Ultrawide Bandgap Organic-Inorganic Hybrid Perovskite [C₆N₂H₁₈][CdCl₄] for Solar-Blind Ultraviolet Detection

Area of Science:

• Materials Science
• Optoelectronics
• Semiconductor Physics

Background:

• Solar-blind ultraviolet (UV) detection is crucial for environmental monitoring and safety systems.
• Existing inorganic UV detectors often lack flexibility and require high-temperature processing.
• Few inorganic-organic hybrid perovskites (OIHPs) possess absorption edges in the solar-blind UV region.

Purpose of the Study:

• To develop a high-performance solar-blind UV photodetector using a novel two-dimensional (2D) inorganic-organic hybrid perovskite (OIHPs).
• To explore the potential of ultrawide bandgap OIHPs as a flexible and solution-processable alternative to traditional inorganic UV detectors.

Main Methods:

• Synthesis and characterization of a two-dimensional (2D) inorganic-organic hybrid perovskite, [C6N2H18][CdCl4].
• Fabrication and testing of a photodetector device based on the synthesized OIHPs.
• Measurement of the device's optoelectronic properties, including bandgap, carrier lifetime, photocurrent, and response time under UV illumination.

Main Results:

• The [C6N2H18][CdCl4] OIHPs exhibit a direct bandgap of 5.13 eV and a long carrier lifetime of 504 μs.
• The fabricated photodetector showed a photocurrent of 152.1 nA/cm² and a fast response time of 35 μs under 254 nm UV light.
• The hybrid material demonstrated structural flexibility and low-temperature solution processability.

Conclusions:

• This study pioneers the use of ultrawide bandgap OIHPs for solar-blind UV sensing.
• The developed OIHPs-based photodetector offers a promising, flexible, and solution-processable alternative to rigid inorganic semiconductors for UV detection.
• The material's properties address limitations of traditional detectors, paving the way for advanced UV sensing technologies.