Abstract
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.
Highlights
The discovery of two-dimensional (2D) materials offers new possibilities for the development of electronic devices [1,2]
Mo2C crystals and Mo2C—Gr were synthesized by an ambient pressure chemical vapor deposition (CVD) system
Methane and hydrogen were pumped into the CVD system as the carbon precursor and gas reducer, respectively
Summary
The discovery of two-dimensional (2D) materials offers new possibilities for the development of electronic devices [1,2]. 2D materials represented by graphene are widely used as electrodes in optoelectronic devices because of their unique structures and unusual mechanical, electronic and optical properties [3,4,5,6]. (for example, Ti2 C3 Tx , Mo2 CTx ) were synthesized by chemically etching layered ternary transition metal-containing phases [9,10]. MCene-based films are considered to be good electrodes and have been used in many devices such as metal ion batteries [11], supercapacitors [12], and field effect transistors [13]. The lateral size of MCene nanosheets synthesized by the chemically etching method often ranges from 0.1 to 10 μm [9,10]. Surface-terminating functional groups exist on the MCene surface, leading to its thermal instability [16]
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