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Indium Tin Oxide-Free Inverted Organic Photovoltaics Using Laser-Induced Forward Transfer Silver Nanoparticle

Sergey M Pozov¹, Kostas Andritsos², Ioannis Theodorakos²

¹Molecular Electronics and Photonics Research Unit, Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Limassol 3603, Cyprus.

ACS Applied Electronic Materials

|July 5, 2022

Summary

Laser-induced forward transfer printing fabricates silver nanoparticle grids for efficient, indium tin oxide-free organic solar cells. An embedding process enhances conductivity and transparency for 11.0% power conversion efficiency.

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Area of Science:

Materials Science
Nanotechnology
Renewable Energy

Background:

Laser-induced forward transfer (LIFT) printing is a versatile digital technique for electronic materials.
Indium tin oxide (ITO)-free organic photovoltaics (OPVs) offer a sustainable alternative to traditional solar cells.

Purpose of the Study:

To introduce LIFT printing for fabricating silver (Ag) nanoparticle (np) grids in ITO-free inverted OPVs.
To address limitations of direct LIFT-printed Ag np grids via an embedding process.
To optimize Ag grid design and device engineering for enhanced OPV performance.

Main Methods:

Fabrication of Ag np grids using LIFT printing.
Development of a Ag grid embedding (EMP) process to improve conductivity and control transparency.
Integration of EMP-processed Ag grids into inverted PM6:Y6 nonfullerene acceptor OPVs.
Device optimization through metal-grid design and engineering.

Main Results:

Demonstrated LIFT printing of Ag np grids for ITO-free inverted OPVs.
Achieved high electrical conductivity in embedded Ag grid lines.
Varied Ag grid transparency by adjusting the number of grid lines.
Realized an 11.0% power conversion efficiency in OPVs with an EMB-nine-line Ag np grid.

Conclusions:

LIFT printing, combined with an embedding process, is a viable method for fabricating high-performance Ag grids in ITO-free OPVs.
The EMP process enables control over conductivity and transparency, crucial for device efficiency.
Optimized device architecture incorporating laser-printed Ag grids leads to significant power conversion efficiencies, paving the way for cost-effective and flexible solar technologies.