Oh, Heeyoon Kim, Hae Jin Kim, Soyoung Kim, Jin A. Kang, Gumin Park, Minwoo 2024-01-19T15:02:53Z 2024-01-19T15:02:53Z 2021-09-05 2021-04 0169-4332 https://pubs.kist.re.kr/handle/201004/117196 Organic-inorganic halide perovskites are considered as a core material in optoelectronics. Particularly, perovskite-based photodetectors are promising devices for sensing and imaging applications. Their two-terminal structure provides advantages in terms of fabrication, mechanical flexibility, and reproducibility. However, due to their low responsivity, they require high driving voltages (>5 V). Here, we propose a simple procedure for the design of high-performance, low-power, and flexible perovskite photodetectors by employing an assembled polymeric micmbead monolayer. A large-area photonic crystal comprising transfer-printed polystyrene (PS) beads on poly(methylmethacrylate) (PMMA)/perovskite layers confines the electromagnetic field in perovskite. The significant increase in the photoluminescence characteristics of pemvskite improves the responsivity, detectivity, and noise equivalent power to over 8.5 times. The polarization-insensitive light absorption of perovskite by the PS bead layer promotes excellent omnidirectionality with respect to the incident light at different angles. Furthermore, the mechanical durability of the flexible devices at a submillimeter bending radius (0.2 mm) is significantly improved by employing PMMA/PS layers. The resulting device performance exhibits excellent retention of 81.5% after 20 bending cycles. The proposed approach in the design of versatile micro-optical structures on perovskite paves the way in realizing highly deformable and efficient perovskite-based optoelectmnics. English ELSEVIER Highly flexible and stable perovskite/microbead hybrid photodetectors with improved interfacial light trapping Article 10.1016/j.apsusc.2020.148850 1 APPLIED SURFACE SCIENCE, v.544 APPLIED SURFACE SCIENCE 544 N scie scopus 000618288000003 2-s2.0-85099183403 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article Perovskite/microbead hybrid Flexible photodetector Transfer printing Light trapping Microbead array