Nanopatterning on Mixed Halide Perovskites for Promoting Photocurrent Generation of Flexible Photodetector

Do Hyung Chun, Seongchan Kim, Jumi Park, Sun Je Lee, Wook Kim, Jung Hwan Lee, Ryan Rhee, Tae Gyun Kim, Dae Geun Choi, Dukhyun Choi, Dongho Kim, Jeong Ho Cho, Jong Hyeok Park

Research output: Contribution to journalArticlepeer-review


Nanoimprinting lithography (NIL) technique is widely utilized for nanostructure engineering of soft materials. Owing to the soft organic/inorganic hybrid nature, the optical and crystallographic properties of halide perovskites (HPs) are improved by the NIL process. However, the wide application of NIL into various HPs has lagged. Herein, a defect-free nanopatterned-(FAPbI3)0.85(MAPbBr3)0.15 (NP-FAMA) film is successfully developed via optimized NIL. As surface energy is a key parameter to be controlled for accomplishing NIL process, trichloro(1H,1H,2H,2H-perfluorooctyl)silane (CF3(CF2)5CH2CH2SiCl3) treatment on polymeric mold, which prevents the peeling-off problem. Along with surface morphology modification, NP-FAMA exhibits enhanced crystallographic and photophysical properties. The photoresponsivity of NP-FAMA-based photodetectors outperforms bare (b-) FAMA-based devices. Surprisingly, the external quantum efficiency (EQE) of the NP-FAMA-based devices dramatically increases to 225%, photomultiplication (PM), under 1 nW illumination without any charge-injecting materials. To clarify these PM phenomena, the trap-assisted PM mechanism is suggested as a model system for promoting photocurrent generation of HPs that is supported by PL analysis.

Original languageEnglish
Article number2206995
JournalAdvanced Functional Materials
Issue number43
Publication statusPublished - 2022 Oct 21

Bibliographical note

Funding Information:
D.H.C., S.K., and J.P. contributed equally to this work. J.H.P. acknowledges the support from the International Energy Joint R&D Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea. (20208510010310) and NRF Korea (NRF‐2019R1A2C3010479, 2022‐H1D3A3A01077254 (BrainLink Program)). J.H.C. was supported by the Materials & Components Technology Development Program (20006537, Development of High‐Performance Insulation Materials for Flexible OLED Display TFT) funded By the Ministry of Trade, Industry & Energy (MOTIE, Korea).

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

All Science Journal Classification (ASJC) codes

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


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