研究目的
To balance high efficiency and poor stability of organic-inorganic hybrid photovoltaics through precise stress control during perovskite grain growth process to obtain high-quality full-bromine CsPbBr3 halide films.
研究成果
The study demonstrates that precise stress control on CsPbBr3 perovskite films through optimized PbBr2 crystallization temperature can significantly enhance the efficiency and stability of all-inorganic perovskite solar cells. The champion device achieved a PCE of 10.71% and an ultrahigh Voc of 1.622 V, with remarkable stability in high humidity conditions.
研究不足
The study is limited by the technical constraints of controlling the crystallization temperature precisely and the potential for pinhole formation in CsPbBr3 films at higher temperatures. The application is constrained to laboratory-scale solar cells without encapsulation.
1：Experimental Design and Method Selection:
The study involves the fabrication of all-inorganic CsPbBr3 perovskite solar cells through a multi-step solution-processed spin-coating method. The methodology focuses on controlling the crystallization temperature of PbBr2 films to optimize the morphology of CsPbBr3 perovskite films.
2：Sample Selection and Data Sources:
The samples include PbBr2 and CsPbBr3 films fabricated at various crystallization temperatures. Data sources include SEM images, XRD patterns, UV-vis absorption spectra, and photovoltaic measurements.
3：List of Experimental Equipment and Materials:
Equipment includes a field-emission scanning electron microscope (SEM, S4800 and SU8020, Hitachi), X-ray diffractometer (Bruker D8 ADVANCE), spectrophotometer (Meipuda UV-3200), spectrofluorometer (FluoroMax-4), and solar simulator (Newport, Oriel Class A, 91195A). Materials include PbBr2, CsBr, SnO2 QDs, and N-CQDs.
4：Experimental Procedures and Operational Workflow:
The procedure involves depositing SnO2 QDs onto FTO glass, spin-coating PbBr2 solution at various temperatures, converting PbBr2 to CsPbBr3 with CsBr solution, and applying N-CQDs and carbon back electrode.
5：Data Analysis Methods:
Data analysis includes calculating lattice volumes, analyzing SEM and XRD data, and evaluating photovoltaic performance through J-V curves and IPCE spectra.
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