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Edelberg D, Rhodes D, Kerelsky A, Kim B, Wang J, Zangiabadi A, Kim C, Abhinandan A, Ardelean J, Scully M, Scullion D, Embon L, Zu R, Santos EJG, Balicas L, Marianetti C, Barmak K, Zhu X, Hone J, Pasupathy AN. Approaching the Intrinsic Limit in Transition Metal Diselenides via Point Defect Control. Nano Lett 2019; 19:4371-4379. [PMID: 31180688 DOI: 10.1021/acs.nanolett.9b00985] [Citation(s) in RCA: 77] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Two dimensional (2D) transition-metal dichalcogenide (TMD) based semiconductors have generated intense recent interest due to their novel optical and electronic properties and potential for applications. In this work, we characterize the atomic and electronic nature of intrinsic point defects found in single crystals of these materials synthesized by two different methods, chemical vapor transport and self-flux growth. Using a combination of scanning tunneling microscopy (STM) and scanning transmission electron microscopy (STEM), we show that the two major intrinsic defects in these materials are metal vacancies and chalcogen antisites. We show that by control of the synthetic conditions, we can reduce the defect concentration from above 1013/cm2 to below 1011/cm2. Because these point defects act as centers for nonradiative recombination of excitons, this improvement in material quality leads to a hundred-fold increase in the radiative recombination efficiency.
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Affiliation(s)
| | | | | | | | | | - Amirali Zangiabadi
- National High Magnetic Field Laboratory , Florida State University , Tallahassee , Florida 32310 , United States
| | - Chanul Kim
- National High Magnetic Field Laboratory , Florida State University , Tallahassee , Florida 32310 , United States
| | | | | | - Micheal Scully
- School of Mathematics and Physics , Queen's University , Belfast , BT7 1NN , United Kingdom
| | - Declan Scullion
- School of Mathematics and Physics , Queen's University , Belfast , BT7 1NN , United Kingdom
| | | | - Rui Zu
- National High Magnetic Field Laboratory , Florida State University , Tallahassee , Florida 32310 , United States
| | - Elton J G Santos
- School of Mathematics and Physics , Queen's University , Belfast , BT7 1NN , United Kingdom
| | - Luis Balicas
- National High Magnetic Field Laboratory , Florida State University , Tallahassee , Florida 32310 , United States
- Department of Physics , Florida State University , Tallahassee , Florida 32306 , United States
| | - Chris Marianetti
- Department of Applied Physics and Applied Math , Columbia University , New York , New York 10027 , United States
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