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Selenophene-Based Hole-Transporting Materials for Perovskite Solar Cells.

Authors :: Illicachi LA
Urieta-Mora J
Momblona C
Molina-Ontoria A
Calbo J
Aragó J
Insuasty B
Ortiz A
Ortí E
Martín N
Nazeeruddin MK
Source :: ChemPlusChem [Chempluschem] 2021 Jun 24; Vol. 86 (7), pp. 1006-1013. Date of Electronic Publication: 2021 Jun 24.
Publication Year :: 2021
Publisher :: Ahead of Print
Abstract: Two novel and simple donor-π-bridge-donor (D-π-D) hole-transporting materials (HTMs) containing two units of the p-methoxytriphenylamine (TPA) electron donor group covalently bridged by means of the 3,4-dimethoxyselenophene spacer through single and triple bonds are reported. The optoelectronic and thermal properties of the new selenium-containing HTMs have been determined using standard experimental techniques and theoretical density functional theory (DFT) calculations. The selenium-based HTMs have been incorporated in mesoporous perovskite solar cells (PSCs) in combination with the triple-cation perovskite [(FAPbI <subscript>3</subscript> ) <subscript>0.87</subscript> (MAPbBr <subscript>3</subscript> ) <subscript>0.13</subscript> ] <subscript>0.92</subscript> [CsPbI <subscript>3</subscript> ] <subscript>0.08</subscript> . Limited values of power conversion efficiencies, up to 13.4 %, in comparison with the archetype spiro-OMeTAD (17.8 %), were obtained. The reduced efficiencies showed by the new HTMs are attributed to their poor film-forming ability, which constrains their photovoltaic performance due to the appearance of structural defects (pinholes).<br /> (© 2021 Wiley-VCH GmbH.)