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Spiro-linked organic small molecules as hole-transport materials for perovskite solar cells
- Gangala, Sivakumar, Misra, Rajneesh
- Journal of materials chemistry 2018 v.6 no.39 pp. 18750-18765
- chemistry, solar cells, solar energy
- Organic–inorganic halide perovskite solar cells (PSCs) have attracted great attention as an alternative renewable photovoltaic technology with a power conversion efficiency (PCE) > 22%, which is on par with established technologies. The state-of-the-art spiro-OMeTAD (2,2′,7,7′-tetrakis-(N,N-di-p-methoxyphenyl-amine)-9,9′-spirobifluorene) is the most successful hole-transport material (HTM) employed in PSCs. Recently, various types of spiro-linked organic small molecules have been reported to overcome the reported disadvantages of spiro-OMeTAD, such as a complex synthetic route, high synthetic cost, and requirement for hygroscopic dopants to improve the charge-carrier mobility and device performance, which significantly limits spiro-OMeTAD for large-scale application in the future. Herein, we provide an overview of recent developments in the design, synthesis, and characterization of spiro-linked organic small molecules as hole-transport materials (HTM) in perovskite solar cells (PSCs).