Controlled Growth of an Mo2C—Graphene Hybrid Film as an Electrode in Self-Powered Two-Sided Mo2C—Graphene/Sb2S0.42Se2.58/TiO2 Photodetectors
Zhe Kang,
Zhi Zheng,
Helin Wei,
Zhi Zhang,
Xinyu Tan,
Lun Xiong,
Tianyou Zhai,
Yihua Gao
Affiliations
Zhe Kang
Wuhan National Laboratory for Optoelectronics (WNLO) & School of Physics & School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Center for Nanoscale Characterization & Devices (CNCD), LuoyuRoad 1037, Wuhan 430074, China
Zhi Zheng
Wuhan National Laboratory for Optoelectronics (WNLO) & School of Physics & School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Center for Nanoscale Characterization & Devices (CNCD), LuoyuRoad 1037, Wuhan 430074, China
Helin Wei
Wuhan National Laboratory for Optoelectronics (WNLO) & School of Physics & School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Center for Nanoscale Characterization & Devices (CNCD), LuoyuRoad 1037, Wuhan 430074, China
Zhi Zhang
Wuhan National Laboratory for Optoelectronics (WNLO) & School of Physics & School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Center for Nanoscale Characterization & Devices (CNCD), LuoyuRoad 1037, Wuhan 430074, China
Xinyu Tan
College of Materials and Chemical Engineering, China Three Gorges University, Daxue Road 8, Yichang 443002, China
Lun Xiong
Hubei Key Laboratory of Optical Information and Pattern Recognition, School of Optical Information and Energy Engineering, School of Mathematics and Physics, Wuhan Institute of Technology, Guanggu 1st Road 206, Wuhan 430205, China
Tianyou Zhai
Wuhan National Laboratory for Optoelectronics (WNLO) & School of Physics & School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Center for Nanoscale Characterization & Devices (CNCD), LuoyuRoad 1037, Wuhan 430074, China
Yihua Gao
Wuhan National Laboratory for Optoelectronics (WNLO) & School of Physics & School of Materials Science and Engineering, Huazhong University of Science and Technology (HUST), Center for Nanoscale Characterization & Devices (CNCD), LuoyuRoad 1037, Wuhan 430074, China
The monotonic work function of graphene makes it difficult to meet the electrode requirements of every device with different band structures. Two-dimensional (2D) transition metal carbides (TMCs), such as carbides in MXene, are considered good candidates for electrodes as a complement to graphene. Carbides in MXene have been used to make electrodes for use in devices such as lithium batteries. However, the small lateral size and thermal instability of carbides in MXene, synthesized by the chemically etching method, limit its application in optoelectronic devices. The chemical vapor deposition (CVD) method provides a new way to obtain high-quality ultrathin TMCs without functional groups. However, the TMCs film prepared by the CVD method tends to grow vertically during the growth process, which is disadvantageous for its application in the transparent electrode. Herein, we prepared an ultrathin Mo2C—graphene (Mo2C—Gr) hybrid film by CVD to solve the above problem. The work function of Mo2C—Gr is between that of graphene and a pure Mo2C film. The Mo2C—Gr hybrid film was selected as a transparent hole-transporting layer to fabricate novel Mo2C—Gr/Sb2S0.42Se2.58/TiO2 two-sided photodetectors. The Mo2C—Gr/Sb2S0.42Se2.58/TiO2/fluorine-doped tin oxide (FTO) device could detect light from both the FTO side and the Mo2C—Gr side. The device could realize a short response time (0.084 ms) and recovery time (0.100 ms). This work is believed to provide a powerful method for preparing Mo2C—graphene hybrid films and reveals its potential applications in optoelectronic devices.
