Effect of Grain Size on the Fracture Behavior of Organic-Inorganic Halide Perovskite Thin Films for Solar Cells
| Autor: | Mingyu Hu, Nitin P. Padture, Yuanyuan Zhou, Min Chen, Zhenghong Dai, Srinivas K. Yadavalli |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Toughness Materials science Mechanical Engineering Metals and Alloys Halide 02 engineering and technology Substrate (electronics) 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Grain size Brittleness Mechanics of Materials 0103 physical sciences Fracture (geology) General Materials Science Thin film Composite material 0210 nano-technology Perovskite (structure) |
| Zdroj: | Scripta Materialia. 185:47-50 |
| ISSN: | 1359-6462 |
| Popis: | Organic-inorganic halide perovskite (OIHP) thin films at the heart of the new perovskite solar cells (PSCs) are very brittle, limiting the mechanical reliability of PSCs. Here we show that fine-grained MAPbI3 (prototypical OIHP) films with grain size (~290 nm) smaller than the typical film thickness (~500 nm) tend to fracture intergranularly, resulting in low toughness (0.41 J.m−2). In contrast, MAPbI3/substrate interfacial fracture occurs in films with grains larger (~730 nm) than the film thickness, resulting in much higher toughness (1.14 J.m−2). Thus, coarse-grained OIHP films are deemed desirable for not only improved PSCs performance and stability but also mechanical reliability. |
| Databáze: | OpenAIRE |
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