研究目的
To develop a solution-processed photodetector with convertible single-/dual-color imaging function that can perform high-fidelity visible/NIR dual-color imaging without any power supply and can be facilely converted to a visible single-color imaging mode via applying a small bias voltage.
研究成果
A solution-processed photodetector with convertible single-/dual-color imaging function was developed, capable of high-fidelity visible/NIR dual-color imaging without any power supply and convertible to visible single-color imaging with a small bias voltage. The device exhibits fast response speed and high responsivity, demonstrating potential for advanced imaging applications.
研究不足
The study focuses on the development of a photodetector with specific materials (COi8DFIC and MAPbBr3), and the performance might vary with other materials. The response speed, while fast, may still need improvement for certain high-speed applications.
1：Experimental Design and Method Selection:
The photodetector was designed with a structure of ITO/PTAA/MAPbBr3/COi8DFIC/Ag. PTAA acts as a hole-transport layer, and COi8DFIC acts as an electron-transport layer and an NIR-light-harvesting layer.
2：Sample Selection and Data Sources:
The active materials used were a small molecule (COi8DFIC) and perovskite (MAPbBr3).
3：3). List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A Shimadzu UV-1800 spectrophotometer for absorption spectra, Hitachi SU-70 SEM for cross-section images, ESCALAB 250Xi for UPS analysis, Keithley 2400 SourceMeter for J–V curves, and a Tektronix TDS 3032C digital phosphor oscilloscope for response time measurement.
4：Experimental Procedures and Operational Workflow:
The device fabrication involved spin-coating PTAA, MAPbBr3, and COi8DFIC layers sequentially onto ITO substrates, followed by Ag electrode evaporation.
5：Data Analysis Methods:
The responsivity and specific detectivity were calculated based on the photocurrent and incident light intensity, and the noise current was measured using a fast Fourier transform signal analyzer.
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