Broadband Photovoltaic Detectors Based on an Atomically Thin Heterostructure

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• 作者：Mingsheng Long ; Erfu Liu ; Peng Wang ; Anyuan Gao ; Hui Xia ; Wei Luo ; Baigeng Wang ; Junwen Zeng ; Yajun Fu ; Kang Xu ; Wei Zhou ; Yangyang Lv ; Shuhua Yao ; Minghui Lu ; Yanfeng Chen ; Zhenhua Ni ; Yumeng You ; Xueao Zhang ; Shiqiao Qin ; Yi Shi ; Weida Hu ; Dingyu Xing ; Feng Miao
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：April 13, 2016
• 年：2016
• 卷：16
• 期：4
• 页码：2254-2259
• 全文大小：420K
• 年卷期：0
• ISSN：1530-6992

文摘

van der Waals junctions of two-dimensional materials with an atomically sharp interface open up unprecedented opportunities to design and study functional heterostructures. Semiconducting transition metal dichalcogenides have shown tremendous potential for future applications due to their unique electronic properties and strong light–matter interaction. However, many important optoelectronic applications, such as broadband photodetection, are severely hindered by their limited spectral range and reduced light absorption. Here, we present a p–g–n heterostructure formed by sandwiching graphene with a gapless band structure and wide absorption spectrum in an atomically thin p–n junction to overcome these major limitations. We have successfully demonstrated a MoS₂–graphene–WSe₂ heterostructure for broadband photodetection in the visible to short-wavelength infrared range at room temperature that exhibits competitive device performance, including a specific detectivity of up to 10¹¹ Jones in the near-infrared region. Our results pave the way toward the implementation of atomically thin heterostructures for broadband and sensitive optoelectronic applications.