Kramer, Illan J.Pattantyus-Abraham, Andras G.Barkhouse, Aaron R.Wang, XihuaKonstantatos, GerasimosDebnath, RatanLevina, LarissaRaabe, InesNazeeruddin, Md. K.Graetzel, MichaelSargent, Edward H.2011-12-162011-12-162011-12-16201110.1016/j.tsf.2010.12.121https://infoscience.epfl.ch/handle/20.500.14299/73494WOS:000295347700054Colloidal quantum dot (CQD) photovoltaics combine low-cost solution processibility with quantum size-effect tunability to match absorption with the solar spectrum. Recent advances in CQD photovoltaics have led to 3.6% AM1.5 solar power conversion efficiencies. Here we report CQD photovoltaic devices on transparent conductive oxides and show that our devices rely on the establishment of a depletion region for field-driven charge transport and separation. The resultant depleted-heterojunction solar cells provide a 5.1% AM1.5 power conversion efficiency. The devices employ infrared-bandgap size-effect-tuned PbS colloidal quantum dots, enabling broadband harvesting of the solar spectrum. (C) 2010 Elsevier B.V. All rights reserved.Quantum dotSolar cellPbSTitanium dioxideDepleted heterojunctionExciton dissociationElectron transferPolymer Photovoltaic CellsInfrared PhotovoltaicsPbs NanocrystalsNanoparticlesEfficiencytext::journal::journal article::research article