*
Corresponding authors
a
Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, UK
E-mail:
junginn.sohn@eng.ox.ac.uk
Fax: +44(0)-1865-273010
Tel: +44(0)-1865-273912
b
Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulsan 44919, Republic of Korea
c
Department of Energy Systems, Soonchunhyang University, Asan, Chungcheongnam-do Jeollabuk-do 31538, Republic of Korea
d
Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 139-743, Republic of Korea
E-mail:
pik@seoultech.ac.kr
Fax: +82029736657
Tel: +82029706349
e
Division of Nano Energy Convergence Research, DGIST, Daegu 42988, Republic of Korea
f
Beamline Department, Pohang Accelerator Laboratory, Pohang 790-784, Republic of Korea
g
Jeonju Center, Korea Basic Science Institute, Jeonju, Jeollabuk-do 54907, Republic of Korea
h
Division of Physics and Semiconductor Science, Dongguk University, Seoul 100-715, Republic of Korea
E-mail:
junginn.sohn@dongguk.edu