Bandgap engineering of titanium based oxynitride thin films and molybdenum disulfide thin films for photovoltaic applications

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
Michael R. Froeschle (Creator)
The University of North Carolina at Greensboro (UNCG )
Web Site:
Hemali Rathnayake

Abstract: The purpose of this project was to investigate the potential of two different material systems for the improvement of solar cell efficiency; one based on a titanium oxynitride system and the other molybdenum disulfide. Both phases of the project utilized different fabrication methods and approach in designing the photovoltaic devices. For the titanium based system (TiNO), thin films were formed using pulsed laser deposition, a phase vapor deposition (PVD) technique. The photovoltaic cells deposited on ITO coated glass with copper electrodes yielded an average power conversion efficiency (PCE) of 4.47%, with a fill factor (FF) of 0.246, open circuit voltage (Voc) of 0.18 V, and a short circuit current density (Jsc) of 58.43 mA/cm2. XRD and XPS results provide insight into the materials composition and give evidence of multiple bandgap mediated transfer of charge carriers. For the molybdenum based device, monolayer molybdenum disulfide was incorporated into a current organic-based solar cell (OSC) as an electron transport layer. The active layer consists of a blend of donor Poly(3-hexylthiophene-2,5-diyl) and acceptor PCBM. MoS2 incorporated devices showed improved PCE, at 0.88% compared to that of the control samples which yielded a PCE of 0.22%. [This abstract has been edited to remove characters that will not display in this system. Please see the PDF for the full abstract.]

Additional Information

Language: English
Date: 2019
Laser, Molybdenum, Photovoltaic, Pulsed, Solar, Titanium
Solar cells
Photovoltaic cells
Energy gap (Physics)

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