Patterning Halide Perovskite Monocrystalline Arrays via Dry Imprinting Transfer

Area of Science:

• Materials Science
• Optoelectronics
• Semiconductor Devices

Background:

• Perovskite single crystals (SCs) offer high performance but face challenges in large-scale patterning due to material degradation and contamination.
• Existing patterning methods limit the development of perovskite SC arrays and pixelization.

Purpose of the Study:

• To develop a damage- and residue-free dry patterning method for perovskite single crystals (SCs).
• To enable the fabrication of large-scale perovskite SC arrays and integrated optoelectronic devices.

Main Methods:

• Utilizing a rigid stamper to mechanically punch freestanding perovskite films into SC arrays.
• Employing van der Waals (vdW) lamination for integrating complex configurations and heterostructures.

Main Results:

• Achieved high-uniformity, dry patterning of perovskite SCs preserving intrinsic properties.
• Fabricated 3x3 photodetector arrays with consistent responsivity (0.5-2.6 A/W), detectivity (0.3-4 × 10^11 Jones), and fast response (<20 ms).
• Demonstrated integration of full-color pixels and vertical heterostructures.

Conclusions:

• The developed dry imprinting transfer approach provides a simple, rapid method for patterning perovskite SC arrays.
• This technique is crucial for high-performance photodetectors and optoelectronics.
• Shows potential for integrating delicate semiconductors like organic thin films and 2D magnetic crystals into vdW heterostructures.