研究目的
Investigating the effect of grain size on the fracture behavior of organic-inorganic halide perovskite (OIHP) thin films for solar cells to improve their mechanical reliability.
研究成果
Coarse-grained OIHP films are more desirable for improved PSCs performance, stability, and mechanical reliability due to their higher toughness compared to fine-grained films. The study highlights the importance of grain size in determining the fracture behavior of OIHP thin films.
研究不足
The study is limited to MAPbI3 thin films and may not be directly applicable to other OIHP materials. The naturally formed grooves assumed to represent grain boundaries can lead to some overestimation of the grain size.
1：Experimental Design and Method Selection:
The study involved the preparation of fine-grained and coarse-grained MAPbI3 thin films using 'solvent-engineering' and 'solvent-annealing' methods, respectively. The mechanical behavior was characterized using double cantilever beam (DCB) specimens.
2：Sample Selection and Data Sources:
Glass substrates coated with SnO2 as an electron-transport layer (ETL) were used. MAPbI3 thin films were solution-deposited on these substrates.
3：List of Experimental Equipment and Materials:
SEMs (LEO 1530 VP, Zeiss, Germany or Quattro ESEM, ThermoFisher Scientific, USA), X-ray diffraction (Discovery D8, Bruker, Germany), and a Delaminator apparatus (DTS, USA) for mechanical testing.
4：Experimental Procedures and Operational Workflow:
The DCB specimens were loaded in tension to 'peel' the specimen apart, and the load-displacement response was recorded. The toughness was calculated using the compliance method.
5：Data Analysis Methods:
The toughness G_C was calculated using the relation provided, and the grain sizes were determined using the linear-intercept method on SEM images.
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