研究目的
To achieve ultrahigh-speed color/spectrum-sensitive photodetection using an in situ formed gradient bandgap-tunable perovskite absorber film.
研究成果
The study demonstrates a filterless color/spectrum-sensitive photodetector with ultrahigh-speed response and high spectral resolution, achieving a response time down to 71 ns and a spectral resolution of around 80 nm. The interfacial capacitance influenced by the electron-donor of absorber is identified as key for the response time.
研究不足
The study is limited by the mechanical system of the optical chopper, measuring response time at a maximum frequency of 3.5 kHz. The device area could be further reduced to accelerate response time.
1：Experimental Design and Method Selection:
The study employs an in situ formed gradient perovskite absorber film with continuously tunable bandgap for color/spectrum-sensitive photodetection.
2：Sample Selection and Data Sources:
The perovskite film is fabricated using a sequential deposition strategy with MACl precursor spin-coated on potassium chloride doped PbClBr film.
3：List of Experimental Equipment and Materials:
Includes SEM for morphology analysis, XRD for structural analysis, XPS for elemental analysis, and ESR for vacancy confirmation.
4：Experimental Procedures and Operational Workflow:
Involves spin-coating–annealing cycles to form the perovskite film, followed by device construction and performance evaluation.
5：Data Analysis Methods:
Utilizes UV–vis absorption spectra, UPS for energy band structure, SCLC for electron mobility, and EIS for capacitance analysis.
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