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Self-Powered Ultra-Broadband p-p MWCNTs/PdO/Si Homomorphic Heterostructure Photodetector for Dual-Channel Encrypted

Chen Rong¹, Jiayi Sun¹, Zhikun Pang¹

¹Shandong Key Laboratory of Intelligent Energy Materials, School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, China.

Small (Weinheim an Der Bergstrasse, Germany)

|July 15, 2026

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Researchers developed a self-powered ultra-broadband photodetector using a novel heterostructure. This device enhances optical communication and thermal monitoring by overcoming photocurrent degradation and improving sensitivity.

Area of Science:

Materials Science and Engineering
Optoelectronics
Nanotechnology

Background:

Ultra-broadband photodetectors (UB-PDs) are crucial for optical communication and thermal monitoring but suffer from photocurrent degradation due to charge-carrier recombination.
Lattice mismatch and interface defects in heterostructures limit the sensitivity and response speed of existing UB-PDs.

Purpose of the Study:

To demonstrate a self-powered ultra-broadband photodetector with enhanced photoelectronic characteristics.
To address photocurrent degradation and improve performance for dual-channel encrypted optical communication and thermal monitoring.

Main Methods:

Fabrication of a p-p multi-walled carbon nanotubes (MWCNTs)/PdO/p-Si homomorphic heterostructure.
Characterization of the photodetector's performance across an ultra-broad spectral range (365 nm to mid-infrared).

Keywords:

multi‐walled carbon nanotubes palladium oxide p‐p homomorphic heterostructure self‐powered ultra‐broadband photodetector

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Design and implementation of a dual-channel encrypted optical communication system and a thermal monitoring system.

Main Results:

The device achieved exceptional self-powered responsivity (0.72 A/W) and detectivity (5.85×10^13 Jones) from UV to mid-infrared wavelengths.
A high light-to-dark current ratio (>10^6) was observed under zero bias, indicating suppressed recombination.
Synergistic effects including suppressed recombination, increased photocurrent, accelerated response speed, and enhanced mid-infrared absorption contributed to the improved performance.

Conclusions:

The novel MWCNTs/PdO/p-Si heterostructure effectively overcomes photocurrent degradation in UB-PDs.
The developed photodetector enables high-security dual-channel encrypted optical communication and distance-independent thermal monitoring.
This work paves the way for advanced optoelectronic applications requiring wide-spectrum detection.