Polarization photodetectors with configurable polarity transition enabled by programmable ferroelectric-doping...

Area of Science:

• Optoelectronics
• Materials Science
• Condensed Matter Physics

Background:

• Symmetry-breaking engineering is crucial for optoelectronic devices, particularly for polarization light detection.
• Existing methods for symmetry manipulation in low-dimensional materials lack universality and prominent polarization detection capabilities.

Purpose of the Study:

• To introduce a reliable strategy for manipulating material symmetry using programmable ferroelectric-doping patterns.
• To enable spontaneous photocurrent generation and linearly polarized light detection in isotropic 2H-MoTe2.

Main Methods:

• Utilized a programmable ferroelectric-doping patterns technique to engineer symmetry in low-dimensional materials.
• Fabricated a 2H-MoTe2 photodetector to demonstrate the proposed method.
• Investigated photocurrent intensity, open-circuit voltage, and polarization ratio under varying bias conditions.

Main Results:

• Achieved significant short-circuit photocurrent intensity (Jsc = 29.9 A/cm²) and open-circuit voltage (Voc = 0.12 V) in the 2H-MoTe2 photodetector.
• Demonstrated tunable polarization ratio from 1 to ∞/-∞ by shifting between unipolar and bipolar regimes.
• Observed spontaneous photocurrent generation enabling polarization light detection.

Conclusions:

• Ferroelectric-doping patterns offer a universal approach to symmetry manipulation in low-dimensional materials.
• This technique facilitates the creation of composite materials with artificial bulk photovoltaic effects.
• The developed method shows great potential for high-performance polarization light detection applications.