High response organic deep ultraviolet photodetector with PEDOT:PSS anode

Area of Science:

• Organic electronics
• Photodetector technology
• Deep ultraviolet (DUV) applications

Background:

• Organic photodetectors (PDs) are crucial for various optical sensing applications.
• Developing efficient and sensitive DUV PDs remains a significant challenge in optoelectronics.

Purpose of the Study:

• To fabricate and characterize a novel organic deep ultraviolet photodetector (PD).
• To investigate the performance metrics, including dark current, photocurrent, responsivity, and detectivity.
• To explore the underlying mechanisms for high performance and illumination intensity dependence.

Main Methods:

• Fabrication of an organic PD using PEDOT:PSS (PH 1000) as a transparent anode.
• Utilizing NPB as the electron donor and PBD as the electron acceptor.
• Characterization of the PD's electrical and optical properties under DUV illumination.

Main Results:

• The organic PD demonstrated a low dark current of 0.0829 μA/cm² and a high photocurrent of 85.3 μA/cm² at -12 V under 280 nm illumination.
• Achieved a peak responsivity of 0.18 A/W at 280 nm and a broad response range from 248-370 nm.
• Attained a high detectivity of 1.1×10¹² cm Hz^(1/2) W⁻¹.

Conclusions:

• The fabricated organic PD exhibits excellent performance for DUV detection.
• The device shows potential for applications requiring high sensitivity and detectivity in the deep ultraviolet spectrum.
• Further investigation into performance mechanisms and intensity dependence provides insights for future device optimization.