Suspended few-layer GaS photodetector with sensitive fast response
The layered GaS has attracted much attention in the field of photodetection recently because of its considerable responsivity (∼A/W) caused by the high quantum yields, while its slow response speed (∼ms) due to the low carrier mobility limits its practical applications. Here, by separating a few-lay...
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2021
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oai:doaj.org-article:6b4fe76202ae4885aa8fa5597fae990a2021-11-12T04:24:45ZSuspended few-layer GaS photodetector with sensitive fast response0264-127510.1016/j.matdes.2021.110233https://doaj.org/article/6b4fe76202ae4885aa8fa5597fae990a2021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0264127521007887https://doaj.org/toc/0264-1275The layered GaS has attracted much attention in the field of photodetection recently because of its considerable responsivity (∼A/W) caused by the high quantum yields, while its slow response speed (∼ms) due to the low carrier mobility limits its practical applications. Here, by separating a few-layered GaS (∼15 nm) with its substrate to prepare a device with the typical suspended architecture, we trade off its responsivity with speed for the first time. A responsivity of ∼ 103 A/W and a switch time of ∼ μs are achieved simultaneously in a wide UV–vis range (300–628 nm), which exceeds that of the most current 2D material-based photodetectors. The excellent mechanical stiffness of layered GaS avoids the interface scattering and trap caused by the contacting with substrate or its own deformation. This is beneficial to the significant improvement of carrier mobility and fully activating the intrinsic properties of GaS. Combined with the comparative experiments and band theory analysis, this assertion is confirmed and the photoconductance effect is determined to play a dominant role. These results show a promising strategy for improving the performance of GaS photodetector, especially providing references for its future integrated devices.Weiheng ZhongYuqing LiuXuhui YangCong WangWei XinYuanzheng LiWeizhen LiuHaiyang XuElsevierarticleGaSSuspended photodetectorHigh responsivityFast response speedPhotoconductance effectMaterials of engineering and construction. Mechanics of materialsTA401-492ENMaterials & Design, Vol 212, Iss , Pp 110233- (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
GaS Suspended photodetector High responsivity Fast response speed Photoconductance effect Materials of engineering and construction. Mechanics of materials TA401-492 |
| spellingShingle |
GaS Suspended photodetector High responsivity Fast response speed Photoconductance effect Materials of engineering and construction. Mechanics of materials TA401-492 Weiheng Zhong Yuqing Liu Xuhui Yang Cong Wang Wei Xin Yuanzheng Li Weizhen Liu Haiyang Xu Suspended few-layer GaS photodetector with sensitive fast response |
| description |
The layered GaS has attracted much attention in the field of photodetection recently because of its considerable responsivity (∼A/W) caused by the high quantum yields, while its slow response speed (∼ms) due to the low carrier mobility limits its practical applications. Here, by separating a few-layered GaS (∼15 nm) with its substrate to prepare a device with the typical suspended architecture, we trade off its responsivity with speed for the first time. A responsivity of ∼ 103 A/W and a switch time of ∼ μs are achieved simultaneously in a wide UV–vis range (300–628 nm), which exceeds that of the most current 2D material-based photodetectors. The excellent mechanical stiffness of layered GaS avoids the interface scattering and trap caused by the contacting with substrate or its own deformation. This is beneficial to the significant improvement of carrier mobility and fully activating the intrinsic properties of GaS. Combined with the comparative experiments and band theory analysis, this assertion is confirmed and the photoconductance effect is determined to play a dominant role. These results show a promising strategy for improving the performance of GaS photodetector, especially providing references for its future integrated devices. |
| format |
article |
| author |
Weiheng Zhong Yuqing Liu Xuhui Yang Cong Wang Wei Xin Yuanzheng Li Weizhen Liu Haiyang Xu |
| author_facet |
Weiheng Zhong Yuqing Liu Xuhui Yang Cong Wang Wei Xin Yuanzheng Li Weizhen Liu Haiyang Xu |
| author_sort |
Weiheng Zhong |
| title |
Suspended few-layer GaS photodetector with sensitive fast response |
| title_short |
Suspended few-layer GaS photodetector with sensitive fast response |
| title_full |
Suspended few-layer GaS photodetector with sensitive fast response |
| title_fullStr |
Suspended few-layer GaS photodetector with sensitive fast response |
| title_full_unstemmed |
Suspended few-layer GaS photodetector with sensitive fast response |
| title_sort |
suspended few-layer gas photodetector with sensitive fast response |
| publisher |
Elsevier |
| publishDate |
2021 |
| url |
https://doaj.org/article/6b4fe76202ae4885aa8fa5597fae990a |
| work_keys_str_mv |
AT weihengzhong suspendedfewlayergasphotodetectorwithsensitivefastresponse AT yuqingliu suspendedfewlayergasphotodetectorwithsensitivefastresponse AT xuhuiyang suspendedfewlayergasphotodetectorwithsensitivefastresponse AT congwang suspendedfewlayergasphotodetectorwithsensitivefastresponse AT weixin suspendedfewlayergasphotodetectorwithsensitivefastresponse AT yuanzhengli suspendedfewlayergasphotodetectorwithsensitivefastresponse AT weizhenliu suspendedfewlayergasphotodetectorwithsensitivefastresponse AT haiyangxu suspendedfewlayergasphotodetectorwithsensitivefastresponse |
| _version_ |
1718431295238832128 |