Direct pulsed laser crystallization of nanocrystals for absorbent layers in photovoltaics: Multiphysics simulation and experiment

Martin Y. Zhang, Purdue University
Qiong Nian, Purdue University
Yung Shin, Purdue University
Gary J. Cheng, Birck Nanotechnology Center, Purdue University

Date of this Version



Copyright 2013 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Appl. Phys. 113, 193506 (2013); and may be found at The following article has been submitted to/accepted by Journal of Applied Physics. Copyright 2013 Martin Y. Zhang, Qiong Nian, Yung Shin and Gary J. Cheng. This article is distributed under a Creative Commons Attribution 3.0 Unported License.


Direct pulsed laser crystallization (DPLC) of nanoparticles of photoactive material-Copper Indium Selenide (nanoCIS) is investigated by multiphysics simulation and experiments. Laser interaction with nanoparticles is fundamentally different from their bulk counterparts. A multiphysics electromagnetic-heat transfer model is built to simulate DPLC of nanoparticles. It is found smaller photoactive nanomaterials (e.g., nanoCIS) require less laser fluence to accomplish the DPLC due to their stronger interactions with incident laser and lower melting point. The simulated optimal laser fluence is validated by experiments observation of ideal microstructure. Selectivity of DPLC process is also confirmed by multiphysics simulation and experiments. The combination effects of pulse numbers and laser intensity to trigger laser ablation are investigated in order to avoid undesired results during multiple laser processing. The number of pulse numbers is inversely proportional to the laser fluence to trigger laser ablation. (C) 2013 AIP Publishing LLC.


Nanoscience and Nanotechnology