Precision Strain Engineering in Perovskite Optoelectronics via Shock-Driven Gradient Annealing for Enhanced Stability...

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• High-performance perovskite optoelectronics depend on low defect density and efficient charge extraction.
• Residual tensile strain in perovskite films degrades charge mobility and increases recombination.
• Managing strain is crucial for optimizing perovskite film quality and device efficiency.

Purpose of the Study:

• To introduce and evaluate laser shock-driven gradient annealing (SDGA) for strain management and crystallization control in perovskite films.
• To investigate the impact of SDGA on perovskite structural uniformity, defect density, and optoelectronic properties.
• To demonstrate the potential of SDGA for fabricating highly efficient and stable perovskite-based optoelectronic devices.

Main Methods:

• Laser shock-driven gradient annealing (SDGA) using laser-induced plasma shocks for controlled annealing.
• Processing perovskite films in a semi-sealed environment to prevent evaporation and ensure consistent crystallization.
• Analysis of structural uniformity, lattice distortion, and energy band structure modulation.
• Fabrication and characterization of perovskite photodetectors.

Main Results:

• SDGA effectively releases residual strain and enhances structural uniformity in perovskite films.
• Plasma-induced pressure promotes solute diffusion and grain fusion, improving n-type semiconductor properties.
• SDGA-treated devices exhibit significantly higher responsivity (19.93 mA W⁻¹) and detectivity (7.21 × 10⁹ Jones) compared to thermal annealing.
• Photodetectors treated with SDGA retain 87% of their initial photocurrent after 30 days in air, demonstrating enhanced stability.

Conclusions:

• SDGA is a novel and effective method for strain management and crystallization control in perovskite films.
• This technique leads to improved structural quality, enhanced optoelectronic performance, and superior device stability.
• SDGA offers a transformative approach for developing robust and high-performance perovskite-based optoelectronic devices.