Enabling NIR imaging at room temperature using quantum dots
2011
Imaging in visible light at room temperature is now a well-mastered technology, whereas imaging in the near infrared
(NIR) remains a challenge. NIR imaging has many applications like sensing, night vision and biological diagnostics.
Unfortunately, silicon detectors are inefficient above 1000 nm, and other IR technologies still need low working
temperatures and are thus expensive. Colloidal quantum dots can overcome these limitations thanks to their absorption
wavelength tunability depending on their chemical composition and size. After a brief review of this research field, we
will present the preparation of hybrid photodetectors using NIR absorbing PbS quantum dots in combination with
poly(3-hexylthiopene) and PCBM. We discuss different solution based deposition processes for device fabrication (spincoating,
dip-coating, doctor blading, inkjet printing). Preliminary device tests result in a detectivity of 4.7.10 9 Jones at
1300 nm.
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