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Two-Dimensional Cs2AgBiBr6/WS2 Heterostructure-Based Photodetector with Boosted Detectivity via Interfacial Engineering
ACS Nano ( IF 15.8 ) Pub Date : 2022-02-18 , DOI: 10.1021/acsnano.1c09513 Feier Fang 1 , Yi Wan 2, 3 , Henan Li 1 , Shaofan Fang 1 , Fu Huang 1 , Bo Zhou 1 , Ke Jiang 4 , Vincent Tung 3 , Lain-Jong Li 2 , Yumeng Shi 1
ACS Nano ( IF 15.8 ) Pub Date : 2022-02-18 , DOI: 10.1021/acsnano.1c09513 Feier Fang 1 , Yi Wan 2, 3 , Henan Li 1 , Shaofan Fang 1 , Fu Huang 1 , Bo Zhou 1 , Ke Jiang 4 , Vincent Tung 3 , Lain-Jong Li 2 , Yumeng Shi 1
Affiliation
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Two-dimensional (2D) transition metal dichalcogenide (TMDC) monolayers have been widely used for optoelectronic devices because of their ultrasensitivity to light detection acquired from their direct gap properties. However, the small cross-section of photon absorption in the atomically thin layer thickness significantly limits the generation of photocarriers, restricting their performance. Here, we integrate monolayer WS2 with 2D perovskites Cs2AgBiBr6, which serve as the light absorption layer, to greatly enhance the photosensitivity of WS2. The efficient charge transfer at the Cs2AgBiBr6/WS2 heterojunction is evidenced by the shortened photoluminescence (PL) decay time of Cs2AgBiBr6. Scanning photocurrent microscopy of Cs2AgBiBr6/WS2/graphene reveals that improved charge extraction from graphene leads to an enhanced photoresponse. The 2D Cs2AgBiBr6/WS2/graphene vertical heterostructure photodetector exhibits a high detectivity (D*) of 1.5 × 1013 Jones with a fast response time of 52.3 μs/53.6 μs and an on/off ratio of 1.02 × 104. It is worth noting that this 2D heterostructure photodetector can realize self-powered light detection behavior with an open-circuit voltage of ∼0.75 V. The results suggest that the 2D perovskites can effectively improve the TMDC layer-based photodetectors for low-power consumption photoelectrical applications.
中文翻译：
通过界面工程提高检测率的二维 Cs2AgBiBr6/WS2 异质结构光电探测器
二维 (2D) 过渡金属二硫属化物 (TMDC) 单分子层因其直接间隙特性对光检测的超灵敏性而被广泛用于光电器件。然而，原子薄层厚度中光子吸收的小横截面显着限制了光载流子的产生，限制了它们的性能。在这里，我们将单层WS 2与作为光吸收层的二维钙钛矿Cs 2 AgBiBr 6集成在一起，以大大提高WS 2的光敏性。Cs 2 AgBiBr 6 /WS 2处的有效电荷转移Cs 2 AgBiBr 6缩短的光致发光（PL）衰减时间证明了异质结。Cs 2 AgBiBr 6 /WS 2 /石墨烯的扫描光电流显微术表明，改进的石墨烯电荷提取导致增强的光响应。二维 Cs 2 AgBiBr 6 /WS 2 /石墨烯垂直异质结构光电探测器具有1.5 × 10 13 Jones 的高探测率 ( D *)，快速响应时间为 52.3 μs/53.6 μs，开/关比为 1.02 × 10 4. 值得注意的是，这种二维异质结构光电探测器可以在~0.75 V的开路电压下实现自供电光探测行为。结果表明，二维钙钛矿可以有效改善基于TMDC层的光电探测器，用于低功耗光电应用程序。
更新日期：2022-02-18
中文翻译：
通过界面工程提高检测率的二维 Cs2AgBiBr6/WS2 异质结构光电探测器
二维 (2D) 过渡金属二硫属化物 (TMDC) 单分子层因其直接间隙特性对光检测的超灵敏性而被广泛用于光电器件。然而，原子薄层厚度中光子吸收的小横截面显着限制了光载流子的产生，限制了它们的性能。在这里，我们将单层WS 2与作为光吸收层的二维钙钛矿Cs 2 AgBiBr 6集成在一起，以大大提高WS 2的光敏性。Cs 2 AgBiBr 6 /WS 2处的有效电荷转移Cs 2 AgBiBr 6缩短的光致发光（PL）衰减时间证明了异质结。Cs 2 AgBiBr 6 /WS 2 /石墨烯的扫描光电流显微术表明，改进的石墨烯电荷提取导致增强的光响应。二维 Cs 2 AgBiBr 6 /WS 2 /石墨烯垂直异质结构光电探测器具有1.5 × 10 13 Jones 的高探测率 ( D *)，快速响应时间为 52.3 μs/53.6 μs，开/关比为 1.02 × 10 4. 值得注意的是，这种二维异质结构光电探测器可以在~0.75 V的开路电压下实现自供电光探测行为。结果表明，二维钙钛矿可以有效改善基于TMDC层的光电探测器，用于低功耗光电应用程序。
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