Isomerism effect on the photovoltaic properties of benzotrithiophene-based hole-transporting materials. Issue 18 (23rd March 2017)

• Record Type: Journal Article
• Authors: García-Benito, Inés; Zimmermann, Iwan; Urieta-Mora, Javier; Aragó, Juan; Molina-Ontoria, Agustín; Ortí, Enrique; Martín, Nazario; Nazeeruddin, Mohammad Khaja
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 18(2017)
• Page Start: 8317
• Page End: 8324
• Publication Date: 2017-03-23
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta00997f
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Isomerism of benzotrithiophene-based hole transporting materials is shown to have a significant impact on conductance properties, affording photovoltaic efficiency values as high as 19%. Abstract : Engineering of inorganic–organic lead halide perovskites for photovoltaic applications has experienced significant advances in recent years. However, the use of the relatively expensive spiro-OMeTAD as a hole-transporting material (HTM) poses a challenge due to dopant-induced degradation. Herein we introduce two new three-armed and four-armed HTMs (BTT-4 andBTT-5 ) based on isomeric forms of benzotrithiophene (BTT). The isomerism impact on the optical, electrochemical and photophysical properties and the photovoltaic performance is systematically investigated. Perovskite solar cells (PSCs) usingBTT-4 andBTT-5 as HTMs show remarkable light-to-energy conversion efficiencies of 19.0% and 18.2%, respectively, under standard measurement conditions. These results validate the readily available BTT heteroaromatic structure as a valuable core for the design of highly efficient HTMs for the preparation of PSCs.