研究目的
Investigating the use of a bismuth sul?de iodide (BiSI) interlayer to improve charge separation and photovoltaic performance in BiI3-based solar cells.
研究成果
The integration of a BiSI interlayer in BiI3-based solar cells significantly improves charge separation and photovoltaic performance, achieving a power conversion efficiency of 1.21%. The study highlights the potential of BiSI as an electron acceptor to enhance charge extraction and suggests further optimization of device architecture for higher efficiencies.
研究不足
The study is limited by the relatively low power conversion efficiency achieved (1.21%) compared to the theoretical limit (28%). The short carrier lifetimes in BiI3 and the need for optimization of film morphology and device architecture are identified as areas for further improvement.
1：Experimental Design and Method Selection:
The study employs transient optical spectroscopy to investigate charge separation in BiI3-based photoactive layers with a BiSI interlayer. The methodology includes the preparation of thin films, characterization using XRD, SEM, UV?vis spectroscopy, and transient absorption spectroscopy, and the fabrication and testing of solar cells.
2：Sample Selection and Data Sources:
Samples include BiI3 films with and without a BiSI interlayer, prepared on different substrates (Al2O3, TiO2, SnO2) and annealed at different temperatures (100 °C and 200 °C).
3：List of Experimental Equipment and Materials:
Instruments used include a PANalytical X’Pert Pro MRD diffractometer for XRD, LEO Gemini 1525 SEM for morphology studies, Shimadzu 2600 spectrophotometer for UV?vis spectra, and a nitrogen laser for transient absorption spectroscopy.
4：Experimental Procedures and Operational Workflow:
The process involves spin-coating precursor solutions for ETLs, depositing indium dimethylpentyl xanthate solution to form an In2S3 layer, spin-coating BiI3 solution, and annealing to form BiSI/BiI3 layers. Solar cells are fabricated with a structure of ITO/SnO2/BiSI/BiI3/organic HTM/Au.
5：Data Analysis Methods:
Data analysis includes determining bandgaps from Tauc plots, analyzing XRD patterns for crystallographic properties, and evaluating photovoltaic performance from J-V characteristics.
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