Size-tunable electroluminescence characteristics of quantum confined Si nanocrystals embedded in Si-rich oxide matrix

Arijit Sarkar, Rajshekhar Bar, Sudarshan Singh, Rup Kumar Chowdhury, Sekhar Bhattacharya, Amal Kumar Das, Samit K. Ray

Research output: Contribution to journalArticlepeer-review


Tunable electroluminescence properties of size-controlled Si nanocrystals embedded in silicon rich oxide films are demonstrated at room temperature, using an active light emitting layer in the metal oxide semiconductor device structure. Plasma enhanced chemical vapor deposited Si-rich oxide films were annealed at elevated temperatures to form Si nanocrystals of varying diameters. A typical redshift in the photoluminescence peak is observed with increasing annealing temperature, confirming the formation of quantum confined Si nanocrystals. The carrier transport and light emission mechanism have been studied in detail through current–voltage characteristics and ultrafast transient spectroscopy, respectively. The origin of electroluminescence and the size-tunable emission peak have been analyzed and attributed to the radiative recombination of carriers within Si nanocrystal quantum wells. The fabricated Si nanocrystal-based metal oxide semiconductor light emitting diode and the resultant size-dependent tunable electroluminescence are very attractive as a potential CMOS compatible optical source for future photonic integrated chips.
Original languageEnglish (US)
Pages (from-to)231105
JournalApplied Physics Letters
Issue number23
StatePublished - Jun 12 2020

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: Partial financial support from DST-Meity supported NNetRA “SWI” Project Grant No. DST/NM/NNETRA/2018(G) and MHRD-DRDO IMPRINT “USR” Project Grant No. 3-18/2015-T.S.-I (Vol. IV) is gratefully acknowledged. The authors also acknowledge the use of the Ultrafast Spectroscopy Facility of the Department of Physics, IIT Kharagpur.


Dive into the research topics of 'Size-tunable electroluminescence characteristics of quantum confined Si nanocrystals embedded in Si-rich oxide matrix'. Together they form a unique fingerprint.

Cite this