Perovskite Color Detectors: Approaching the Efficiency Limit

Mohammad Ismail Hossain, Haris Ahmad Khan, Masayuki Kozawa, Wayesh Qarony, Alberto Salleo, Jon Yngve Hardeberg, Hiroyuki Fujiwara, Yuen Hong Tsang, Dietmar Knipp

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Color image sensing by a smartphone or digital camera employs sensor elements with an array of color filters for capturing basic blue, green, and red color information. However, the normalized optical efficiency of such color filter-based sensor elements is limited to only one-third. Optical detectors based on perovskites are described, which can overcome this limitation. An efficient color sensor design has been proposed in this study that uses a vertically stacked arrangement of perovskite diodes. As compared to the conventional color filter-based sensors, the proposed sensor structure can potentially reach normalized optical efficiency approaching 100%. In addition, the proposed sensor design does not exhibit color aliasing or color Moiré effects, which is one of the main limitations for the filter-based sensors. Furthermore, up to our knowledge, for the first time, it could be theoretically shown that both vertically arranged sensor and conventional color filter-based sensor provide almost comparable color errors. The optical properties of the perovskite materials are determined by optical measurements in combination with an energy shift model. The optics of the stacked perovskite sensors is investigated by threedimensional finite-difference timedomain simulations. Finally, colorimetric characterization was carried out to determine the color error of the sensors.

Original languageEnglish
Pages (from-to)47831-47839
Number of pages9
JournalACS applied materials & interfaces
Volume12
Issue number42
DOIs
Publication statusPublished - 21 Oct 2020

Keywords

  • color science
  • color sensor
  • optical detector
  • perovskite
  • quantum efficiency

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