1. Department of Chemistry the Materials Research Center and the Argonne‐Northwestern Solar Energy Research Center Northwestern University 2145 Sheridan Road Evanston IL 60208 USA
2. Department of Materials Science and Engineering the Materials Research Center and the Argonne‐Northwestern Solar Energy Research Center Northwestern University 2145 Sheridan Road Evanston IL 60208 USA
3. Chemical Sciences and Engineering Division Argonne National Laboratory 9700 South Cass Avenue Lemont IL 60439 USA
4. Flexterra Corporation 8025 Lamon Avenue Skokie IL 60077 USA