1. Materials Science Engineering Program and Department of Electrical and Computer Engineering University of California San Diego La Jolla CA 92093 USA
2. Center for Optoelectronic Materials and Devices School of Polymer Science and Engineering The University of Southern Mississippi Hattiesburg MS 39406 USA
3. Dave C. Swalm School of Chemical Engineering and Center for Advanced Vehicular Systems Mississippi State University Mississippi State Starkville MS 39762 USA