Plasmonic light trapping leads to responsivity increase in colloidal quantum dot photodetectors

F. Pelayo García De Arquer, Fiona J. Beck, Mara Bernechea, Gerasimos Konstantatos*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)

Abstract

We report broadband responsivity enhancement in PbS colloidal quantum dot (CQDs) photoconductive photodetectors due to absorption increase offered by a plasmonic scattering layer of Ag metal nanoparticles. Responsivity enhancements are observed in the near infrared with a maximum 2.4-fold increase near the absorption band edge of ∼1 μm for ∼400 nm thick devices. Additionally, we study the effect of the mode structure on the efficiency of light trapping provided by random nanoparticle scattering in CQD films and provide insights for plasmonic scattering enhancement in CQD thin films.

Original languageEnglish
Article number043101
JournalApplied Physics Letters
Volume100
Issue number4
DOIs
Publication statusPublished - 23 Jan 2012
Externally publishedYes

Fingerprint

Dive into the research topics of 'Plasmonic light trapping leads to responsivity increase in colloidal quantum dot photodetectors'. Together they form a unique fingerprint.

Cite this