1. Space-confined solid-phase growth of two-domain 1T'-ReSe2 for tunable optoelectronics
- Author
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Tong, Yunhao, Kong, Fanyi, Zhang, Lei, Hou, Xinyi, Zha, Zhengxian, Hao, Zheng, Dai, Jianxun, Sun, Changsen, Song, Jingfeng, Huang, Huolin, Ji, Chenhua, Pan, Lujun, and Li, Dawei
- Subjects
Physics - Optics ,Condensed Matter - Materials Science - Abstract
Two-dimensional layered ReX2 (X = Se, S) has attracted researcher's great interest due to its unusual in-plane anisotropic optical and electrical properties and great potential in polarization-sensitive optoelectronic devices, while the clean, energy-saving, and ecological synthesis of highly-crystalline ReSe2 with controlled domains remains challenging yet promising. Here, we develop a novel space-confined solid-phase approach for the growth of high-quality two-domain 1T'-ReSe2 with tunable optoelectronic properties by using pure Re powder film as Re precursor. The results show that ReSe2 can be grown at a temperature as low as 550 oC in a small-tube-assisted space-confined reactor, with its size and shape well-tailored via temperature control. A solid-phase two-domain ReSe2 growth mechanism is proposed, as evidenced by combining in-situ optical monitoring, ex-situ electron microscope and elemental mapping, and polarized optical imaging. Moreover, we have fabricated two-domain ReSe2 transistors, which exhibit switchable transport behavior between n-type and ambipolar character via grain boundary orientation control. This modulation phenomenon is attributed to the different doping levels between the grain boundary and the single domain. Furthermore, the as-fabricated two-domain ReSe2 photodetectors exhibit a highly gate-tunable current on-off ratio (with a maximum value of ~8.2x10^3), a polarization-sensitive photo-response, and a high-speed response time (~300 us), exceeding most of the previously reported ReX2 photodetectors. Our work thus provides a new, low-consumption, energy-saving growth strategy toward high-quality, domain-controlled ReX2 for highly tunable and high-performance optoelectronics., Comment: 24 pages, 6 figures
- Published
- 2023