p-Type NiO Hybrid Visible Photodetector

John Mallows, Miquel Planells, Vishal Thakare, Reshma Bhosale, Satishchandra Ogale, Neil Robertson

Research output: Contribution to journalArticlepeer-review

Abstract

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 π 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 × 10–2 A W–1 in 460 nm light.
Original languageEnglish
Pages (from-to)27597-27601
JournalACS Applied Materials & Interfaces
Volume7
Issue number50
Early online date10 Dec 2015
DOIs
Publication statusPublished - 23 Dec 2015

Keywords

  • photodetector
  • nickel oxide
  • organic
  • surface modifier
  • oxygen vacancies
  • pulsed laser deposition

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