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Pyroelectric-Accelerated Perovskite Photodetector for Picosecond Light Detection and Ranging.

Liangliang Min¹, Haoxuan Sun¹, Linqi Guo¹

¹School of Physical Science and Technology, Jiangsu Key Laboratory of Thin Films, Center for Energy Conversion Materials & Physics (CECMP), Soochow University, Suzhou, 215006, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)

|March 29, 2024

Summary

This study introduces a novel pyroelectricity-based strategy using perovskite heterojunctions for faster and more sensitive photodetectors. This innovation enhances Light Detection and Ranging (LiDAR) applications by overcoming limitations of current technologies.

Keywords:

light detection and ranging perovskites photodetectors picosecond response pyroelectric effect

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Area of Science:

Materials Science
Optoelectronics
Nanotechnology

Background:

Light Detection and Ranging (LiDAR) performance is limited by photodetector speed and sensitivity.
Current LiDAR systems often rely on expensive, high-power avalanche diodes.
Existing photodetectors face constraints from carrier mobility and capacitive effects.

Purpose of the Study:

To develop a high-speed, high-sensitivity photodetector for LiDAR applications.
To overcome the limitations of conventional photodetectors using a pyroelectric effect.
To reduce energy consumption and cost in LiDAR systems.

Main Methods:

Utilized a 2D-(graded 3D) perovskite heterojunction with a pyroelectricity-based acceleration strategy.
Investigated electron-hole recombination dynamics at the 2D/3D interface during light-dark transitions.
Characterized photodetector speed, responsivity, and external quantum efficiency at zero bias.

Main Results:

Achieved record high speeds of 27.7 ns (9 mm² active area) and 176 ps (0.2 mm² active area).
Demonstrated high responsivity (0.65 A W⁻¹) and self-powered external quantum efficiency exceeding 100%.
Enabled precise centimeter-level position detection.

Conclusions:

The pyroelectric effect at the 2D/3D interface offers a novel mechanism for ultra-fast photodetection.
This approach significantly enhances photodetector sensitivity and speed, surpassing traditional limitations.
Presents a viable, cost-effective, and energy-efficient solution for advanced LiDAR applications.