Format

Send to

Choose Destination
See comment in PubMed Commons below
Nat Nanotechnol. 2009 Jan;4(1):40-4. doi: 10.1038/nnano.2008.313. Epub 2008 Nov 9.

Fast, sensitive and spectrally tuneable colloidal-quantum-dot photodetectors.

Abstract

Solution-processed semiconductors are compatible with a range of substrates, which enables their direct integration with organic circuits, microfluidics, optical circuitry and commercial microelectronics. Ultrasensitive photodetectors based on solution-process colloidal quantum dots operating in both the visible and infrared have been demonstrated, but these devices have poor response times (on the scale of seconds) to changes in illumination, and rapid-response devices based on a photodiode architecture suffer from low sensitivity. Here, we show that the temporal response of these devices is determined by two components--electron drift, which is a fast process, and electron diffusion, which is a slow process. By building devices that exclude the diffusion component, we are able to demonstrate a >1,000-fold improvement in the sensitivity-bandwidth product of tuneable colloidal-quantum-dot photodiodes operating in the visible and infrared.

PMID:
19119281
DOI:
10.1038/nnano.2008.313
[Indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Loading ...
    Support Center