Photoluminescence behavior in the synthesized CdSe thin films deposited on ITO substrates

被引：20

作者：

Smida, A. ^{[1
]}

Zaaboub, Z. ^{[2
]}

Mohamed, N. Bel Haj ^{[3
]}

Hassen, M. ^{[4
]}

Laatar, F. ^{[1
]}

Maaref, H. ^{[3
]}

Ezzaouia, H. ^{[1
]}

机构：

[1] CRTEn, LSNTA, Tourist Route Soliman,BP95, Hammam Lif 2050, Tunisia

[2] Univ Monastir, Lab Microoptoelect & Nanostruct LMON, Fac Sci Monastir, Ave Environm, Monastir 5019, Tunisia

[3] Univ Monastir, Fac Sci Monastir, LIMA, Ave Environm, Monastir 5019, Tunisia

[4] Higher Inst Appl Sci & Technol Sousse, City Taffala Ibn Khald 4003, Sousse, Tunisia

来源：

JOURNAL OF LUMINESCENCE | 2018年 / 194卷

关键词：

CdSe nanocrystals (NCs); Organic ligand; Solution temperature (ST); Radiative recombination; Surface states; TRPL; OPTICAL-PROPERTIES; QUANTUM DOTS; ELECTRICAL-PROPERTIES; NANOCRYSTALLINE CDSE; NANOPARTICLES; LUMINESCENCE; CRYSTALLITES; DYNAMICS; GROWTH; SIZE;

D O I：

10.1016/j.jlumin.2017.09.036

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Cadmium Selenide nanoparticles (CdSe NPs) deposited on ITO substrates were prepared in aqueous solution by spin-coating method using L-Cysteine as organic stabilizer. The effect of solution temperature (ST) on the morphological and optical properties of CdSe NPs, deposited on ITO substrates was investigated by Atomic force microscopy (AFM), UV-Vis absorption, photoluminescence (PL) and time resolved photoluminescence ( TRPL) spectroscopy. Results showed that increasing in the ST up to 70 degrees C improved the crystalline quality of the CdSe NPs, decreased their band gap energy and enhanced the PL intensity. Higher solution temperature induced a reduction in PL intensity with a blue shift of the emission wavelength, which is attributed to quantum confinement effect. The TRPL measurements showed two PL decay times attributed to radiative recombination processes, and the trapping of carriers at the surface states. After heat treatment of the CdSe NCs solution, the decay components were predominated by the fast decay time (89%) suggesting the good surface passivation of nanocrystals.

引用

页码：686 / 691

页数：6

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