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High-Resolution Spin-on-Patterning of Perovskite Thin Films for a Multiplexed Image Sensor Array.

Woongchan Lee1,2, Jongha Lee1,2, Huiwon Yun1,2

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Summary

A new spin-on-patterning process enables high-definition patterning of unstable perovskite thin films. This breakthrough facilitates the development of advanced, ultrathin, and flexible perovskite-on-silicon image sensors.

Keywords:
dewettinghigh-resolution patterningperovskite patterningperovskite photodiode

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Inorganic-organic hybrid perovskite thin films offer excellent optoelectronic properties for photon-absorbing devices, presenting an alternative to silicon.
  • High-definition patterning of these perovskite films is crucial for image sensor fabrication but challenging due to their instability in photolithographic solvents.

Purpose of the Study:

  • To develop a novel, high-resolution patterning process for perovskite thin films compatible with their inherent instability.
  • To demonstrate the application of this new process in creating advanced image sensor arrays.

Main Methods:

  • Introduction of a high-resolution spin-on-patterning (SoP) process.
  • Compatibility testing of the SoP process with various spin-coated perovskite materials and deposition techniques.

Main Results:

  • The SoP process successfully achieved high-definition patterning of perovskite thin films.
  • The process is fast, facile, and compatible with diverse perovskite materials and deposition methods.
  • Development of a high-performance, ultrathin, and deformable perovskite-on-silicon multiplexed image sensor array using the SoP process.

Conclusions:

  • The novel SoP process overcomes the limitations of traditional photolithography for perovskite thin films.
  • This technique enables the fabrication of next-generation image sensor arrays with enhanced performance, flexibility, and reduced thickness.