1. Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia
2. Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Malaysia
3. Center of Molecular Materials for Photonics and Electronics (CMMPE), Department of Engineering, University of Cambridge, Cambridge, UK
4. Department of Engineering Physics, École Polytechnique de Montreal, Montreal, Quebec, Canada