3D asymmetric carbozole hole transporting materials for perovskite solar cells. (1st September 2019)

• Record Type: Journal Article
• Authors: Sheibani, Esmaeil; Heydari, Mahsa; Ahangar, Hosein; Mohammadi, Hajar; Fard, Hossein Taherian; Taghavinia, Nima; Samadpour, Mahmoud; Tajabadi, Fariba
• Is Part Of: Solar energy. Volume 189(2019)
• Page Start: 404
• Page End: 411
• Publication Date: 2019-09-01
• Subjects: Carbazole -- Hole-transporting materials -- Perovskite solar cells -- 3D non-fused carbazole structure; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2019.07.091
• Languages: English
• ISSNs: 0038-092X

Abstract

Graphical abstract: Highlight: Two cost-effective and the asymmetric hole transporting materials based on carbazole are designed and synthesized. Both HTMs show high glass transition temperature that is critical for reducing crystallization and suppresses grain boundaries in a glassy film. Photovoltaic performance ofS14 is characterized and demonstrated the capability ofS14 as a promising alternative to replace classical Spiro-OMeTAD. The cell efficiency of the device fabricated withS14 remains constant from 30 h to 1000 h at atmospheric condition without encapsulation. Abstract: 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 andS12 ) 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 inS14 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% forS14 andS12, respectively. Cell efficiency decreases during the first day for all devices. But after this time, the cell efficiency of the device fabricated withS14 remains constant until 1000 h at atmospheric condition without encapsulation while for devices fabricated byS12 and Spiro-OMeTAD the cell efficiency decreases to 75% and 69%.