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Room-temperature deposited fluorine-doped tantalum pentoxide for stable organic solar cells

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2022

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Polydorou, Ermioni
Verouti, Maria
Soultati, Anastasia
Armadorou, Konstantina-Kalliopi
Verykios, Apostolis
Filippatos, Petros-Panagis
Galanis, George
Palilis, Leonidas C.
Vasilopoulou, Maria
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Organic Electronics. Elsevier. 2022, 108, 106607. ISSN 1566-1199. eISSN 1878-5530. Available under: doi: 10.1016/j.orgel.2022.106607

Zusammenfassung

Earth-abundant transition metal oxides deposited at room temperature with low-cost methods suitable for large area manufacturing can offer advances in many fields of energy related devices. Here we report the room-temperature deposition of a fluorine-doped tantalum pentoxide using a home-made, low-cost hot-wire deposition system. This novel tantalum oxyfluoride material is super hydrophobic, ultra-transparent within the visible spectrum, and possesses adequate conductivity and suitable valence band and conduction band extrema for acting as efficient hole extraction and electron blocking layer in organic solar cells with the forward architecture. By inserting this material in the form of nanoparticles deposited on top of the commonly used as hole transport layer poly(3,4-ethylenedioxythiophene) polystyrene sulfonate, higher efficiencies compared to the reference cells without the nanoparticles were demonstrated in solar cells based on blends of polymer donors with either a fullerene (where maximum achieved efficiency was improved from 6.07% to 7.90%) or a non-fullerene acceptor (reaching values of 13.48% compared to 11.32% of the reference cell). Moreover, significant improvement in device stability was achievd in unencapsulated devices continuously exposed in a humid environment for 500 h. This work demonstrates the unambiguous potential of well-designed metal oxide materials as charge transport and blocking interlayers and protective buffers in organic solar cells and beyond.

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ISO 690POLYDOROU, Ermioni, Maria VEROUTI, Anastasia SOULTATI, Konstantina-Kalliopi ARMADOROU, Apostolis VERYKIOS, Petros-Panagis FILIPPATOS, George GALANIS, Leonidas C. PALILIS, Azhar FAKHARUDDIN, Maria VASILOPOULOU, 2022. Room-temperature deposited fluorine-doped tantalum pentoxide for stable organic solar cells. In: Organic Electronics. Elsevier. 2022, 108, 106607. ISSN 1566-1199. eISSN 1878-5530. Available under: doi: 10.1016/j.orgel.2022.106607
BibTex
@article{Polydorou2022Roomt-59631,
  year={2022},
  doi={10.1016/j.orgel.2022.106607},
  title={Room-temperature deposited fluorine-doped tantalum pentoxide for stable organic solar cells},
  volume={108},
  issn={1566-1199},
  journal={Organic Electronics},
  author={Polydorou, Ermioni and Verouti, Maria and Soultati, Anastasia and Armadorou, Konstantina-Kalliopi and Verykios, Apostolis and Filippatos, Petros-Panagis and Galanis, George and Palilis, Leonidas C. and Fakharuddin, Azhar and Vasilopoulou, Maria},
  note={Article Number: 106607}
}
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