研究目的
Investigating the effect of K+ doping on the majority charge carrier type, film morphology, and photo-physical properties of perovskite thin films for solar cells.
研究成果
The research demonstrates that K+ extrinsic doping can modulate the majority carrier type of perovskite thin films from n-type to p-type, with hole concentrations up to 1012 cm?3. However, increased doping concentrations lead to deteriorated film and interface quality, reducing device performance. This work lays the foundation for exploring perovskite homo-junction solar cells through extrinsic doping.
研究不足
The study indicates that increasing K+ doping concentration deteriorates the interface quality between the perovskite layer and TiO2, affecting electron transport and device performance. The rough surface of perovskite films at higher doping concentrations may limit practical applications.
1：Experimental Design and Method Selection:
The study involved the preparation of perovskite thin films with varying concentrations of K+ doping using a two-step solution method. The impact of doping on film morphology, interface quality, and carrier type was analyzed.
2：Sample Selection and Data Sources:
Fluorine-doped SnO2 (FTO) substrates were used as the base. Perovskite layers were prepared with different K+ doping concentrations.
3：List of Experimental Equipment and Materials:
X-ray diffractometer (XRD), scanning electron microscope (SEM), ultraviolet-visible (UV-vis) absorption spectrometer, photoluminescence (PL) testing system, Hall Impact Measurement System.
4：Experimental Procedures and Operational Workflow:
The FTO substrates were cleaned and coated with TiO2 layers. Perovskite layers were then spin-coated with varying K+ concentrations, followed by annealing. The devices were characterized for their structural, morphological, and optoelectronic properties.
5：Data Analysis Methods:
XRD for crystal structure analysis, SEM for morphology, UV-vis for absorption, PL for emission properties, and Hall measurements for carrier concentration and mobility.
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