Optimization of Organic Photodetector Performance Using SCAPS 1D Simulation: Enhanced Quantum Efficiency and...

Area of Science:

• Organic electronics
• Photodetector technology
• Materials science

Background:

• Organic photodetectors offer potential for low-cost, flexible UV sensing.
• Achieving intrinsic spectral selectivity without optical filters remains a challenge.

Purpose of the Study:

• To numerically optimize an organic UV photodetector using SCAPS-1D simulations.
• To achieve intrinsic UV spectral selectivity through material and device parameter engineering.
• To enhance photodetector performance metrics like responsivity and detectivity.

Main Methods:

• Utilized SCAPS-1D software for numerical device simulation and optimization.
• Systematically varied active layer thicknesses, doping concentrations, and electrode work functions.
• Investigated the impact of different metal contacts (Al vs. Au) on device performance.

Main Results:

• Identified optimal thicknesses (1200 nm PTB7, 1000 nm Spiro-OMeTAD) and doping levels.
• Demonstrated that a Gold (Au) back contact improves hole extraction and reduces dark current.
• Achieved peak external quantum efficiency ~80% in the 300-400 nm range with responsivity up to 0.4 A/W.

Conclusions:

• The optimized organic photodetector exhibits strong UV selectivity and high sensitivity.
• The simulation-guided design approach provides a framework for developing advanced organic UV detectors.
• Potential applications include environmental sensing, biomedical diagnostics, and wearable optoelectronics.