研究目的
Investigating the use of a self-formed PbI2-dimethyl sulfoxide (DMSO) adduct in precursor PbI2 films for fabricating highly efficient and stable perovskite solar cells (PSCs) via chemical vapor deposition (CVD).
研究成果
The self-formed PbI2-DMSO adduct in unannealed PbI2 precursor films facilitates the formation of larger perovskite grains and distributes excessive PbI2 effectively, leading to reduced carrier recombination and improved device stability and efficiency. This approach is promising for the development of large-area and tandem perovskite solar cells.
研究不足
The study focuses on the CVD method for perovskite film preparation, which may have limitations in scalability and cost compared to solution-based methods. The role of excessive PbI2 in improving device performance is still under debate.
1：Experimental Design and Method Selection:
The study employs a two-step deposition process for the perovskite layer, involving spin coating of PbI2 precursor films followed by CVD deposition of organic salts to convert the films into perovskites. The effect of annealing on the precursor PbI2 films is investigated.
2：Sample Selection and Data Sources:
Precursor PbI2 films are prepared with and without annealing at 80°C for 1 min in a glovebox. These substrates are then subjected to CVD for perovskite formation.
3：List of Experimental Equipment and Materials:
Instruments include a CVD tube furnace, grazing incidence X-ray diffraction (GIXRD), scanning electron microscopy (SEM), and photoluminescence (PL) and time-resolved photoluminescence (TRPL) measurement setups.
4：Experimental Procedures and Operational Workflow:
The process involves spin coating PbI2 films, annealing (or not), CVD deposition of organic salts, and characterization of the resulting perovskite films and devices.
5：Data Analysis Methods:
The study analyzes the morphology, crystallinity, and photovoltaic performance of the perovskite films and devices, including efficiency, open-circuit voltage, short-circuit current density, and fill factor.
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