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Patterning RGB Perovskite Pixels via Sequential Vapor-Solution Process for Integrated Wavelength-Selective

Yunmo Kang1, Won Chang Choi1, Phung Dinh Hoat1,2

  • 1School of Materials Science and Engineering, Kyungpook National University, Daegu, 41566, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|March 25, 2026
PubMed
Summary
This summary is machine-generated.

A novel hybrid patterning method precisely creates multi-wavelength perovskite pixel arrays for advanced optoelectronics. This technique avoids damage and contamination, enabling high-performance color imaging and photodetectors.

Keywords:
RGB‐selective photodetectorshalide perovskite patterningmulti‐compositional arrayspixelated perovskite arrayssequential vapor–solution process

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Patterning multi-wavelength pixel arrays is challenging due to solvent-based method limitations like degradation and contamination.
  • Halide perovskites offer potential for next-generation optoelectronics due to their optical and electronic properties, but require precise patterning.

Purpose of the Study:

  • To develop a precise, damage-free patterning strategy for halide perovskite pixel arrays.
  • To enable tunable bandgaps for multi-wavelength optoelectronic applications.

Main Methods:

  • A two-step hybrid patterning strategy combining vapor-deposited lead halides (PbX2) with solution-processed methylammonium halides (MAX).
  • Fabrication of RGB perovskite pixel arrays with controlled bandgaps (1.77–2.48 eV).

Main Results:

  • Achieved precise control over MAPbX3 bandgaps without structural damage or contamination.
  • Produced RGB perovskite pixel arrays with sharp edges, uniform thickness (~220 nm), and high crystallinity.
  • Demonstrated wavelength-selective photodetectors (PDs) with peak external quantum efficiencies of 65% (658 nm), 61% (520 nm), and 50% (450 nm).
  • Successfully performed direct RGB imaging with a 5x5 image sensor array, validating intrinsic pixel wavelength selectivity.

Conclusions:

  • The scalable hybrid patterning strategy enables precise fabrication of multi-wavelength perovskite pixel arrays.
  • This versatile platform supports advanced optoelectronic applications, including color-resolved PDs, integrated image sensors, and neuromorphic vision systems.