Applications of Few-Layer Nb2C MXene: Narrow-Band Photodetectors and Femtosecond Mode-Locked Fiber Lasers
Applications of Few-Layer Nb2C MXene: Narrow-Band Photodetectors and Femtosecond Mode-Locked Fiber Lasers
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DOI：
10.1021/acsnano.0c07608
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发表时间：
2021-01-15
期刊：
影响因子：
17.1
通讯作者：
Agren, Hans
中科院分区：
文献类型：
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作者：
Gao, Lingfeng;Ma, Chunyang;Agren, Hans
尽管碳化铌（Nb2C）的物理化学性质已被广泛研究，但其在光电子领域的探索仍处于起步阶段，许多潜在应用仍有待开发。因此，这里证明了少层 Nb2C MXene 可以作为光电化学型光电探测器 (PD) 和锁模器的出色构建模块。我们表明，光响应性能可以很容易地通过外部条件进行调整，并且 Nb2C NS 在窄带 PD 方面表现出巨大的潜力。密度泛函理论计算预测的功函数进一步证实了所证明的机制。此外，作为被动锁模光纤激光器的光开关，Nb2C MXene可以在电信和中红外区域展示超稳定脉冲，并且可以在1882 nm中心波长处实现高达411 MHz的69次谐波。这些有趣的结果表明，少层 Nb2C 纳米片可以用作各种光电器件的构建块，进一步拓宽了二维 MXene 的应用前景。
Although the physicochemical properties of niobium carbide (Nb2C) have been widely investigated, their exploration in the field of photoelectronics is still at the infancy stage with many potential applications that remain to be exploited. Hence, it is demonstrated here that few-layer Nb2C MXene can serve as an excellent building block for both photoelectrochemical-type photodetectors (PDs) and mode-lockers. We show that the photoresponse performance can be readily adjusted by external conditions and that Nb2C NSs exhibit a great potential for narrow-band PDs. The demonstrated mechanism was further confirmed by work functions predicted by density functional theory calculations. In addition, as an optical switch for passively mode-locked fiber lasers, ultrastable pulses can be demonstrated in the telecommunication and mid-infrared regions for Nb2C MXene, and as high as the 69th harmonic order with 411 MHz at the center wavelength of 1882 nm can be achieved. These intriguing results indicate that few-layer Nb2C nanosheets can be used as building blocks for various photoelectronic devices, further broadening the application prospects of two-dimensional MXenes.