研究目的
To improve the photovoltaic performance and thermostability of all-inorganic CsPbI2Br perovskite solar cells by tuning the energetics of ZnO electron transport material via the doping of a classical alkali metal carbonate Cs2CO3.
研究成果
The doping of Cs2CO3 in ZnO ETMs effectively tunes the energy levels and improves the electron transport property, leading to enhanced photovoltaic performance and thermostability of CsPbI2Br PeSCs. The optimized devices achieved high power conversion efficiencies and retained a significant portion of their initial efficiency after aging at high temperatures.
研究不足
The study focuses on the doping effect of Cs2CO3 on ZnO ETMs and its impact on CsPbI2Br PeSCs. The mechanical flexibility of perovskite films under bending stress was identified as a limitation, with cracks observed after repeated bending cycles.
1：Experimental Design and Method Selection:
The study employed a sol–gel-derived ZnO electron transport material (ETM) doped with Cs2CO3 to tune the energy levels and electrical properties. The doping effect was compared with other alkali metal compounds (CsF and K2CO3).
2：3).
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The samples included bare ZnO and doped ZnO films with varying concentrations of dopants (2 mol% to 6 mol%). The CsPbI2Br perovskite layers were deposited on these ETMs.
3：List of Experimental Equipment and Materials:
Equipment included a scanning electron microscope (SEM), ultraviolet and X-ray photoemission spectroscopies (UPS and XPS), time-resolved photoluminescence (TRPL) spectrometer, and a solar simulator for J-V measurements. Materials included PbI2, PbBr2, CsI, ZnO precursors, and dopants (Cs2CO3, CsF, K2CO3).
4：3).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The ZnO films were spin-coated on ITO-glass substrates and annealed. The CsPbI2Br precursor solution was spin-coated on the ZnO ETMs, followed by annealing. The devices were completed with Spiro-OMeTAD, MoO3, and Ag layers.
5：Data Analysis Methods:
The performance of PeSCs was analyzed using J-V curves, EQE spectra, and stability tests under various conditions.
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