1. Polymer Energy Materials Laboratory School of Applied Chemical Engineering Chonnam National University Gwangju 61186 South Korea
2. Institute of Physical Chemistry Polish Academy of Sciences Kasprzaka 44/52 Warsaw 01‐224 Poland
3. Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA 02139 USA
4. Department of Materials Science and Engineering Sharif University of Technology Tehran 14588 Iran
5. Department of Solar Energy School of Technology Pandit Deendayal Petroleum University Gandhinagar Gujarat 382 007 India