Facile Fabrication of PbS Nanocrystal:C60 Fullerite Broadband Photodetectors with High Detectivity. (11th March 2013)

• Record Type: Journal Article
• Authors: Saran, Rinku; Nordin, Muhammad N.; Curry, Richard J.
• Is Part Of: Advanced functional materials. Volume 23:Number 33(2013)
• Page Start: 4149
• Page End: 4155
• Publication Date: 2013-03-11
• Subjects: Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201202818
• Languages: English
• ISSNs: 1616-301X

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Hybrid PbS nanocrystal/C₆₀ fullerite photodetectors are fabricated using a simple one‐step drop casting procedure onto pre‐patterned interdigitated electrodes. The devices exhibit a broad spectral response from the near UV through to the near infrared yielding a detectivity, <italic>D*</italic>, of above 10¹⁰ Jones from 400 nm to ≈1050 nm. The ability to further extend the spectral response to wavelengths ≈1350 nm in the near infrared via tuning of the PbS nanocrystal diameter is also demonstrated. The dynamic responses of the devices are presented, exhibiting a fast photocurrent rise time (&lt;40 ns) followed by a long bi‐exponential decay with characteristic lifetimes of <italic>τ</italic>₁ = 5.3 μs ± 0.1 μs and <italic>τ</italic>₂ = 37.8 μs ± 0.7 μs. These devices, which have a detectivity approaching that of commercial detectors, a broader spectral response, and a fast rise time, offer an attractive low‐cost solution for large‐area broadband photodetectors.</p> </abstract>