Additive Modulated Perovskite Microstructures for High Performance Photodetectors

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Organic-inorganic hybrid perovskites offer excellent optoelectronic properties for photodetectors.
• Crystallographic defects in perovskites lead to high dark current, limiting device performance.

Purpose of the Study:

• To develop a method for controlling microstructure in methylammonium lead iodide (MAPbI3) perovskites.
• To improve the performance of perovskite photodetectors by reducing dark current and enhancing stability.

Main Methods:

• Introduction of 3,3,4,4-benzophenonetetracarboxylic dianhydride (BPTCD) as an additive during perovskite crystallization.
• Microstructure characterization to analyze the effect of BPTCD on perovskite film morphology.
• Evaluation of photodetector performance, including dark current, on/off ratio, and detectivity.

Main Results:

• BPTCD additive facilitated the formation of high-quality, compact, and nearly pinhole-free MAPbI3 films.
• Carbonyl groups in BPTCD were identified as crucial for promoting MAPbI3 nucleation and crystallization.
• Achieved photodetectors with low dark current (9.98 × 10⁻⁸ A at -0.5 V), an on/off ratio of 10³, and high detectivity (>10¹² Jones).

Conclusions:

• Microstructure control using BPTCD is an effective strategy to enhance perovskite photodetector performance.
• The developed method yields high-efficiency and stable photodetectors with significantly reduced dark current.
• This approach offers a promising pathway for advancing perovskite-based optoelectronic devices.