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Electrical and optical characterisation of silicon nanocrystals embedded in SiC
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Optics and Photonics, OFO.
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2014 (English)In: Gettering and Defect Engineering in Semiconductor Technology XV, Scitec Publications Ltd , 2014, 480-485 p.Conference paper (Refereed)
Abstract [en]

Silicon nanocrystals (Si NCs) are a promising candidate for the top cell of an all-Si tandem solar cell with a band gap from 1.3-1.7 eV, tuneable by adjusting NC size. They are readily produced within a Si-based dielectric matrix by precipitation from the Si excess in multilayers of alternating stoichiometric and silicon-rich layers. Here we examined the luminescence and transport of Si NCs embedded in SiC. We observed luminescence that redshifts from 2.0 to 1.5 eV with increasing nominal NC size. Upon further investigation, we found that this redshift is to a large extent due to Fabry-Pérot interference. Correction for this effect allows an analysis of the spectrum emitted from within the sample. We also produced p-i-n solar cells and found that the observed I-V curves under illumination could be well-fitted by typical thin-film solar cell models including finite series and parallel resistances, and a voltage-dependent current collection function. A minority carrier mobility-lifetime product on the order of 10-10 cm2/V was deduced, and a maximum open-circuit voltage of 370 mV achieved.

Place, publisher, year, edition, pages
Scitec Publications Ltd , 2014. 480-485 p.
, Diffusion and Defect Data Pt.B: Solid State Phenomena, ISSN 1012-0394 ; 205-206
Keyword [en]
P-i-n junction, Photoluminescence, Recombination, Silicon carbide, Silicon nanocrystals, Solar cell
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-145473DOI: 10.4028/ 000336338000071ScopusID: 2-s2.0-84886776356ISBN: 978-303785824-0OAI: diva2:718698
15th Gettering and Defect Engineering in Semiconductor Technology, GADEST 2013, 22 September 2013 through 27 September 2013, Oxford

QC 20140522

Available from: 2014-05-22 Created: 2014-05-21 Last updated: 2014-05-22Bibliographically approved

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Dyakov, Sergey A.
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Optics and Photonics, OFO
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