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

作者：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

来源：Nature Nanotechnology, 2011, 6(11): 733-739.

DOI：10.1038/NNANO.2011.159

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.

• 出版日期2011-11