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Solution-Processed Cubic GaN for Potential Lighting Applications

Published online by Cambridge University Press:  15 February 2019

Aakash Kumar Jain ,
Sushma Yadav ,
Meenal Mehra ,
Sameer Sapra  and
Madhusudan Singh Open the ORCID record for Madhusudan Singh [Opens in a new window]
Aakash Kumar Jain
Affiliation:
Department of Electrical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, India
Sushma Yadav
Affiliation:
Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, India. Institute of Physical Chemistry and Electrochemistry, Leibnitz University of Hannover, Germany
Meenal Mehra
Affiliation:
Department of Electrical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, India Momentive Performance Materials India Pvt. Ltd., Bengaluru, India
Sameer Sapra
Affiliation:
Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, India.
Madhusudan Singh*
Affiliation:
Department of Electrical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, India
*
*(Email: singh.madhusudan@gmail.com)
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Abstract:

Cubic gallium nitride (GaN) is a wide bandgap semiconductor that exhibits a high crystallographic symmetry resulting in a lower inbuilt polarization which is useful for more efficient phosphor-free green light-emitting diodes. It has been grown using molecular beam epitaxy (MBE) and metal-organic chemical vapor deposition (MOCVD), which produce highly ordered thin films on compatible substrates. In this work, we report the chemical synthesis of GaN using chemical metathesis reaction in diethyl ether with lithium nitride and anhydrous gallium chloride as precursors, inside a nitrogen glove box at the room temperature. The resulting product was subsequently washed to remove lithium chloride and dried before vacuum annealing in a furnace at 850°C. Powder X-ray diffraction (XRD) scans of the as-prepared and annealed product reveal a mixed phase of GaN along with Ga2O3. Energy dispersive X-ray spectroscopy (EDAX) measurements show a nitrogen-poor product, which correlates well with the nearly black color of the powder. Diffuse reflectance spectroscopy (DRS) measurements were carried out with the obtained product on a barium sulfate substrate in a Perkin-Elmer Lambda 1050-UV-Vis-NIR spectrophotometer showing a strong absorbance below 400 nm. The energy band gap is bounded by values extracted from the Tauc plot and DRS measurements in the range of 3.2-3.5 eV, which is in good agreement with the known excitonic bandgap of cubic GaN (∼ 3.3 eV). Initial photoluminescence (PL) measurements using a Perkin-Elmer LS-55 spectrophotometer with an excitation wavelength of 310 nm reveal a weak emission centered around 440 nm corresponding to the known defect centers (D0X) in GaN. Further development of this process to form inks is expected to provide an alternate pathway to producing flexible phosphor-free lighting devices.

Keywords

III-Vluminescencenitride

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Type
Articles
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MRS Advances , Volume 4 , Issue 9: Electronic, Photonic and Magnetic Materials , 2019 , pp. 567 - 574
Copyright
Copyright © Materials Research Society 2019 

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