Extremely Efficient Photocurrent Generation in Carbon Nanotube Photodiodes Enabled by a Strong Axial Electric Field
Extremely Efficient Photocurrent Generation in Carbon Nanotube Photodiodes Enabled by a Strong Axial Electric Field
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DOI：
10.1021/acs.nanolett.9b04151
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发表时间：
2020-01-01
期刊：
影响因子：
10.8
通讯作者：
Minot, Ethan D.
中科院分区：
文献类型：
--
作者：
McCuley, Daniel R.;Senger, Mitchell J.;Minot, Ethan D.
碳纳米管（CNT）光电二极管具有将光高效转换为电流的潜力。然而，先前的实验已经揭示了光电流量子产率（PCQY）远低于100%。在这项工作中，我们表明，轴向电场增加的碳纳米管光电二极管的PCQY。在最佳条件下，我们的数据表明PCQY > 100%。我们研究了，实验和理论，CNT光电二极管在室温下使用相应的S-22，S-33，和S-44激子共振的光激发。pn结内的轴向电场控制使用分裂的栅极是电容耦合到悬浮的CNT。我们的研究结果提供了新的洞察光电流产生的途径，在碳纳米管和场的依赖性和直径依赖的PCQY。
Carbon nanotube (CNT) photodiodes have the potential to convert light into electrical current with high efficiency. However, previous experiments have revealed the photocurrent quantum yield (PCQY) to be well below 100%. In this work, we show that the axial electric field increases the PCQY of CNT photodiodes. Under optimal conditions, our data suggest PCQY > 100%. We studied, both experimentally and theoretically, CNT photodiodes at room temperature using optical excitation corresponding to the S-22, S-33, and S-44 exciton resonances. The axial electric field inside the pn junction was controlled using split gates that are capacitively coupled to the suspended CNT. Our results give new insight into the photocurrent generation pathways in CNTs and the field dependence and diameter dependence of PCQY.