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3D asymmetric carbozole hole transporting materials for perovskite solar cells

Sheibani, E ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.solener.2019.07.091
  3. Publisher: Elsevier Ltd , 2019
  4. Abstract:
  5. Carbazole compounds are p-type hole-transporting materials (HTMs) useful for perovskite solar cells (PSCs). In this work, we developed a new class of carbazol based HTMs; non-fused 3-D asymmetric structures (S14 and S12) as HTM of PSCs. To the best of our knowledge, there is no report on non-fused HTMs with a high glass transition temperature (Tg = 165 °C), which reduces crystallization and suppresses grain boundaries in glassy film, resulting in long-term durability. Experimental results show that tuning the carbazole moiety in S14 structure has a constructive influence on geometrical alignment, hole mobility, hydrophobicity, stability as well as efficiency. The resultant power conversion efficiency (PCE) of devices were 15.31% and 11.85% for S14 and S12, respectively. Cell efficiency decreases during the first day for all devices. But after this time, the cell efficiency of the device fabricated with S14 remains constant until 1000 h at atmospheric condition without encapsulation while for devices fabricated by S12 and Spiro-OMeTAD the cell efficiency decreases to 75% and 69%. © 2019
  6. Keywords:
  7. 3D non-fused carbazole structure ; Carbazole ; Hole-transporting materials ; Perovskite solar cells ; Efficiency ; Glass ; Glass transition ; Grain boundaries ; Hole mobility ; Perovskite ; Polycyclic aromatic hydrocarbons ; Asymmetric structures ; Atmospheric conditions ; Cell efficiency ; High-glass transition temperatures ; Long term durability ; Power conversion efficiencies ; Chemical composition ; Crystallization ; Encapsulation ; Energy efficiency ; Temperature profile
  8. Source: Solar Energy ; Volume 189 , 2019 , Pages 404-411 ; 0038092X (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0038092X19307625