Crystallinity-dependent device characteristics of polycrystalline 2D n = 4 Ruddlesden-Popper perovskite photodetectors

Junwoo Kim, Woocheol Lee, Kyungjune Cho, Heebeom Ahn, Jonghoon Lee, Kyeong Yoon Baek, Jae Keun Kim, Keehoon Kang, Takhee Lee

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Ruddlesden-Popper (RP) perovskites have attracted a lot of attention as the active layer for optoelectronic devices due to their excellent photophysical properties and environmental stability. Especially, local structural properties of RP perovskites have shown to play important roles in determining the performance of optoelectronic devices. Here, we report the photodetector performance variation depending on the crystallinity of n = 4 two-dimensional (2D) RP perovskite polycrystalline films. Through controlling the solvent evaporation rate, 2D RP perovskite films could be tuned between highly- and randomly-orientated phases. We investigated how different factors related to the film crystallinity are reflected in the variation of photodetector performances by considering grain boundary and low energy edge state effects in n = 4 RP perovskites. Better understanding the interplay between these factors that govern the photophysical properties of the devices would be beneficial for designing high-performance RP perovskite-based optoelectronic devices.

Original languageEnglish
Article number003
Issue number18
Publication statusPublished - 2021 Apr 30

Bibliographical note

Funding Information:
The authors appreciate the financial support of the National Creative Research Laboratory program (Grant No. 2012026372) through the National Research Foundation of Korea (NRF) funded by the Korean Ministry of Science and ICT and the industry-university cooperation program by the Samsung Electronics Co., Ltd. KK appreciates the financial support by Postdoctoral Science Fellowship from POSCO TJ Park Foundation.

Publisher Copyright:
© 2021 IOP Publishing Ltd Printed in the UK

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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