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Overcome low intrinsic conductivity of Niox through triazinyl modification for highly efficient and stable inverted perovskite solar cells

Yang, J ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1002/solr.202200422
  3. Publisher: John Wiley and Sons Inc , 2022
  4. Abstract:
  5. Nickel oxide (NiOx) is a promising hole transport material in inverted organic-inorganic metal halide perovskite solar cells. However, its low intrinsic conductivity hinders its further improvement in device performance. Here, we employ a trimercapto-s-triazine trisodium salt (TTTS) as a chelating agent of Ni2+ in the NiOx layer to improve its conductivity. Due to the electron-deficient triazine ring, the TTTS complexes with Ni2+ in NiOx via a strong Ni2+-N coordination bond and increases the ratio of Ni3+:Ni2+. The increased Ni3+ concentration adjusts the band structure of NiOx, thus enhancing hole density and mobility, eventually improving the intrinsic conductivity of NiOx. As a result, the device with TTTS modification displays a champion power conversion efficiency (PCE) of 22.81%. The encapsulated device based on a modified-NiOx layer maintains 94% of its initial power output at the maximum power point and continuous one-sun illumination for 1000 h at 45 °C. In addition, the unencapsulated target devices also maintain 92% at 60 ± 5% relative humidity and 25 °C in the air for 5000 h; and 91% at 85 °C in a nitrogen atmosphere for 1000 h. The research provides an effective strategy to enhance PCE and stability of inverted PSCs via modifying NiOx films with triazine molecule. © 2022 Wiley-VCH GmbH
  6. Keywords:
  7. Inverted perovskite solar cells ; C++ (programming language) ; Cell engineering ; Chelation ; Coordination reactions ; Display devices ; Hole mobility ; Metal halides ; organic-inorganic materials ; Perovskite ; Perovskite solar cells ; Additive engineering ; Device stability ; Hole transport materials ; Inorganic metals ; Intrinsic conductivity ; Inverted perovskite solar cell ; Organic/inorganic ; Oxide layer ; Power conversion efficiencies ; S-Triazines ; Nickel oxide
  8. Source: Solar RRL ; Volume 6, Issue 9 , 2022 ; 2367198X (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/solr.202200422