Effect of Lateral Size and Surface Passivation on the Near-Band-Edge Excitonic Emission from Quasi-Two-Dimensional CdSe Nanoplatelets

Yu，Jiahao1,2; Zhang，Chaojian1; Pang，Guotao1; Sun，Xiao Wei1; Chen，Rui1

2019

10.1021/acsami.9b16044

ACS Applied Materials & Interfaces   影响因子和分区

1944-8244

1944-8252

As a new type of quasi-two-dimensional nanomaterial, CdSe nanoplatelets (NPLs) possess excellent properties such as narrow emission peak, large absorption cross section, and a low threshold of amplified spontaneous emission. However, the origin of emission especially at low temperatures has not been studied clearly up till now. Here, we study the temperature-dependent photoluminescence of CdSe NPLs which show two emission peaks at low temperatures. It is interesting to note that the intensity of the low-energy peak shows a correlation with laser irradiation time. Moreover, the low-temperature PL spectra of four CdSe NPLs with different lateral sizes demonstrate the relationship of low-energy peaks with the surface. It has been confirmed that CdSe NPLs with larger surface areas to volume ratio have stronger low-energy emissions, which is ascribed to the surface-state-related emission. Finally, surface passivation of CdSe NPLs attenuates the intensity of the low-energy peak, which further verifies our model. Our results demonstrate the critical significance of surface in CdSe NPLs for their optical properties, which is crucial for the application of optoelectronic devices.

CdSe nanoplatelets optical property surface passivation surface state two-dimensional nanomaterials

SCI ; EI

英语

第一 ; 通讯

Shenzhen Science and Technology Innovation Commission[KQJSCX20170726145748464] ; Shenzhen Science and Technology Innovation Commission[JCYJ20180305180553701] ; Shenzhen Science and Technology Innovation Commission[KQTD2015071710313656]

Science & Technology - Other Topics ; Materials Science

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000495769900089

AMER CHEMICAL SOC

20194507616282

II-VI semiconductors ; Nanostructured materials ; Optical properties ; Optoelectronic devices ; Passivation ; Selenium compounds ; Surface states ; Temperature

Protection Methods:539.2.1 ; Thermodynamics:641.1 ; Light/Optics:741.1 ; Optical Devices and Systems:741.3 ; Nanotechnology:761 ; Classical Physics; Quantum Theory; Relativity:931 ; High Energy Physics; Nuclear Physics; Plasma Physics:932

2-s2.0-85074286170

Scopus

1.Department of Electrical and Electronic EngineeringSouthern University of Science and Technology,Shenzhen, Guangdong,518055,China
2.Harbin Institute of Technology,Harbin,150001,China

Yu，Jiahao,Zhang，Chaojian,Pang，Guotao,et al. Effect of Lateral Size and Surface Passivation on the Near-Band-Edge Excitonic Emission from Quasi-Two-Dimensional CdSe Nanoplatelets[J]. ACS Applied Materials & Interfaces,2019,11(44):41821-41827.

Yu，Jiahao,Zhang，Chaojian,Pang，Guotao,Sun，Xiao Wei,&Chen，Rui.(2019).Effect of Lateral Size and Surface Passivation on the Near-Band-Edge Excitonic Emission from Quasi-Two-Dimensional CdSe Nanoplatelets.ACS Applied Materials & Interfaces,11(44),41821-41827.

Yu，Jiahao,et al."Effect of Lateral Size and Surface Passivation on the Near-Band-Edge Excitonic Emission from Quasi-Two-Dimensional CdSe Nanoplatelets".ACS Applied Materials & Interfaces 11.44(2019):41821-41827.