Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 50, Pages 27597-27601Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b09291
Keywords
photodetector; nickel oxide; organic; surface modifier; oxygen vacancies; pulsed laser deposition
Funding
- U.K.-India Education and Research Initiative (UKTERI)
- EPSRC Apex project
- EPSRC [EP/M023532/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M023532/1, 1365654] Funding Source: researchfish
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A novel hybrid visible-light photodetector was created using a planar p-type inorganic NiO layer in a junction with an organic electron acceptor layer. The effect of different oxygen pressures on formation of the NiO layer by pulsed laser deposition shows that higher pressure increases the charge carrier density of the film and lowers the dark current in the device. The addition of a monolayer of small molecules containing conjugated pi systems and carboxyl groups at the device interface was also investigated and with correct alignment of the energy levels improves the device performance with respect to the quantum efficiency, responsivity, and photogeneration. The thickness of the Organic layer was also optimized for the device, giving a responsivity of 1.54 X 10(-2) A W-1 in 460 nm light.
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