Ferroelectric WS2/Graphene Phototransistor

High detectivity without gate bias

Achieves band engineering and carrier redistribution via ferroelectric polarization doping, enabling excellent optoelectronic performance without external gate bias.

She, Junyi · Xin-Xin, Liu · Liu, Haoliang · Yu, Hao · Xiao, Bing · Cheng, Yonghong · Yin, Zongyou · Meng, Guodong

Nano Letters 2025

Specifications

Detectivity

{'zh': '2.38 × 10¹³', 'en': '2.38 × 10¹³'} Jones

Photogain

{'zh': '3.28 × 10⁷', 'en': '3.28 × 10⁷'}

Advantages

No gate bias needed

Ferroelectric polarization doping tunes the band structure and achieves ideal electrical contact, enabling zero-gate operation and simplifying circuit design while reducing power consumption.

Enhanced gain mechanisms

Polarization-induced floating gate introduces additional gain mechanisms through defect engineering and tunneling, significantly improving photomultiplication and carrier acceleration.

Applications

• Photodetectors：High detectivity and zero-gate operation suit low-power photodetection.
• Integrated optoelectronic logic：Ambipolar behavior enables optoelectronic logic operations.
• Image sensors：High gain enhances image sensor sensitivity.
• 2D material optoelectronics：Ferroelectric tuning addresses contact and gain challenges in 2D devices.