Swedish startup offers n-type conductive inks for organic, perovskite solar cells
Swedish startup N-ink has launched n-type conductive ink that can be used in the charge-extracting layer of organic solar cells (OPV), as well as in transport layers of perovskite solar cells.
The company offers three formulations of its ink, which it notes has a high electron conductivity, from 0.01 S/cm up to 3000 S/cm, and thermal stability. It can reportedly withstand tests of 24 hours at 200 C, and 1 hour at 350 C in nitrogen.
“In the past n-type polymers were never able to reach the performance and scaling that were reached with p-type polymers,” Marc-Antoine Stoeckel, N-ink COO and co-founder, told pv magazine. “Now we have developed a polymer-based n-type ink that has the electrical conductivity and energetics required for indoor and outdoor PV.”
Besides performance and handling benefits, the N-ink material has several other advantages. “It enables a fully printed PV process. It is alcohol or water-based, a halogen-free and environmentally-friendly precursor,” said Stoeckel, noting it has the potential to reduce PV manufacturing costs, while offering the advantages of polymer material, such as flexibility.
The company has several research projects underway with PV industry partners located in Europe.
It is also a member of the Sunrey consortium, a Horizon Europe-funded research project with 13 partners working on processes and materials to fabricate high-efficiency, lead-free perovskite devices.
“We are also working on inks for the capacitor market and providing a polyfluoroalkyl substances-free (PFAS-free) alternative for use in lithium-ion battery research,” said Stoeckel.
“Formulations tailored for OPV and perovskite solar cells can be ordered directly from the website,” said Stoeckel.
A spinoff of the Laboratory of Organic Electronics, Linköping University, n-ink was founded in 2020 and has raised a total of €2 million ($ 2.06 million) in equity finance to date.
Its conductive ink technology based on BBL:PEI, short for poly(benzimidazobenzophenanthroline):poly(ethyleneimine), is described in “A high-conductivity n-type polymeric ink for printed electronics,” published in 2021 in nature.
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