研究目的
Investigating the novel route for the preparation of α-Fe2O3 by rapid thermal oxidation of chemical sprayed FeS2 film and its application in photodetectors.
研究成果
The study successfully prepared nanostructured hematite film by one-step rapid thermal oxidation of FeS2 film deposited by chemical spray technique. The fabricated n-Fe2O3/p-Si heterojunction photodetector showed good performance with high responsivity and specific detectivity, indicating the potential of this simple and cost-effective technique for fabricating high-performance photodetectors without the need for a buffer layer or post annealing.
研究不足
The study mentions the formation of small-off stoichiometric Fe2O3 film and the presence of structural defects, which could affect the performance of the photodetector. The ideality factor of the heterojunction was larger than unity, indicating dominance of recombination current over diffusion current.
1：Experimental Design and Method Selection:
The study involves the preparation of α-Fe2O3 by rapid thermal oxidation (RTO) of chemically sprayed FeS2 film under oxygen ambient. The structural, optical, and electrical properties of the resulting films and heterojunctions were investigated.
2：Sample Selection and Data Sources:
Iron sulfide film was deposited on cleaned glass and mirror-like silicon substrates by the spray pyrolysis technique. The silicon substrate used was p-type with (111) orientation.
3：List of Experimental Equipment and Materials:
Equipment includes a rapid thermal oxidation system, x-ray diffractometer (XRD-6000, Shimadzu), scanning electron microscope (SEM, T-scan Vega III Czech), TEM (EM208, Philips), and a double–beam UV-IR 210A spectrophotometer.
4：Experimental Procedures and Operational Workflow:
The FeS2 film was deposited by spraying an aqueous solution of Iron chloride and thiourea, followed by oxidation using RTO at 550°C for 20s. The structural, morphological, and optical properties were then characterized.
5：0s. The structural, morphological, and optical properties were then characterized.
Data Analysis Methods:
5. Data Analysis Methods: The crystallite size was estimated using Scherrer equation, optical energy gap was determined from absorbance data, and electrical properties were analyzed from I-V characteristics.
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