*
Corresponding authors
a
Solar Energy Research Institute, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
E-mail:
asri@ukm.edu.my
Tel: +603 8911 8580
b
Institute of Sustainable Energy (ISE), Universiti Tenaga Nasional (UNITEN), Jalan IKRAM-UNITEN, 43000 Kajang, Selangor, Malaysia
c
Center for Organic Electronics and Alternative Energy, Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand
E-mail:
siriporn.j@ubu.ac.th
Tel: +66 8 1692 4610
d
Department of Engineering, Faculty of Environment, Science and Economy, University of Exeter, Penryn Campus, Cornwall TR10 9FE, UK
E-mail:
hu203@exeter.ac.uk
e
Department of Chemistry, Islamia College Peshawar, Khyber Pakhtunkhwa, Pakistan
f
Physics Department, Faculty of Science, Universiti Teknologi Malaysia, Johor Bahru, Johor, Malaysia