Highly Photoluminescent and Environmentally Stable Perovskite Nanocrystals Templated in Thin Self-Assembled Block Copolymer Films

Hyowon Han, Beomjin Jeong, Tae Hyun Park, Wonhee Cha, Suk Man Cho, Yeongsik Kim, Hong Hee Kim, Dongho Kim, Do Yeol Ryu, Won Kook Choi, Cheolmin Park

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Ordered nanostructured crystals of thin organic–inorganic metal halide perovskites (OIHPs) are of great interest to researchers because of the dimensional-dependence of their photoelectronic properties for developing OIHPs with novel properties. Top-down routes such as nanoimprinting and electron beam lithography are extensively used for nanopatterning OIHPs, while bottom-up approaches are seldom used. Herein, developed is a simple and robust route, involving the controlled crystallization of the OIHPs templated with a self-assembled block copolymer (BCP), for fabricating nanopatterned OIHP films with various shapes and nanodomain sizes. When the precursor solution consisting of methylammonium lead halide (MAPbX3, X = Br, I) perovskite and poly(styrene)-block-poly(2-vinylpyridine) (PS-b-P2VP) is spin-coated on the substrate, a nanostructured BCP is developed by microphase separation. Spontaneous crystallization of the precursor ions preferentially coordinated with the P2VP domains yields ordered nanocrystals with various nanostructures (cylinders, lamellae, and cylindrical mesh) with controlled domain size (≈40–72 nm). The nanopatterned OIHPs show significantly enhanced photoluminescence (PL) with high resistance to both humidity and heat due to geometrically confining OIHPs in and passivation with the P2VP chains. The self-assembled OIHP films with high PL performance provide a facile control of color coordinates by color conversion layers in blue-emitting devices for cool-white emission.

Original languageEnglish
Article number1808193
JournalAdvanced Functional Materials
Volume29
Issue number26
DOIs
Publication statusPublished - 2019 Jun 27

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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