研究目的
Investigating the effects of barium doping on the phase segregation and band gap reduction in mixed-halide inorganic perovskite solar cells to enhance their efficiency and stability.
研究成果
The addition of barium to CsPbI2Br induces phase segregation without incorporating into the perovskite lattice, leading to a reduction in band gap and suppression of non-radiative recombination. This results in high-performance inorganic perovskite solar cells with a PCE of 14.0% and a VOC of 1.33 V, demonstrating the potential of barium doping for enhancing solar cell efficiency and stability.
研究不足
The study is limited to the specific composition of CsPb1–xBaxI2Br and may not be directly applicable to other perovskite compositions. The mechanism of barium-induced phase segregation and its universal applicability to other systems require further investigation.
1：Experimental Design and Method Selection:
The study involved the preparation of CsPb1–xBaxI2Br perovskite films with varying barium concentrations (x = 0 to 1) using a one-step spin-coating method on mesoporous TiO2 substrates, followed by annealing. Optical, structural, and photovoltaic characterizations were performed to assess the impact of barium doping.
2：Sample Selection and Data Sources:
Perovskite films were prepared from precursor solutions of CsI, PbI2, PbBr2, CsBr, and BaI2 in anhydrous dimethylsulfoxide (DMSO).
3：List of Experimental Equipment and Materials:
Equipment included a spin coater, XRD diffractometer, UV-vis spectrophotometer, PL spectrometer, SEM, XPS, and solid-state NMR spectrometer. Materials included CsI, PbI2, PbBr2, CsBr, BaI2, DMSO, and mesoporous TiO2 substrates.
4：Experimental Procedures and Operational Workflow:
Films were spin-coated and annealed at 280 °C. Characterization involved XRD for structural analysis, UV-vis and PL for optical properties, SEM for morphology, XPS for surface analysis, and NMR for phase segregation analysis.
5：Data Analysis Methods:
Data from XRD, UV-vis, PL, SEM, XPS, and NMR were analyzed to understand the structural, optical, and electronic changes induced by barium doping.
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