研究目的
Investigating the use of core–shell Au@CdS nanospheres for passivating perovskite grain boundaries and interfaces to improve the efficiency and stability of perovskite solar cells.
研究成果
The Au@CdS-based perovskite solar cell device achieves a high efficiency of over 21%, with excellent stability of ≈90% retention of initial power conversion efficiencies after 45 days storage in dry air. This promising approach provides a new interface engineering direction with inorganic core–shell NPs for achieving high-efficiency and stable PSCs.
研究不足
The study does not discuss the scalability of the synthesis process for Au@CdS nanospheres or the long-term stability under varying environmental conditions beyond dry air.
1：Experimental Design and Method Selection:
The study introduces a new strategy based on core–shell Au@CdS nanospheres to passivate perovskite grain boundaries and the perovskite/hole transport layer interface via an antisolvent process.
2：Sample Selection and Data Sources:
Mixed ternary cation perovskite films were produced from a solution of cesium iodide, formamidinium iodide, methylammonium bromide, PbI2, and PbBr2 in a mixed solvent of N,N-dimethylformamide and dimethyl sulfoxide.
3：List of Experimental Equipment and Materials:
The synthesis of core–shell structure material Au@CdS was carried out in an air ambient with a suitable-size Au NP in the aqueous growth solution of CdS.
4：Experimental Procedures and Operational Workflow:
The perovskite films are prepared by two steps: first, 1000 rpm for 5 s; and second, 5000 rpm for 30 s. During the last 10 s of the finished spin-coating of perovskite films, 180 μL Au@CdS CB solution was pipetted onto the spinning film for templating the nucleation and growing the perovskite crystals.
5：Data Analysis Methods:
The performance of the devices was measured using a B1500 A semiconductor parameter analyzer under an AAA class Oriel Sol3A solar simulator equipped with an AM 1.5G filter.
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