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首页> 外文期刊>Nanotechnology >Significantly enhanced photoresponse in carbon nanotube film/TiO_2 nanotube array heterojunctions by pre-electroforming
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Significantly enhanced photoresponse in carbon nanotube film/TiO_2 nanotube array heterojunctions by pre-electroforming

机译：通过预电铸显着增强碳纳米管膜/ TiO_2纳米管阵列异质结中的光响应

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摘要

Traditional TiO_2 based photodetectors (PDs) suffer from high dark resistance, which increases loss of photoexcited charge carriers. Here, we report a new and simple way to improve the performance of PDs based on double-walled carbon nanotube (DWCNT)/TiO_2 nanotube heterojunctions. Highly ordered TiO_2 nanotube arrays were fabricated using a two-step anodic oxidation method, and coated with a DWCNT film, which functioned as a semitransparent electrode and a photoactive layer. Via pre-electroforming, the device was switched from a high resistance state (HRS) to a low resistance state (LRS). At an applied bias of 1 V, the dark resistance was reduced from 926 to 0.67 kΩ, as a result of the formation of oxygen vacancy related conducting filaments. The photoresponse (ΔI = I_p - I_d, where I_p and I_d represents photocurrent and dark current, respectively) of the PD in LRS reached 816.76 μA W~(-1) under 532 nm laser illumination and 802.89 μA W~(-1) under 1064 nm laser irradiation, which is 965 and 3980 times higher, respectively, than those obtained from the HRS device under the same conditions. This strategy for enhancing the photoresponse of TiO_2 based PDs may have applications in further improving the power conversion efficiency of dye-sensitized solar cells.
机译：传统的基于TiO_2的光电探测器（PD）具有较高的耐暗性，这会增加光激发电荷载流子的损耗。在这里，我们报告了一种基于双壁碳纳米管/ TiO_2纳米管异质结的改善PD性能的新的简单方法。采用两步阳极氧化法制备了高度有序的TiO_2纳米管阵列，并涂覆了DWCNT膜，该膜起着半透明电极和光敏层的作用。通过预电铸，器件从高电阻状态（HRS）切换到低电阻状态（LRS）。在施加1 V偏压时，由于形成了与氧空位有关的导电丝，暗电阻从926降低到0.67kΩ。在532 nm激光照射下，LRS中PD的光响应（ΔI= I_p-I_d，其中I_p和I_d分别代表光电流和暗电流）在532 nm激光照射下达到816.76μAW〜（-1），在802.89μAW〜（-1）下在相同条件下，从HRS装置获得的1064 nm激光照射分别比从HRS装置获得的高1065 nm和3980倍。这种增强基于TiO_2的PD的光响应的策略可能在进一步提高染料敏化太阳能电池的功率转换效率方面具有应用价值。

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