Ultrafast probes of electron-hole transitions between two atomic layers
文献类型：期刊论文
| 作者 | Wen, Xiewen1; Chen, Hailong2; Wu, Tianmin3; Yu, Zhihao4; Yang, Qirong4; Deng, Jingwen4; Liu, Zhengtang4; Guo, Xin4; Guan, Jianxin4; Zhang, Xiang1 |
| 刊名 | NATURE COMMUNICATIONS
 |
| 出版日期 | 2018-05-10 |
| 卷号 | 9 |
| ISSN号 | 2041-1723 |
| DOI | 10.1038/s41467-018-04291-9 |
| 英文摘要 | Phase transitions of electron-hole pairs on semiconductor/conductor interfaces determine fundamental properties of optoelectronics. To investigate interfacial dynamical transitions of charged quasiparticles, however, remains a grand challenge. By employing ultrafast mid-infrared microspectroscopic probes to detect excitonic internal quantum transitions and two-dimensional atomic device fabrications, we are able to directly monitor the interplay between free carriers and insulating interlayer excitons between two atomic layers. Our observations reveal unexpected ultrafast formation of tightly bound interlayer excitons between conducting graphene and semiconducting MoSe2. The result suggests carriers in the doped graphene are no longer massless, and an effective mass as small as one percent of free electron mass is sufficient to confine carriers within a 2D hetero space with energy 10 times larger than the room-temperature thermal energy. The interlayer excitons arise within 1 ps. Their formation effectively blocks charge recombination and improves charge separation efficiency for more than one order of magnitude. |
| 语种 | 英语 |
| 出版者 | NATURE PUBLISHING GROUP |
| WOS记录号 | WOS:000431772300001 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/43249]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Zhuang, Wei; Liu, Zhirong; Lou, Jun; Zheng, Junrong |
| 作者单位 | 1.Rice Univ, Dept Mat Sci & NanoEngn, 6100 Main St, Houston, TX 77005 USA 2.Chinese Acad Sci, Inst Phys, CAS Key Lab Soft Matter Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China 3.Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Anhui, Peoples R China 4.Peking Univ, Beijing Natl Lab Mol Sci, Coll Chem & Mol Engn, Beijing 100871, Peoples R China 5.Rice Univ, Dept Chem, 6100 Main St, Houston, TX 77005 USA 6.Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wen, Xiewen,Chen, Hailong,Wu, Tianmin,et al. Ultrafast probes of electron-hole transitions between two atomic layers[J]. NATURE COMMUNICATIONS,2018,9. |
| APA | Wen, Xiewen.,Chen, Hailong.,Wu, Tianmin.,Yu, Zhihao.,Yang, Qirong.,...&Zheng, Junrong.(2018).Ultrafast probes of electron-hole transitions between two atomic layers.NATURE COMMUNICATIONS,9. |
| MLA | Wen, Xiewen,et al."Ultrafast probes of electron-hole transitions between two atomic layers".NATURE COMMUNICATIONS 9(2018). |
入库方式： OAI收割
来源：化学研究所
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