title: Unity quantum yield of photogenerated charges and band-like transport in quantum-dot solids.
abstract: Solid films of colloidal quantum dots show promise in the manufacture of photodetectors and solar cells. These devices require high yields of photogenerated charges and high carrier mobilities, which are difficult to achieve in quantum-dot films owing to a strong electron-hole interaction and quantum confinement. Here, we show that the quantum yield of photogenerated charges in strongly coupled PbSe quantum-dot films is unity over a large temperature range. At high photoexcitation density, a transition takes place from hopping between localized states to band-like transport. These strongly coupled quantum-dot films have electrical properties that approach those of crystalline bulk semiconductors, while retaining the size tunability and cheap processing properties of colloidal quantum dots.
authors.affiliation: Optoelectronic Materials Section, Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands.
authors.forename: Elise
authors.initials: E
authors.lastname: Talgorn
authors.forename: Yunan
authors.initials: Y
authors.lastname: Gao
authors.forename: Michiel
authors.initials: M
authors.lastname: Aerts
authors.forename: Lucas T
authors.initials: LT
authors.lastname: Kunneman
authors.forename: Juleon M
authors.initials: JM
authors.lastname: Schins
authors.forename: T J
authors.initials: TJ
authors.lastname: Savenije
authors.forename: Marijn A
authors.initials: MA
authors.lastname: van Huis
authors.forename: Herre S J
authors.initials: HS
authors.lastname: van der Zant
authors.forename: Arjan J
authors.initials: AJ
authors.lastname: Houtepen
authors.forename: Laurens D A
authors.initials: LD
authors.lastname: Siebbeles
mesh_terms: D003102:Colloids / Q000737:chemistry; D004579:Electron Transport; D004583:Electrons; D007854:Lead / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D053758:Nanoparticles / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry; D036103:Nanotechnology / Q000295:instrumentation*; D017785:Photons; D045663:Quantum Dots; D011789:Quantum Theory; D018036:Selenium Compounds / Q000737:chemistry*; D012666:Semiconductors; D013696:Temperature; D055068:Terahertz Spectroscopy / Q000379:methods
chemical_list: D003102:Colloids; D018036:Selenium Compounds; C088065:lead selenide; D007854:Lead