Anisotropic crystallization in solution processed chalcogenide thin film by linearly polarized laser
Abstract
The low activation energy associated with amorphous chalcogenide structures offers broad tunability of material properties with laser-based or thermal processing. In this paper, we study near-bandgap laser induced anisotropic crystallization in solution processed arsenic sulfide. The modified electronic bandtail states associated with laser irritation lead to a distinctive photoluminescence spectrum, compared to thermally annealed amorphous glass. Laser crystalized materials exhibit a periodic subwavelength ripples structure in transmission electron microscopy experiments and show polarization dependent photoluminescence. Analysis of the local atomic structure of these materials using laboratory-based X-ray pair distribution function analysis indicates that laser irradiation causes a slight rearrangement at the atomic length scale, with a small percentage of S-S homopolar bonds converting to As-S heteropolar bonds. These results highlight fundamental differences between laser and thermal processing in this important class of materials.
Keywords
Cite
@article{arxiv.1612.03781,
title = {Anisotropic crystallization in solution processed chalcogenide thin film by linearly polarized laser},
author = {Tingyi Gu and Hyuncheol Jeong and Kengran Yang and Fan Wu and Nan Yao and Rodney D. Priestley and Claire E. White and Craig B. Arnold},
journal= {arXiv preprint arXiv:1612.03781},
year = {2017}
}