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TiO2 Nanorod Arrays Based Self-Powered UV Photodetector: Heterojunction with NiO Nanoflakes and Enhanced UV Photoresponse
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-03-20 00:00:00 , DOI: 10.1021/acsami.7b18815 Yanyan Gao 1 , Jianping Xu 1 , Shaobo Shi 2 , Hong Dong 3 , Yahui Cheng 3 , Chengtai Wei 1 , Xiaosong Zhang 1 , Shougen Yin 1 , Lan Li 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-03-20 00:00:00 , DOI: 10.1021/acsami.7b18815 Yanyan Gao 1 , Jianping Xu 1 , Shaobo Shi 2 , Hong Dong 3 , Yahui Cheng 3 , Chengtai Wei 1 , Xiaosong Zhang 1 , Shougen Yin 1 , Lan Li 1
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The self-powered ultraviolet photodetectors (UV PDs) have attracted increasing attention due to their potential applications without consuming any external power. It is important to obtain the high-performance self-powered UV PDs by a simple method for the practical application. Herein, TiO2 nanorod arrays (NRs) were synthesized by hydrothermal method, which were integrated with p-type NiO nanoflakes to realize a high performance pn heterojunction for the efficient UV photodetection. TiOx thin film can improve the morphological and carrier transport properties of TiO2 NRs and decrease the surface and defect states, resulting in the enhanced photocurrent of the devices. NiO/TiO2 nanostructural heterojunctions show excellent rectifying characteristics (rectification ratio of 2.52 × 104 and 1.45 × 105 for NiO/TiO2 NRs and NiO/TiO2 NRs/TiOx, respectively) with a very low reverse saturation current. The PDs based on the heterojunctions exhibit good spectral selectivity, high photoresponsivity, and fast response and recovery speeds without external applied bias under the weak light radiation. The devices demonstrate good stability and repeatability under UV light radiation. The self-powered performance could be attributed to the proper built-in electric field of the heterojunction. TiO2 NRs and NiO nanoflakes construct the well-aligned energy-band structure. The enhanced responsivity and detectivity for the devices with TiOx thin films is related to the increased interfacial charge separation efficiency, reduced carrier recombination, and relatively good electron transport of TiO2 NRs.
中文翻译：
基于TiO 2纳米棒阵列的自供电紫外光电探测器：具有NiO纳米薄片和增强型UV光响应的异质结
自供电式紫外线光电探测器（UV PD）由于其潜在的应用而又不消耗任何外部电源，因此引起了越来越多的关注。对于实际应用而言，通过简单的方法获得高性能的自供电UV PD至关重要。本文中，通过水热法合成了TiO 2纳米棒阵列（NRs），将其与p型NiO纳米薄片集成在一起，以实现用于高效紫外光检测的高性能pn异质结。TiO x薄膜可以改善TiO 2 NRs的形貌和载流子传输性能，并降低表面和缺陷状态，从而提高了器件的光电流。NiO / TiO 2纳米结构异质结具有出色的整流特性（NiO / TiO 2 NRs和NiO / TiO 2 NRs / TiO x的整流比分别为2.52×10 4和1.45×10 5），反向饱和电流非常低。基于异质结的PD表现出良好的光谱选择性，高光响应性以及快速的响应和恢复速度，而在弱光辐射下没有外部施加的偏压。该器件在紫外线下显示出良好的稳定性和可重复性。自供电性能可归因于异质结的适当内置电场。二氧化钛2NR和NiO纳米薄片构成了排列良好的能带结构。带有TiO x薄膜的器件的响应性和检测性增强与TiO 2 NRs的界面电荷分离效率提高，载流子重组减少以及电子传输相对良好有关。
更新日期：2018-03-20
中文翻译：
基于TiO 2纳米棒阵列的自供电紫外光电探测器：具有NiO纳米薄片和增强型UV光响应的异质结
自供电式紫外线光电探测器（UV PD）由于其潜在的应用而又不消耗任何外部电源，因此引起了越来越多的关注。对于实际应用而言，通过简单的方法获得高性能的自供电UV PD至关重要。本文中，通过水热法合成了TiO 2纳米棒阵列（NRs），将其与p型NiO纳米薄片集成在一起，以实现用于高效紫外光检测的高性能pn异质结。TiO x薄膜可以改善TiO 2 NRs的形貌和载流子传输性能，并降低表面和缺陷状态，从而提高了器件的光电流。NiO / TiO 2纳米结构异质结具有出色的整流特性（NiO / TiO 2 NRs和NiO / TiO 2 NRs / TiO x的整流比分别为2.52×10 4和1.45×10 5），反向饱和电流非常低。基于异质结的PD表现出良好的光谱选择性，高光响应性以及快速的响应和恢复速度，而在弱光辐射下没有外部施加的偏压。该器件在紫外线下显示出良好的稳定性和可重复性。自供电性能可归因于异质结的适当内置电场。二氧化钛2NR和NiO纳米薄片构成了排列良好的能带结构。带有TiO x薄膜的器件的响应性和检测性增强与TiO 2 NRs的界面电荷分离效率提高，载流子重组减少以及电子传输相对良好有关。
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