High performance graphene/C60/Sb composite film phototransistor with broadband and tunable bidirectional photoresponse

Yuanlingyun Cai; Rui Pan; Yunqing Li; Xiong Li; Mingbo Pu; Xiangang Luo

doi:10.1117/12.3047969

13 December 2024 High performance graphene/C₆₀/Sb composite film phototransistor with broadband and tunable bidirectional photoresponse

Yuanlingyun Cai, Rui Pan, Yunqing Li, Xiong Li, Mingbo Pu, Xiangang Luo

Author Affiliations +

Proceedings Volume 13496, AOPC 2024: Optical Sensing, Imaging Technology, and Applications; 134960X (2024) https://doi.org/10.1117/12.3047969
Event: Applied Optics and Photonics China 2024 (AOPC2024), 2024, Beijing, China

Abstract

The high-performance phototransistor based on two-dimensional materials is very attractive in integrated logic function chips and large-scale real-time optical imaging. Recently, graphene-semiconductor composite film phototransistors have already achieved ultrahigh photoconductive gain due to the strong absorption capacity of the semiconductor layer and the strong mobility of graphene. However, low absorption and high dark current limit the photoresponsivity and detective band of the graphene phototransistors. Here, we fabricate a graphene/C₆₀/Sb composite film photo transistor with a broadband response (450 nm - 1500 nm), fast response speed (20 ms) and ultrahigh peak photoresponsivity (3.927 × 10⁵ A/W). The charge transfer mechanism between layers of the device has been analyzed by adjusting Sb layer thicknesses (5 nm, 10 nm, 20 nm). In addition, we observe the positive and negative photocurrent response in the experiment and study the bidirectional response of the device by applying different gate voltages. The ultrathin phototransistor (10 - 20 nm) is compatible with the traditional CMOS and nanoimprinting process to achieve large area and high-precision array integrated devices.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yuanlingyun Cai, Rui Pan, Yunqing Li, Xiong Li, Mingbo Pu, and Xiangang Luo "High performance graphene/C₆₀/Sb composite film phototransistor with broadband and tunable bidirectional photoresponse", Proc. SPIE 13496, AOPC 2024: Optical Sensing, Imaging Technology, and Applications, 134960X (13 December 2024); https://doi.org/10.1117/12.3047969

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