Inorganic Perovskite Quantum Dot-Based Strain Sensors for Data Storage and In-Sensor Computing.

Area of Science:

• Materials Science
• Nanotechnology
• Electronics

Background:

• Stretchable strain sensors face challenges in intelligent sensing, data processing, and scalable fabrication.
• Quantum dots (QDs) offer unique optoelectronic properties for advanced sensor development.

Purpose of the Study:

• To develop a multifunctional, stretchable strain sensor with intelligent sensing capabilities.
• To integrate CsPbBr3 QDs into a field-effect transistor (FET) for enhanced performance and UV detection.
• To emulate artificial synapse functions for neuromorphic computing applications.

Main Methods:

• Fabrication of a CsPbBr3 quantum dots (QDs) floating-gate field-effect transistor (FET) sensing array on polyimide (PI) films.
• Characterization of the FET's electrical properties, including on/off ratio and memory window.
• Evaluation of the device's strain-sensing performance under compressive and tensile strains.
• Investigation of the UV response due to photogenerated charge carriers in CsPbBr3 QDs.
• Emulation of synapse functions (LTP, LTD) at the device level.

Main Results:

• The fabricated FET exhibited an excellent on/off ratio (>10^3) and a large memory window (>2 V).
• The device demonstrated a wide sensing range from +12.5% (compressive) to -10.8% (tensile) strain.
• Introduction of CsPbBr3 QDs enabled an additional UV response, enhancing source-drain current (IDS).
• Excellent data retainability and mechanical durability confirmed sensor reliability.
• Successful emulation of synapse functions (LTP/LTD) with distinct sensing mechanisms under varying conditions.

Conclusions:

• The CsPbBr3 QD-based FET strain sensor offers multifunctional intelligent sensing capabilities.
• The device shows potential for applications in wearable electronics, robotics, and neuromorphic computing.
• Integration of QDs enhances sensor performance and introduces novel functionalities like UV detection.