研究目的
To develop a low-cost, uncooled mid-wave infrared (MWIR) photodiode using PbSe quantum dots (QDs) and CdS heterojunction fabricated via a wet-chemical synthesis route, and to investigate the effects of post-annealing on the photodiode's performance.
研究成果
The study successfully demonstrated a low-cost, uncooled MWIR photodiode using PbSe-QDs/CdS heterojunction fabricated via wet-chemical synthesis. Post-annealing was found to be critical for tailoring the photoresponse wavelength and improving performance. The use of CdSe:In as infrared transparent conductive electrodes was also validated. Future optimizations in structure design and material quality could further enhance performance.
研究不足
The performance of the photodiodes is currently lower than theoretical limits, indicating room for improvement in material quality and structural design. The study also notes the formation of micro-cracks at higher annealing temperatures, which could negatively impact device performance.
1：Experimental Design and Method Selection:
The study employed a wet-chemical synthesis route to fabricate PbSe-QDs/CdS p–n heterojunction photodiodes. Post-annealing was used to tailor the photoresponse wavelength and improve performance.
2：Sample Selection and Data Sources:
PbSe-QDs and CdS films were synthesized and characterized. The photodiodes were fabricated on Si substrates with CdSe:In as infrared transparent conductive electrodes.
3：List of Experimental Equipment and Materials:
High-Resolution Scanning Electron Microscopy (HRSEM), Fourier Transform Infrared Spectroscopy (FTIR), Hall effect measurement systems, and a home-made detectivity measurement system were used.
4：Experimental Procedures and Operational Workflow:
The synthesis involved chemical bath deposition (CBD) for PbSe-QDs and CdS films. Photodiodes were fabricated using lithography and wet-chemical etching. Post-annealing was performed at various temperatures.
5：Data Analysis Methods:
The performance of the photodiodes was evaluated by measuring responsivity and specific detectivity. Temperature-dependent spectral response was analyzed to understand the band alignment transition.
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