High Performance of Cs₂AgBiBr₆ Perovskite-based Photodetectors by Adding DEAC

Area of Science:

• Materials Science
• Optoelectronics
• Chemical Engineering

Background:

• Perovskite photodetectors (PDs) offer great potential in various applications but face challenges due to toxicity and instability.
• Lead-free double perovskite Cs2AgBiBr6 is a promising alternative, but its fabrication via electrophoretic deposition (EPD) often results in compromised film quality.

Purpose of the Study:

• To enhance the quality and performance of lead-free Cs2AgBiBr6 perovskite films for photodetector applications.
• To investigate the effect of incorporating N-acetylethylenediamine (DEAC) ligand during EPD on Cs2AgBiBr6 film crystallization and optoelectronic properties.

Main Methods:

• Fabrication of Cs2AgBiBr6 perovskite films using electrophoretic deposition (EPD) with the addition of N-acetylethylenediamine (DEAC) to the precursor solution.
• Characterization of the film quality, stability, and optoelectronic performance of the fabricated photodetectors.
• Evaluation of the performance and stability of flexible photodetectors fabricated on the improved Cs2AgBiBr6 films.

Main Results:

• The addition of DEAC ligand to the Cs2AgBiBr6 precursor significantly improved film quality and crystallization during EPD.
• Optimized photodetectors achieved high detectivity (up to 4.4×10^12 Jones) and excellent air stability.
• Flexible Cs2AgBiBr6 perovskite photodetectors demonstrated high detectivity (up to 3.2×10^12 Jones) and robust bending cycle stability.

Conclusions:

• Incorporating ligands like DEAC during EPD is a feasible strategy to improve the crystallization of double perovskite thin films.
• This approach leads to enhanced optoelectronic performance and stability in perovskite photodetectors.
• The method shows potential for application in other halide perovskites, offering a pathway to high-quality, stable optoelectronic devices.