Media type: E-Article Title: Improved Performance of Ultrathin Cu(InGa)Se$_{\bf 2}$ Solar Cells With a Backwall Superstrate Configuration Contributor: Simchi, Hamed; Larsen, Jes; Kim, Kihwan; Shafarman, William imprint: Institute of Electrical and Electronics Engineers (IEEE), 2014 Published in: IEEE Journal of Photovoltaics Language: Not determined DOI: 10.1109/jphotov.2014.2345436 ISSN: 2156-3381; 2156-3403 Origination: Footnote: