Large-scale full-solution, vacuum-free gravure printed ITO-free flexible organic solar cells

Inhaltsverzeichnis (Table of Contents)

• Introduction
  • The need for solar energy
  • Generations of solar cell technology
  • Research fields of organic solar cells
• State of art and motivation
• Fundamentals
  • Working principle of OPV device
  • Device geometries of OPV device
  • ITO-free OPV device
  • Materials in OPV device
  • Characterization of OPV device
    • J-V curve
    • LBIC
  • Large-scale manufacturing methods for OPV
    • Coating technologies
      • Slot-die coating
      • Blade coating
      • Spray coating
    • Printing technologies
      • Screen printing
      • Gravure printing
      • Flexographic printing
      • Inkjet printing
    • Summary of coating and printing techniques
    • R2R concept and manufacturing strategies
• Experimental
  • Gravure printing of silver back cathode
  • Gravure printing of ZnO
  • Gravure printing of active layer
  • Gravure printing of PEDOT:PSS
  • Gravure printing of silver front anode
  • Deposition of remaining layers
  • Characterization
• Results and discussion
  • Gravure printed silver back cathode
  • Gravure printed ZnO
  • Gravure printed active layer
  • Gravure printed PEDOT:PSS
  • Gravure printed silver front anode
  • Summary of results
• Challenges

Zielsetzung und Themenschwerpunkte (Objectives and Key Themes)

This bachelor thesis explores the fabrication and evaluation of large-scale, flexible organic solar cells. It focuses on the use of gravure printing in a modified inverted device geometry, aiming to achieve roll-to-roll processed, ITO-free solar cells on a flexible PET substrate. The main goal is to demonstrate the feasibility and performance of this manufacturing approach.

• Large-scale, roll-to-roll processing of organic solar cells
• Gravure printing as a fabrication method for ITO-free devices
• Device performance and efficiency of gravure-printed organic solar cells
• Challenges and solutions associated with gravure printing in organic solar cell fabrication
• Comparison of gravure printing with other coating and printing techniques

Zusammenfassung der Kapitel (Chapter Summaries)

This thesis begins with an introduction to renewable energies and organic photovoltaic, followed by a review of the state-of-the-art in gravure printing of organic solar cells. The fundamentals of organic photovoltaic, including device working principle, geometries, materials, and characterization methods, are discussed in detail. The thesis then focuses on large-scale manufacturing methods for organic solar cells, with an emphasis on roll-to-roll processing. The experimental section describes the design, machinery, and fabrication processes used to create the gravure-printed flexible organic solar cells. The results and discussion sections present the characterization data of the fabricated solar cells, including challenges encountered during the study and solutions developed.

Schlüsselwörter (Keywords)

This thesis centers on the research and development of large-scale, flexible organic solar cells fabricated using gravure printing. Key focus areas include roll-to-roll processing, ITO-free devices, device efficiency, and challenges encountered in the fabrication process. The work also examines other coating and printing techniques for organic solar cell production, such as slot-die coating and flexographic printing.