Near-infrared photodetector consisting of J-aggregating cyanine dye and metal oxide thin films

Publication Type:

Journal Article

Source:

Appl. Phys. Lett., AIP Publishing, Volume 101, Issue 11, p.113303 (2012)

ISBN:

0003-6951

Keywords:

2012, 2013 and earlier

Abstract:

We demonstrate a near-infrared photodetector that consists of a thin film of the J-aggregating cyanine dye, U3, and transparent metal-oxide charge
transport layers. The high absorption coefficient of the U3 film, combined
with the use of a reflective anode and optical spacer layer, results in a
zero-bias external quantum efficiency of 16.1 ± 0.1% (λ = 756 nm) for a
device containing an 8.1 ± 0.3 nm-thick U3 film. The specific detectivity
(D*) and response speed (f 3 dB ) of a fully optimized device are measured
to be (4.3 ± 0.1) × 1011 cm Hz1/2 W−1 and 92 kHz, respectively.