Band-like transport in small-molecule thin films toward high mobility and ultrahigh detectivity phototransistor arrays
Band-like transport in small-molecule thin films toward high mobility and ultrahigh detectivity phototransistor arrays
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DOI：
10.1038/s41467-018-07943-y
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发表时间：
2019-01-02
影响因子：
16.6
通讯作者：
Fuchs, Harald
中科院分区：
文献类型：
--
作者：
Ji, Deyang;Li, Tao;Fuchs, Harald
随着有机电子学的快速发展，有机半导体在各种光电应用中得到了广泛的研究，其中有机光电晶体管最近成为最有前途的光信号探测器之一。然而，赋予有机光电晶体管同时具有高迁移率和高光敏度仍然是一个巨大的挑战，因为大多数有机光响应材料的低迁移率限制了载流子的传输和收集效率。我们在此报告了用于有机光电晶体管阵列的真空沉积小分子薄膜中的带状电荷传输，该阵列可以在非常低的暗电流（类似于 10(-12) A）下工作。实现了高迁移率和优异的光学品质，包括光敏性、光响应性和探测率，其中前所未有地获得了大于10(17)cm Hz(1/2)W-1的探测率。所有这些关键参数均优于最先进的有机光电晶体管，这意味着光电应用的巨大潜力。
With the fast development of organic electronics, organic semiconductors have been extensively studied for various optoelectronic applications, among which organic phototransistors recently emerged as one of the most promising light signal detectors. However, it is still a big challenge to endow organic phototransistors with both high mobility and high light-sensitivity because the low mobility of most organic photoresponsive materials limits the efficiency of transporting and collecting charge carriers. We herein report band-like charge transport in vacuum-deposited small-molecule thin films for organic phototransistor arrays which can be operated at very low dark currents (similar to 10(-12) A). Both high mobility and excellent optical figures of merit including photosensitivity, photoresponsivity and detectivity are achieved, wherein, unprecedentedly, a detectivity greater than 10(17) cm Hz(1/2) W-1 is obtained. All these key parameters are superior to state-of-the-art organic phototransistors, implying a great potential in optoelectronic applications.