a flat substrate with chemically patterned wettability to spatially control the adsorption of the perovskite precursor solution.<br/>     Under the right experimental conditions, we show that it is feasible to fabricate patterned perovskite thin films and grow an array of single perovskite microcrystals on a chemically patterned surface generated through a simple two step photoinitiated thiol-ene coupling reactions on a vinyl-functionalized substrate. These patterned perovskite films and microcrystal arrays can be developed into LED or photodetector arrays.

Patterned perovskite thin film and single microcrystal arrays on a chemically patterned flat substrate

2019 Spring National Meeting

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