研究目的
Understanding how composition affected perovskite mechanical integrity and determine design criteria to increase cohesion and reliability toward the development of module-scale devices.
研究成果
The addition of Cs and FA cations was shown to further decrease the mechanical integrity of perovskite films, largely due to the decreased grain size and addition of PbI2. Measuring the fracture toughness of single crystal perovskite showed that planar perovskite layers are inherently susceptible to fracture. Introducing plastically deformable cations such as BA led to modest increases in Gc. The most significant improvement in fracture toughness was observed by infusing perovskite into a porous TiO2/ZrO2/C scaffold that provided extrinsic reinforcement to stressors.
研究不足
The mechanically fragile nature of perovskites is a property that could inhibit the long-term success of perovskite solar cells as a viable solar technology. Planar perovskites are likely susceptible to delamination and fracture from processing, handling, and operational conditions.
1：Experimental Design and Method Selection:
A double cantilever beam (DCB) test was used to measure the cohesion energy, Gc, of the various perovskite films. Microindentation hardness testing was performed to estimate the fracture toughness of single-crystal perovskite.
2：Sample Selection and Data Sources:
Perovskite layers were deposited via solution-processed methods such as spin-coating, slot-die coating, and drop-casting. The fabrication methods included compositions of MA/FA, Cs/FA, Cs/MA/FA, BA/MA, and 5-AVA/MA.
3：List of Experimental Equipment and Materials:
Mechanical testing system, load cell, servo actuator, microindentation hardness testing system.
4：Experimental Procedures and Operational Workflow:
The specimen was positioned between the grips and loaded at a constant displacement rate until the load decreased, which corresponded to crack growth. Gc was then calculated from each critical load and averaged.
5：Data Analysis Methods:
The value of KIC was estimated from the applied load and the length of the crack measured from the center of the indent.
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