研究目的
Investigating the role of interface contact modulation in enhancing the efficiency and stability of CsPbIBr2 perovskite solar cells fabricated at low temperatures.
研究成果
The study demonstrates that SnO2 ETL significantly enhances the efficiency and stability of CsPbIBr2 perovskite solar cells by improving interface contact, band alignment, and perovskite crystallization. The champion device achieves a PCE of 10.81% with reduced hysteresis and improved stability, highlighting the potential of SnO2 as an efficient ETL for low-temperature fabricated PSCs.
研究不足
The study focuses on low-temperature fabrication processes, which may limit the comparison with high-temperature processed devices. The investigation is limited to ZnO and SnO2 as ETLs, and other potential ETL materials are not explored.
1：Experimental Design and Method Selection:
The study employs ZnO and SnO2 as electron transporting layers (ETLs) to modulate the band alignment and perovskite crystallization at the ETL/perovskite interface. The methodology includes low-temperature fabrication processes (<160 ℃) and systematic investigation of the effects of different ETLs on device performance.
2：Sample Selection and Data Sources:
CsPbIBr2 perovskite solar cells were fabricated using one-step spin-coating method. The samples were characterized using SEM, AFM, XRD, PL, TRPL, and J-V measurements.
3：List of Experimental Equipment and Materials:
Key materials include CsI, PbBr2, ZnO, SnO2, Spiro-OMeTAD, and Ag. Equipment includes SEM (GeminiSEM 300), AFM (Bruker Dimension Icon), UV-Vis spectrophotometer (Shimadzu UV-1800), and solar simulator (Newport, 2612A).
4：Experimental Procedures and Operational Workflow:
The process involves substrate cleaning, ETL deposition, perovskite layer spin-coating, HTL deposition, and Ag electrode evaporation. Characterization steps include morphological, optical, and electrical measurements.
5：Data Analysis Methods:
Data analysis involves comparing the performance metrics (PCE, Voc, Jsc, FF) of devices with different ETLs, analyzing interface recombination through PL and TRPL, and assessing stability over time.
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