The potential benefits of polyethylenimine as an electron extraction layer for facilitating the manufacturing of inverted organic solar cells

Mozhgan Sadeghianlemraski; Hany Aziz

doi:10.1117/12.2597312

4 August 2021 The potential benefits of polyethylenimine as an electron extraction layer for facilitating the manufacturing of inverted organic solar cells

Mozhgan Sadeghianlemraski, Hany Aziz

Author Affiliations +

Proceedings Volume 11809, Organic, Hybrid, and Perovskite Photovoltaics XXII; 1180910 (2021) https://doi.org/10.1117/12.2597312
Event: SPIE Organic Photonics + Electronics, 2021, San Diego, California, United States

Abstract

The solvent-robustness and temporal stability of polyethylenimine (PEI) as an electron extraction layer (EEL) in inverted organic solar cells (OSCs) were studied. For that purpose, a PEI EEL is utilized in inverted OSCs with the archetypal Poly (3-hexylthiophene) (P3HT): [6,6]-Phenyl C61 butyric acid methyl ester (PC60BM) donor:acceptor system. Results show that soaking the PEI film in solvents (1-propanol and/or toluene) does not significantly impact OSC performance or photostability. As verified by X-ray photoelectron spectroscopy (XPS) measurements, the N atoms in PEI interact with indium-tin-oxide (ITO), causing PEI to strongly adhere to the surface of ITO so that potential processing solvents do not dissolve it. Shifts in N bands in the case of PEI on ITO compared to the PEI on glass confirm the presence of a strong physical interaction. In addition, comparing OSCs with fresh PEI and N2-stored PEI demonstrates that the PEI film is very stable over time, and a time gap between PEI deposition and subsequent fabrication processes does not affect OSC performance and photostability. We highlight that the utilization of PEI as a stable and robust EEL facilitates bridging between laboratory discoveries of OSCs with their practical demonstration and gives us considerable latitude in tackling the stringent requirements of OSC manufacturing.

Conference Presentation

Citation Download Citation

Mozhgan Sadeghianlemraski and Hany Aziz "The potential benefits of polyethylenimine as an electron extraction layer for facilitating the manufacturing of inverted organic solar cells", Proc. SPIE 11809, Organic, Hybrid, and Perovskite Photovoltaics XXII, 1180910 (4 August 2021); https://doi.org/10.1117/12.2597312

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