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Int. J. Mol. Sci. 2012, 13(10), 12880-12889; doi:10.3390/ijms131012880
Article

Substrate Temperature Dependent Surface Morphology and Photoluminescence of Germanium Quantum Dots Grown by Radio Frequency Magnetron Sputtering

1
, 1,* , 2
, 2
 and 3
Received: 16 August 2012; in revised form: 19 September 2012 / Accepted: 21 September 2012 / Published: 9 October 2012
(This article belongs to the Section Material Sciences and Nanotechnology)
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Abstract: The visible luminescence from Ge nanoparticles and nanocrystallites has generated interest due to the feasibility of tuning band gap by controlling the sizes. Germanium (Ge) quantum dots (QDs) with average diameter ~16 to 8 nm are synthesized by radio frequency magnetron sputtering under different growth conditions. These QDs with narrow size distribution and high density, characterized using atomic force microscopy (AFM) and field emission scanning electron microscopy (FESEM) are obtained under the optimal growth conditions of 400 °C substrate temperature, 100 W radio frequency powers and 10 Sccm Argon flow. The possibility of surface passivation and configuration of these dots are confirmed by elemental energy dispersive X-ray (EDX) analysis. The room temperature strong visible photoluminescence (PL) from such QDs suggests their potential application in optoelectronics. The sample grown at 400 °C in particular, shows three PL peaks at around ~2.95 eV, 3.34 eV and 4.36 eV attributed to the interaction between Ge, GeOx manifesting the possibility of the formation of core-shell structures. A red shift of ~0.11 eV in the PL peak is observed with decreasing substrate temperature. We assert that our easy and economic method is suitable for the large-scale production of Ge QDs useful in optoelectronic devices.
Keywords: Ge quantum dots; visible photoluminescence; RMS roughness Ge quantum dots; visible photoluminescence; RMS roughness
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Samavati, A.; Othaman, Z.; Ghoshal, S.K.; Dousti, M.R.; Kadir, M.R.A. Substrate Temperature Dependent Surface Morphology and Photoluminescence of Germanium Quantum Dots Grown by Radio Frequency Magnetron Sputtering. Int. J. Mol. Sci. 2012, 13, 12880-12889.

AMA Style

Samavati A, Othaman Z, Ghoshal SK, Dousti MR, Kadir MRA. Substrate Temperature Dependent Surface Morphology and Photoluminescence of Germanium Quantum Dots Grown by Radio Frequency Magnetron Sputtering. International Journal of Molecular Sciences. 2012; 13(10):12880-12889.

Chicago/Turabian Style

Samavati, Alireza; Othaman, Zulkafli; Ghoshal, Sib Krishna; Dousti, Mohammad Reza; Kadir, Mohammed Rafiq Abdul. 2012. "Substrate Temperature Dependent Surface Morphology and Photoluminescence of Germanium Quantum Dots Grown by Radio Frequency Magnetron Sputtering." Int. J. Mol. Sci. 13, no. 10: 12880-12889.



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