Transition Metal Doped Quantum Dots for Photovoltaic Applications

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Transition Metal Doped Quantum Dots for Photovoltaic Applications
Trieu Le
Thilini K. Ekanayaka
Annika Neufeld-Kreider
Archit Dhingra
Takashi Komesu
Andrew J. Yost
Carolina C. Ilie
SUNY Oswego
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Subjects / Keywords:
quantum dot
solar cell


In recent years, semiconductor zinc sulfide (ZnS) quantum dots have been considerably studied for various applications such as light-emitting diodes, flat panel display, UV sensor, and solar cell application. We discuss herein the optical and transport properties of the transition metal doped quantum dots and optimize them for better photovoltaics. Zinc sulfide has excellent optical and electronic performances due to its wide bandgap. In addition, cobalt-nickel doped zinc sulfide brings a versatility of the band gap energy. This is corresponding to an enhancement in the photo-to-current efficiency of doped quantum dots in sensitized solar cell. In this study, we explore how the different dopants lead changes in the bandgap and discuss the characteristic of these doped quantum dots. The absorption data shows that cobalt-nickel doped ZnS has the highest absorbance the visible range out of all the single and co-doped and tri-doped quantum dots which made it the best candidate for optoelectronic device fabrication.
Collected for SUNY Oswego Institutional Repository by the online self-submittal tool. Submitted by Trieu Le.
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Based on work for Summer REU 2019 at University of Nebraska-Lincoln

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SUNY Oswego
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SUNY Oswego Institution
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Trieu Le , 1 Thilini K. Ekanayaka, 2 Annika Neufeld Kreider, 1 Archit Dhingra, 2 Takashi Komesu, 2 Andrew J. Yost, 3 and Carolina C. Ilie 1 1 Department of Physics, State University of New York at Oswego, Oswego, NY 13126, U.S.A. 2 Department of Physics and Astronomy, University of Nebraska Lincoln, Lincoln, NE 68588 0299, U.S.A. 3 Department of Physics, Oklahoma State University, Stillwater, OK, 74078, U.S.A. Transition Metal Doped Quantum Dots for Photovoltaic Applications


Zinc sulfide quantum dots: Doped with Transitional metals: Mn, Co, Ni. Recent improvement in photo to current efficiency of Mn:PbS Trieu Le Dilute Magnetic Semiconductors A. J. Yost, A. K. Pimachev , G. Rimal , J. Tang, et al ., Appl. Phys. Lett. 111, 233101 (2017) Application : Easy and safe synthesis method Light emitting diodes(LED) UV sensor Solar cell application G. Rimal , A. K. Pimachev , A. J. Yost, U. Poudyal, et al ., Appl. Phys. Lett. 109, 103901 (2016)


Procedure : Zinc acetate dihydrate was dissolved in dimethyl sulfoxide (add desired transitional metals) 1 thioglycerol was added dropwise. Temperature: , Inject aqueous solution. Constant mixing for 9 12 hours Synthesis setup Trieu Le Synthesis Method C. C. Ilie , F. Guzman, B. L. Swanson, I. R. Evans, et al ., 2018 J. Phys.: Condens . Matter 30 18LT02 a) b) c) d) e) f) g) h)


Absorption Spectrum: Cobalt allows transition at visible wavelength Co Ni:ZnS = best absorbance ZnS = worst absorbance Trieu Le Optical characterization S. Velusubhash , K. Kalirajan , S. Harikengaram , et al, J. Nanosci. Tech. Volume 4 Issue 5 (2018) 461 466


Tauc Plot: Co doped materials show wider bandgap. X ray Diffraction: Shows a zinc blend structure (space group F43m) with broad peaks. Structure remains unchanged. XRD Trieu Le Band gap and Crystal structure Phys. Status Solidi B 2018, 255, 1800106


Construct solar cells: Transport measurement indicated Co Ni:ZnS makes better solar cell Trieu Le Solar Cell Device Current (nA) Current (nA) Co Ni:ZnS ZnS R. Chaurasiya , A. Dixit. Transition metal doped zns monolayer: The first principles insights, 2017.7


Discovered: Easy and safe synthesis method Cobalt allows transition at visible wavelength XRD shows a zinc blend structure Doped material can be use for solar cell Trieu Le Thank you! Future work : X ray Photoelectron Spectroscopy Scanning Tunneling Microscope Conclusion