Photoelectric detector based on ferroelectric domain wall

A photodetector utilizing ferroelectric domain walls in ferroelectric crystals addresses the limitations of existing photodetectors by forming electrodes from domain walls to generate voltage and current signals, enhancing photoelectric detection efficiency and simplifying fabrication.

CN119153569APending Publication Date: 2024-12-17NANJING NANZHI INST OF ADVANCED OPTOELECTRONIC INTEGRATION NANJING
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Patent Information

Application Number
CN202411151119.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-08-21
Publication Date
2024-12-17

AI Technical Summary

Technical Problem

Current photodetectors fail to leverage the conductive properties of the domain wall of ferroelectric crystals for photodetection, particularly in lithium niobate materials, which are limited by complex processes and low practicality in heterogeneous integration.

Method used

A photodetector based on the conductivity of the domain walls of ferroelectric crystals, which are constructed with positive and negative domains, metal films, waveguides, insulating layers, substrates, and electrodes, where the domain walls are connected to form electrodes to generate voltage and current signals.

Benefits of technology

The photodetector effectively harnesses the conductive properties of ferroelectric domain walls to generate voltage and current signals, leveraging the photovoltaic effect for efficient photoelectric detection, with enhanced sensitivity and simplicity in fabrication.

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Abstract

The invention discloses a ferroelectric domain wall-based photoelectric detector, which comprises a positive domain, a negative domain, a metal film, a waveguide, an insulating layer, a substrate, a first electrode, a second electrode, a third electrode and a fourth electrode, and is characterized in that the waveguide comprises a ridge waveguide, the positive domain and the negative domain are embedded in the ridge waveguide, and a domain wall is formed between the positive domain and the negative domain; the surface of the vertical part is covered with conductive metal films, the conductive metal films are connected to form a first electrode, a second electrode, a third electrode and a fourth electrode, a substrate is arranged on the lower side of the ridge-shaped waveguide, an insulating layer is arranged between the ridge-shaped waveguide and the substrate, and when light passes through the ridge-shaped waveguide, positive and negative charges enter the four corresponding electrodes through the metal films respectively, so that the light is emitted. Therefore, a voltage or current signal is generated. According to the invention, current carriers are generated during illumination and drift is carried out according to domain polarity by utilizing the conductive characteristic and the electric polarization phenomenon of the domain wall of the ferroelectric crystal, and photoelectric detection is carried out by adopting the domain structure of the lithium niobate, so that the preparation is simple.
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