Jeong, Beomjin Han, Hyowon Kim, Hong Hee Choi, Won Kook Park, Youn Jung Park, Cheolmin 2024-01-19T18:04:12Z 2024-01-19T18:04:12Z 2021-09-05 2020-02 1936-0851 https://pubs.kist.re.kr/handle/201004/118997 Despite the great interest in inorganic halide perovskites (IHPs) for a variety of photoelectronic applications, environmentally robust nanopatterns of IHPs have hardly been developed mainly owing to the uncontrollable rapid crystallization or temperature and humidity sensitive polymorphs. Herein, we present a facile route for fabricating environment-and phase-stable IHP nanopatterns over large areas. Our method is based on nanoimprinting of a soft and moldable IHP adduct. A small amount of poly(ethylene oxide) was added to an IHP precursor solution to fabricate a spin-coated film that is soft and moldable in an amorphous adduct state. Subsequently, a topographically prepatterned elastomeric mold was used to nanoimprint the film to develop well-defined IHP nanopatterns of CsPbBr3 and CsPbI3 of 200 nm in width over a large area. To ensure environment- and phase-stable black CsPbI3 nanopatterns, a polymer backfilling process was employed on a nanopatterned CsPbI3. The CsPbI3 nanopatterns were overcoated with a thin poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) film, followed by thermal melting of PVDF-TrFE, which formed the air-exposed CsPbI3 nanopatterns laterally confined with PVDF-TrFE. Our polymer backfilled CsPbI3 nanopatterns exhibited excellent environmental stability over one year at ambient conditions and for 10 h at 85 degrees C, allowing the development of arrays of two-terminal, parallel-type photodetectors with nanopatterned photoactive CsPbI3 channels. Our polymer-assisted nanoimprinting offers a fast, low-pressure/temperature patterning method for high-quality nanopatterns on various substrates over a large area, overcoming conventional costly time-consuming lithographic techniques. English AMER CHEMICAL SOC FULL-COLOR THIN-FILMS LARGE-AREA LEAD PHOTODETECTOR EFFICIENCY STABILITY EMISSION Polymer-Assisted Nanoimprinting for Environment- and Phase-Stable Perovskite Nanopatterns Article 10.1021/acsnano.9b06980 1 ACS NANO, v.14, no.2, pp.1645 - 1655 ACS NANO 14 2 1645 1655 scie scopus 000518024700036 2-s2.0-85081177439 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article FULL-COLOR THIN-FILMS LARGE-AREA LEAD PHOTODETECTOR EFFICIENCY STABILITY EMISSION nanopatterns CsPbI3 perovskite phase stabilization poly(ethylene oxide) nanoimprinting photodetectors