DAVID ZHITOMIRSKY ET AL: 'N-Type Colloidal-Quantum-Dot Solids for Photovoltaics', ADVANCED MATERIALS, vol. 24, no. 46, 4 December 2012 (2012-12-04), DE, pages 6181 - 6185, XP055638171, ISSN: 0935-9648, DOI: 10.1002/adma.201202825