Broadband, High-Sensitivity Graphene Photodetector Based on Ferroelectric Polarization of Lithium Niobate
Broadband, High-Sensitivity Graphene Photodetector Based on Ferroelectric Polarization of Lithium Niobate
复制标题
基于铌酸锂铁电极化的宽带、高灵敏度石墨烯光电探测器
DOI：
10.1002/adom.202100245
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发表时间：
2021-06-01
影响因子：
9
通讯作者：
Zhang, Han
中科院分区：
文献类型：
--
作者：
Guan, Heyuan;Hong, Jiyu;Zhang, Han
二维石墨烯具有优异的光电性能，是一种很有前途的高性能光电探测器候选材料，受到了广泛的关注。然而，实现高灵敏度的宽带石墨烯光电探测器仍然是一个挑战。LiNbO_3具有自发极化、高介电常数、高电压电系数等优点，通过极化掺杂可以改善石墨烯的光电检测性能。在本工作中，借助于x切LiNbO_3的局域铁电极化，同时证明了石墨烯的n掺杂和p掺杂。这种高灵敏度的宽带p-n结光探测器具有405-2000 nm的宽探测范围，在24pW(波长=1064 nm)的入射功率下，响应率约为2.92×10(6)A W-1，高探测率约为8.65×10(14)琼斯。具体地，实现了接近23ms/接近23ms的快速上升/衰减时间。基于石墨烯的LiNbO_3(体相)光电探测器具有更高的响应度，而基于石墨烯的LiNbO_3(薄膜)光电探测器具有更快的响应时间。这项工作不仅深化和拓展了二维材料和铁电材料的基础研究，而且展示了掺杂石墨烯材料在高性能光检测方面的巨大潜力。
2D graphene has attracted extensive attention as a promising candidate for high-performance photodetectors because of its superior optoelectronic properties. However, the realization of high-sensitivity broadband graphene photodetectors remains a challenge. Lithium niobate (LiNbO3) has the advantages of spontaneous polarization, high dielectric constant, and high voltage electric coefficient, and it can improve the photoelectric detection characteristics of graphene by polarized doping. In this work, n- and p-doping of graphene is demonstrated at the same time with the help of local ferroelectric polarization of x-cut LiNbO3. This high-sensitivity and broadband p-n junction photodetector shows a wide detection range of 405 to 2000 nm, a responsivity of approximate to 2.92 x 10(6) A W-1 at an incident power of 24 pW (lambda = 1064 nm), and a high detectivity of approximate to 8.65 x 10(14) Jones. In particular, a fast rise/decay time of approximate to 23 ms/approximate to 23 ms is achieved. The graphene-based LiNbO3 (bulk) photodetector shows higher responsivity , and the graphene-based LiNbO3 (film) photodetector a faster response time. This work not only deepens and expands the basic research on 2D materials and ferroelectric materials, but also demonstrates the great potential of doped graphene materials for high-performance photodetection.