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High-Speed and High-Responsivity Blue Light Photodetector with an InGaN NR/PEDOT:PSS Heterojunction Decorated with Ag
Liang Chen1,2, Shaohua Xie1, Jianyu Lan3
1State Key Laboratory of Luminescent Materials and Devices, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China.
ACS Applied Materials & Interfaces
|May 22, 2024
Summary
High-performance blue light photodetectors were developed using Indium Gallium Nitride (InGaN) nanorods (NRs) and silver nanowires (Ag NWs). This novel heterojunction design significantly enhances photoelectric conversion efficiency and photoresponse speed for visible light communication.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Indium Gallium Nitride (InGaN) nanorod (NR) photodetectors (PDs) are crucial for visible light communication due to their tunable absorption.
- However, high surface states in InGaN NRs limit photoelectric conversion efficiency and photoresponse speed, hindering high-performance blue light PD development.
Purpose of the Study:
- To develop high-performance InGaN NR-based blue light photodetectors with enhanced responsivity and speed.
- To overcome limitations posed by surface states and improve light absorption.
Main Methods:
- Fabrication of InGaN NR/PEDOT:PSS@Ag nanowire (NW) heterojunction photodetectors.
- Utilizing PEDOT:PSS for surface passivation of InGaN NRs to reduce dark current.
- Employing Ag NWs to enhance light absorption via localized surface plasmon resonance (LSPR).
Main Results:
- Demonstrated significant reduction in dark current through PEDOT:PSS passivation.
- Achieved substantial increase in photoelectric conversion efficiency due to Ag NWs' LSPR effect.
- Obtained high performance metrics: responsivity (2.9 A/W), external quantum efficiency (856%), detectivity (6.64 × 10^10 Jones), and fast fall/off times (439/725 μs) at 420 nm.
Conclusions:
- The InGaN NR/PEDOT:PSS@Ag NW heterojunction design offers a promising strategy for high-performance blue light PDs.
- This approach enables low-cost, high-responsivity, and high-speed photodetectors for visible light communication applications.
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