Enhanced Photoresponse in MoTe2 Photodetectors with Asymmetric Graphene Contacts
Source abstract
Abstract
Abstract Atomically thin 2D materials are promising candidates for miniaturized high‐performance optoelectronic devices. This study reports on multilayer MoTe2 photodetectors contacted with asymmetric electrodes based on n‐ and p‐type graphene layers. The asymmetry in the graphene contacts creates a large (Ebi ∼ 100 kV cm−1) built‐in electric field across the short (l = 15 nm) MoTe2 channel, causing a high and broad (λ = 400–1400 nm) photoresponse even without any externally applied voltage. Spatially resolved photovoltage maps reveal an enhanced photoresponse and larger built‐in electric field in regions of the MoTe2 layer between the two graphene contacts. Furthermore, a fast (∼10 µs) photoresponse is achieved in both the photovoltaic and photoconductive operation modes of the junction. The findings can be extended to other 2D materials and offer prospects for the implementation of asymmetric graphene contacts in future low‐power optoelectronic applications.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: 2D Materials and Applications · Graphene research and applications · Advanced Thermoelectric Materials and Devices
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 P. R. China
Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 P. R. China
State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China
School of Physics and Astronomy University of Nottingham Nottingham NG7 2RD UK
Center for Excellence in Topological Quantum Computation University of Chinese Academy of Science Beijing 100049 P. R. China
Funding
National Natural Science Foundation of China · Engineering and Physical Sciences Research Council · Chinese Academy of Sciences
References (54)
Show source-provided references
1. 10.1002/smll.20170026810.1002/smll.201700268 ↗
2. 10.1039/C5CS00106D10.1039/C5CS00106D ↗
3. 10.3390/app603007810.3390/app6030078 ↗
4. 10.1038/nphoton.2015.28210.1038/nphoton.2015.282 ↗
5. 10.1021/nl502557g10.1021/nl502557g ↗
6. 10.1021/nl504500710.1021/nl5045007 ↗
7. 10.1088/2053-1583/1/2/02100210.1088/2053-1583/1/2/021002 ↗
8. 10.1039/C6RA18238K10.1039/C6RA18238K ↗
9. 10.1088/0957-4484/27/44/44520110.1088/0957-4484/27/44/445201 ↗
10. 10.1002/smtd.20170034910.1002/smtd.201700349 ↗
11. 10.1088/0022-3719/12/5/01710.1088/0022-3719/12/5/017 ↗
12. 10.1038/nnano.2014.21510.1038/nnano.2014.215 ↗
13. 10.1021/acsnano.6b0098010.1021/acsnano.6b00980 ↗
14. 10.1021/acsnano.8b0493110.1021/acsnano.8b04931 ↗
15. 10.1088/2053-1583/aa89fc10.1088/2053-1583/aa89fc ↗
16. 10.1002/adfm.20180295410.1002/adfm.201802954 ↗
17. 10.1088/1361-6528/aada6810.1088/1361-6528/aada68 ↗
18. 10.1021/acsnano.6b0184210.1021/acsnano.6b01842 ↗
19. 10.1038/nphoton.2010.4010.1038/nphoton.2010.40 ↗
20. 10.1088/1674-4926/37/1/01500110.1088/1674-4926/37/1/015001 ↗
21. 10.1021/acsnano.5b0235610.1021/acsnano.5b02356 ↗
22. 10.1002/adma.20150088910.1002/adma.201500889 ↗
23. 10.1088/0957-4484/23/11/11200110.1088/0957-4484/23/11/112001 ↗
24. 10.1002/adma.20110030410.1002/adma.201100304 ↗
25. 10.1002/adma.20100106810.1002/adma.201001068 ↗
26. 10.1186/s11671-017-2373-510.1186/s11671-017-2373-5 ↗
27. 10.1002/aelm.20150034610.1002/aelm.201500346 ↗
28. 10.1002/smll.20170206610.1002/smll.201702066 ↗
29. 10.1038/nnano.2014.3110.1038/nnano.2014.31 ↗
30. 10.1039/C7NR03445H10.1039/C7NR03445H ↗
31. 10.1002/adma.20150409010.1002/adma.201504090 ↗
32. 10.1088/2053-1583/1/1/01100210.1088/2053-1583/1/1/011002 ↗
33. 10.1088/1361-6528/aa749e10.1088/1361-6528/aa749e ↗
34. 10.1103/PhysRevLett.97.18740110.1103/PhysRevLett.97.187401 ↗
35. 10.1103/PhysRevB.77.24540810.1103/PhysRevB.77.245408 ↗
36. 10.1016/j.physrep.2009.02.00310.1016/j.physrep.2009.02.003 ↗
37. 10.1021/acs.nanolett.5b0252310.1021/acs.nanolett.5b02523 ↗
38. 10.1364/OME.7.00058710.1364/OME.7.000587 ↗
39. 10.1039/C7NR03124F10.1039/C7NR03124F ↗
40. 10.1021/acsnano.5b0559610.1021/acsnano.5b05596 ↗
41. 10.1021/acsami.6b1448310.1021/acsami.6b14483 ↗
42. 10.1021/acsnano.5b0266510.1021/acsnano.5b02665 ↗
43. 10.1080/0001873690010130710.1080/00018736900101307 ↗
44. 10.1038/nnano.2013.20610.1038/nnano.2013.206 ↗
45. 10.1063/1.495315210.1063/1.4953152 ↗
46. 10.1088/2053-1583/aaa72110.1088/2053-1583/aaa721 ↗
47. 10.1039/C8TC01237G10.1039/C8TC01237G ↗
48. 10.1002/adom.20170049010.1002/adom.201700490 ↗
49. 10.1063/1.494199610.1063/1.4941996 ↗
50. 10.1002/adma.20180565610.1002/adma.201805656 ↗
51. 10.1002/smll.20170329310.1002/smll.201703293 ↗
52. 10.1002/adfm.20180549110.1002/adfm.201805491 ↗
53. 10.1038/ncomms293510.1038/ncomms2935 ↗
54. 10.1002/adma.20110212210.1002/adma.201102122 ↗