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Published on: September 12, 2014
Spectral-engineered upconversion heterostructure for high performance self-powered dual-mode photodetectors
Yanan Ji1, Mingqi Wang1, Zihao Guo1
1Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Key Laboratory of Photosensitive Materials & Devices of Liaoning Province, School of Physics and Materials Engineering, Dalian Minzu University, 18 Liaohe West Road, Dalian 116600, PR China.
We developed a novel self-powered photodetector using GaAs/MoS2/upconversion nanoparticles for intelligent driving applications. This device offers both broadband and specific near-infrared detection, enhancing LiDAR and object recognition systems.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Intelligent driving systems require self-powered photodetectors (PDs) with both broadband and specific wavelength detection, especially in the near-infrared (NIR) spectrum.
- Existing heterogeneous integration of 2D materials and upconversion nanoparticles (UCNPs) faces challenges in spectral matching and carrier separation.
Purpose of the Study:
- To develop a high-performance, self-powered photodetector with dual-mode detection capabilities (broadband and narrowband).
- To overcome spectral mismatch and inefficient carrier separation issues in UCNP-based photodetectors.
Main Methods:
- Fabrication of a GaAs/MoS2/NaYF4:Yb3+,Ho3+,Ce3+ UCNP heterostructure for self-powered photodetection.
- Luminescence engineering of UCNPs by optimizing Ce3+ doping concentration for enhanced emission at 650 nm.
- Utilizing the built-in electric field at the GaAs/MoS2 interface for efficient carrier separation.
Main Results:
- Optimized UCNPs with 5 mol% Ce3+ showed enhanced emission at 650 nm, enabling optimal spectral overlap with MoS2 and GaAs.
- The heterostructure exhibited a dual-mode photoresponse: broadband detection (400-870 nm) and selective narrowband detection at 980 nm.
- Achieved zero-bias responsivity of 0.12 A/W and detectivity of 2.4×10^10 Jones at 980 nm, with fast response times (~80/98 ms).
Conclusions:
- The developed photodetector successfully integrates broadband and narrowband detection through precise spectral and heterojunction engineering.
- This work offers a new approach for compact, multifunctional optoelectronic systems for applications like intelligent driving and LiDAR.
- The device demonstrates excellent stability and anti-interference capabilities in self-powered mode.
