|About this Abstract
||MS&T22: Materials Science & Technology
||Energy Materials for Sustainable Development
||L-13: Cu2O Single Crystal Synthesis via Strain-Induced Abnormal Grain Growth
||Garima Aggarwal, Akhilender Jeet Singh, Balasubramaniam Kavaipatti
|On-Site Speaker (Planned)
Usage of single-crystalline Cu2O in optoelectronic devices is limited due to the complexities involved in synthesis processes. Here, we utilize strain-induced abnormal grain growth to produce single crystals in short-duration annealing of only 5 h, which is ~90 % less than conventional 48 h annealing. A 0.25 mm thick Cu-foil is cold-worked at room temperature and subjected to a three-step oxidation process at 1050 °C. The cold-working of Cu-foil increases the hardness by 20 %, indicating higher dislocation density at specific locations. This gradient in different locations of Cu foil gives rise to inhomogeneity in the microstructure, which drives the recrystallization. As edges are more exposed to this deformation, abnormal grain growth is observed at those sites. These abnormally grown grains prepared without following strict single crystal growth protocols (long duration, high-temperature synthesis) have diameters ranging from 2−10 mm, which are akin to single-crystalline Cu2O in various applications.