研究目的
Investigating the photovoltaic response from graphene/HgTe quantum-dot junction and its potential for next-generation infrared optoelectronics.
研究成果
The study demonstrates the fabrication of graphene/HgTe quantum-dot vertical junctions with gate-tunable photovoltaic responses. The energy band diagram provides fundamental understanding of interfacial photocarrier transport, opening possibilities for graphene as infrared transparent electrodes in photovoltaic devices.
研究不足
The spectral response of graphene-based vertical photodetectors is limited within visible and near-infrared by the constitutive materials. The study focuses on extending this range to mid-wave and long-wave infrared using HgTe CQDs.
1：Experimental Design and Method Selection:
The study involves the fabrication of graphene/HgTe quantum-dot vertical junctions to investigate photovoltaic responses. The methodology includes the synthesis of HgTe colloidal quantum dots, device fabrication, and characterization of photoresponse characteristics under various gate voltages.
2：Sample Selection and Data Sources:
HgTe colloidal quantum dots with different sizes were synthesized and used to form junctions with graphene. The spectral response was matched with the absorption spectra of HgTe CQDs.
3：List of Experimental Equipment and Materials:
Equipment includes a semiconductor analyzer (B1500A, Keysight) for photocurrent and dark conductance measurements, and a Fourier transform IR spectrometer (tensor 27, Bruker) for absorption spectra measurement. Materials include HgTe CQDs, graphene, and substrates with SiO
4：Experimental Procedures and Operational Workflow:
The process involves cleaning the substrate, depositing contact electrodes, transferring patterned graphene, and transferring HgTe CQDs film to form the junction. Photocurrent measurements were conducted under various gate voltages.
5：Data Analysis Methods:
The photocurrent and dark conductance data were analyzed to understand the gate-tunable photovoltaic response and interfacial photocarrier transport.
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