p-Type NiO Hybrid Visible Photodetector

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• 作者：John Mallows ; Miquel Planells ; Vishal Thakare ; Reshma Bhosale ; Satishchandra Ogale ; Neil Robertson
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：December 23, 2015
• 年：2015
• 卷：7
• 期：50
• 页码：27597-27601
• 全文大小：285K
• ISSN：1944-8252

文摘

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.