| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Dislocations in Ceramics: Processing, Structure, Mechanics, and Functionality
|
| Presentation Title |
Dislocation-Modified Photoelectric Properties of Oxide Ceramics |
| Author(s) |
Mehrzad Soleimany, Maximilian Kissel, Lukas Porz, Till Frömling, Marin Alexe, Jürgen Rödel |
| On-Site Speaker (Planned) |
Mehrzad Soleimany |
| Abstract Scope |
Controlling point defects and interfaces is the usual way to tailor semiconducting ceramics' electrical and photoelectric properties. Dislocations as one-dimensional line defects have so far been mostly disregarded for modification of functional properties because of the brittle nature of ceramics. However, they are finding increasing attention recently. They provide the opportunity to modify the materials' functional properties, e.g., ferroelectric properties, thermal, electronic, and ionic conductivity. This work illustrates the impact of dislocations on the photoelectric properties of ZnS and donor doped SrTiO3. We reveal that the materials can be plastically deformed at room temperature using ball indentation and cyclic loading without the formation of cracks, which leads to the increase of the dislocation density by three orders of magnitude. Utilizing photocurrent measurements, especially local investigations by a conductive atomic force microscope under laser illumination, an increase in the current can be rationalized due to the presence of dislocations. |
| Proceedings Inclusion? |
Undecided |