When Nanowires Meet Ultrahigh Ferroelectric Field–High-Performance Full-Depleted Nanowire Photodetectors

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• 作者：Dingshan Zheng ; Jianlu Wang ; Weida Hu ; Lei Liao ; Hehai Fang ; Nan Guo ; Peng Wang ; Fan Gong ; Xudong Wang ; Zhiyong Fan ; Xing Wu ; Xiangjian Meng ; Xiaoshuang Chen ; Wei Lu
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：April 13, 2016
• 年：2016
• 卷：16
• 期：4
• 页码：2548-2555
• 全文大小：535K
• 年卷期：0
• ISSN：1530-6992

文摘

One-dimensional semiconductor nanowires (NWs) have been widely applied in photodetector due to their excellent optoelectronic characteristics. However, intrinsic carrier concentration at certain level results in appreciable dark current, which limits the detectivity of the devices. Here, we fabricated a novel type of ferroelectric-enhanced side-gated NW photodetectors. The intrinsic carriers in the NW channel can be fully depleted by the ultrahigh electrostatic field from polarization of P(VDF-TrFE) ferroelectric polymer. In this scenario, the dark current is significantly reduced and thus the sensitivity of the photodetector is increased even when the gate voltage is removed. Particularly, a single InP NW photodetector exhibits high-photoconductive gain of 4.2 × 10⁵, responsivity of 2.8 × 10⁵ A W^–1, and specific detectivity (D*) of 9.1 × 10¹⁵ Jones at λ = 830 nm. To further demonstrate the universality of the configuration we also demonstrate ferroelectric polymer side-gated single CdS NW photodetectors with ultrahigh photoconductive gain of 1.2 × 10⁷, responsivity of 5.2 × 10⁶ A W^–1 and D* up to 1.7 × 10¹⁸ Jones at λ = 520 nm. Overall, our work demonstrates a new approach to fabricate a controllable, full-depleted, and high-performance NW photodetector. This can inspire novel device structure design of high-performance optoelectronic devices based on semiconductor NWs.