A high-precision, template-assisted, anisotropic wet etching method for fabricating perovskite microstructure arrays

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Cesium lead-halide perovskite microstructure arrays are crucial for laser applications due to their spectral properties.
• Existing fabrication methods struggle to achieve both tailored design and high resolution simultaneously.

Purpose of the Study:

• To introduce a high-precision fabrication method for perovskite microstructure arrays.
• To demonstrate the potential of these arrays in laser applications.

Main Methods:

• Developed a template-assisted, wet etching (TAWE) method for perovskite microstructure array fabrication.
• Fabricated a 20 × 20 inverted pyramid array with 3 μm diameter and 4 μm period.
• Filled the array with CsPbBr3 perovskite quantum dots via spin-coating and characterized lasing properties.

Main Results:

• Achieved ultrahigh accuracy with a resolution of 1 μm.
• Measured a low lasing threshold of 37.6 μJ cm⁻².
• Observed a narrow amplified spontaneous emission spectrum with a full width at half maximum of 4.7 nm.

Conclusions:

• The TAWE method allows for flexible design and controllable size of perovskite microstructure arrays.
• The fabricated arrays exhibit promising lasing characteristics, indicating potential for laser array applications.