Hot electron induced NIR detection in CdS films

Alka Sharma, Rahul Kumar, Biplab Bhattacharyya, Sudhir Husale

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

We report the use of random Au nanoislands to enhance the absorption of CdS photodetectors at wavelengths beyond its intrinsic absorption properties from visible to NIR spectrum enabling a high performance visible-NIR photodetector. The temperature dependent annealing method was employed to form random sized Au nanoparticles on CdS films. The hot electron induced NIR photo-detection shows high responsivity of ∼780 mA/W for an area of ∼57 μm 2. The simulated optical response (absorption and responsivity) of Au nanoislands integrated in CdS films confirms the strong dependence of NIR sensitivity on the size and shape of Au nanoislands. The demonstration of plasmon enhanced IR sensitivity along with the cost-effective device fabrication method using CdS film enables the possibility of economical light harvesting applications which can be implemented in future technological applications.

Original languageEnglish
Article number22939
JournalScientific reports
Volume6
DOIs
Publication statusPublished - 2016 Mar 11
Externally publishedYes

ASJC Scopus subject areas

  • General

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