研究目的
Investigating the use of Pb-free low bandgap formamidinium tin iodide (HC(NH2)2-SnI3–FASnI3) as a perovskite absorber layer in solar cells to achieve an environmentally friendly economic solar cell.
研究成果
The numerical simulation showed that a trapezoidal bandgap grading configuration significantly enhances the device performance, achieving a maximum PCE of 16.30%. This study paves the path for the development of low-cost, non-toxic, and high-efficiency perovskite solar cells.
研究不足
The study is based on numerical simulation, and the actual performance may vary due to material imperfections and fabrication processes not accounted for in the simulation. The hysteresis behavior of the cells was not considered in the simulation.
1：Experimental Design and Method Selection:
The study utilized a solar cell capacitance simulator (SCAPS) to model and optimize a Pb-free HTM-free perovskite solar cell with a novel configuration. The bandgap of CH3NH3SnI3(cid:1)xBrx absorber was tuned by varying the Br doping content.
2：Sample Selection and Data Sources:
The physical parameters used in the simulation were meticulously picked up from reported experimental studies and the literature.
3：List of Experimental Equipment and Materials:
SCAPS-1D was used for simulation. The materials included ZnO as electron transport material (ETM) and CH3NH3SnI3(cid:1)xBrx as the absorber layer.
4：Experimental Procedures and Operational Workflow:
The simulation was carried out under an illumination of 1000 W/m2, temperature of 27 °C, and an AM
5：5 solar spectrum. The bandgap and electron affinity of the CH3NH3SnI3(cid:
1)xBrx active layer were varied with Br concentration.
6：Data Analysis Methods:
The output parameters like J–V characteristics, energy band, quantum efficiency, generation and recombination profiles were calculated by solving Poisson’s equation and continuity conditions of charge carriers.
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