研究目的
Investigating the construction and performance of three-dimensional radial heterojunction photodetectors for near-infrared light detection.
研究成果
The study successfully demonstrated a new 3D SiNW architecture integrating PAL/a-Ge:H/a-Si:H light absorber layer for high-performance NIR PD. The optimal thickness of a-Ge:H film was found to be 6 nm, achieving an EQE response of ~10% at 808 nm. The introduction of a 23 nm thick PAL significantly improved device performance, indicating potential for low-cost, flexible, and high-performance NIR imaging and PD applications.
研究不足
The study is limited by the defect-rich region in the a-Ge:H film and the interface between p-SiNWs and a-Ge:H, which affects device performance. Optimization of layer thicknesses is crucial for improving photovoltaic responses.
1：Experimental Design and Method Selection:
The study involved the construction of 3D radial heterojunction photodetectors over vertical crystalline Si nanowires with stacked a-Ge:H/a-Si:H thin film layers as absorbers. The design leveraged type-II band alignment for automated photo-carrier separation.
2：Sample Selection and Data Sources:
The samples were fabricated using p-type SiNWs with a typical length of 1 μm and a mean diameter of 30 nm-40 nm. The intrinsic a-Si:H absorber and n-type a-Si:H layers were deposited upon the SiNWs cores.
3：List of Experimental Equipment and Materials:
Equipment included a PECVD system for deposition, magnetron sputtering for ITO layer deposition, and a Newport Oriel Sol-1A for J-V characterization. Materials included silane (SiH4), diborane dopant (B2H6), and Germane (GeH4).
4：4).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The fabrication process involved Sn layer evaporation, SiNWs growth via VLS model, deposition of intrinsic and n-type a-Si:H layers, and ITO sputtering. The thickness of layers was varied to optimize performance.
5：Data Analysis Methods:
J-V characteristics and EQE were measured to evaluate device performance. Light distributions were simulated using COMSOL to understand absorption performance.
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