Kim, Geemin An, Sol Hyeong, Seok-Ki Lee, Seoung-Ki Kim, Myungwoong Shin, Naechul 2024-01-19T19:02:30Z 2024-01-19T19:02:30Z 2021-09-05 2019-10-08 0897-4756 https://pubs.kist.re.kr/handle/201004/119462 Thin film fabrication is necessary to realize the device integration of organic-inorganic hybrid perovskites (OIHPs), and solution-based crystallization methods have been employed widely to this end. Despite the versatility of the solution approach, device fabrication using typical "topdown" lithography is generally incompatible with as-prepared OIHPs films because of the low stability of perovskites to polar solvents involved in the lithographic process. Moreover, solution-prepared perovskites usually exhibit irregular surface roughness, implying the existence of randomly oriented crystal domains with a large density of grain boundaries, which are ultimately detrimental to the material properties. Here, we report a patterning of CH3NH3PbI3 (MAPbI(3)) thin films using a photolithographically fabricated cross-linked copolymer template on Si or SiO2 substrates via a chemical vapor deposition (CVD) method. Perovskite patterning is accomplished by growing PbI, precursor layers selectively on template patterns and subsequently converting to MAPbI(3) using CH3NH3I (MAI) in the vapor phase. We confirm that [0001]-oriented PbI2 nanoplatelets nucleate primarily on a Si or SiO2 surface and grow by surface diffusion from a polymer surface. The MAPbI(3) conversion process preserves the original pattern morphology through the vapor-solid intercalation of MAI. Prototype photodetector arrays based on MAPbI(3) patterns are also demonstrated. Our results highlight the advantages of the CVD patterning of perovskite materials in large-scale production for a range of optoelectronic applications. English AMER CHEMICAL SOC HYBRID PEROVSKITE SOLAR-CELLS THIN-FILMS CONVERSION PBI2 NANOWIRES GROWTH RANGE Perovskite Pattern Formation by Chemical Vapor Deposition Using Photolithographically Defined Templates Article 10.1021/acs.chemmater.9b03155 1 CHEMISTRY OF MATERIALS, v.31, no.19, pp.8212 - 8221 CHEMISTRY OF MATERIALS 31 19 8212 8221 scie scopus 000489678800044 2-s2.0-85073418275 Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science Article HYBRID PEROVSKITE SOLAR-CELLS THIN-FILMS CONVERSION PBI2 NANOWIRES GROWTH RANGE