Unity quantum yield of photogenerated charges and band-like transport in quantum-dot solids

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 quantu...

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Published inNature nanotechnology Vol. 6; no. 11; pp. 733 - 739
Main Authors Talgorn, Elise, Gao, Yunan, Aerts, Michiel, Kunneman, Lucas T, Schins, Juleon M, Savenije, T J, van Huis, Marijn A, van der Zant, Herre S J, Houtepen, Arjan J, Siebbeles, Laurens D A
Format Journal Article
LanguageEnglish
Published England Nature Publishing Group 25.09.2011
Subjects
Colloids - chemistry
Electron Transport
Electrons
Lead - chemistry
Ligands
Microscopy, Electron, Scanning
Nanoparticles - chemistry
Nanostructures - chemistry
Nanotechnology
Nanotechnology - instrumentation
Photons
Quantum Dots
Quantum Theory
Selenium Compounds - chemistry
Semiconductors
Spectrum analysis
Temperature
Terahertz Spectroscopy - methods
Netherlands
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Summary: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.
ISSN:1748-3387
1748-3395
DOI:10.1038/nnano.2011.159