title: Covalently Functionalized SWCNTs as Tailored p-Type Dopants for Perovskite Solar Cells.
abstract: The covalent functionalization of (7,6)-enriched single-walled carbon nanotubes (SWCNTs) with oligophenylenevinylene (OPV) moieties terminating with a dimethylamino group is proposed as an efficient way to enhance the affinity of CNTs with spiro-MeOTAD in perovskite-based solar cells. The evidence of SWCNTs functionalization and the degree of OPV substitution on SWCNTs are established from TGA, XPS, TEM, and Raman techniques. Our tailored doping materials afford photovoltaic performances in line with conventional Li-doped spiro-MeOTAD, showing at the same time a significantly improved chemical stability of the perovskite component over time. Furthermore, the comparison of the photovoltaic performances with those obtained with nonfunctionalized SWCNTs suggest that the presence of the organic appends ensures highly reproducible PV performances. These results demonstrate the suitability of this functionalized SWCNT material as a valid doping agent for spiro-MeOTAD, representing a viable alternative to the conventional Li salt.
authors.affiliation: Department of Chemical and Pharmaceutical Sciences, INSTM UdR Trieste, University of Trieste , Piazzale Europa 1, 34127 Trieste, Italy.|School of Chemistry, Cardiff University , Main Building, Park Place, CF10 3AT Cardiff, United Kingdom.
authors.forename: Tanja
authors.initials: T
authors.lastname: Miletić
authors.affiliation: Istituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche (CNR-ISOF) , Via Gobetti 101, 40129 Bologna, Italy.
authors.forename: Eleonora
authors.initials: E
authors.lastname: Pavoni
authors.affiliation: Dipartimento di Matematica e Fisica "E. De Giorgi", Università del Salento , Via per Arnesano, 73100 Lecce, Italy.
authors.forename: Vanira
authors.initials: V
authors.lastname: Trifiletti
authors.affiliation: Istituto di Nanotecnologia CNR-Nanotec , Polo di Nanotecnologia c/o Campus Ecotekne, via Monteroni, 73100 Lecce, Italy.
authors.forename: Aurora
authors.initials: A
authors.lastname: Rizzo
authors.affiliation: Dipartimento di Matematica e Fisica "E. De Giorgi", Università del Salento , Via per Arnesano, 73100 Lecce, Italy.|Istituto di Nanotecnologia CNR-Nanotec , Polo di Nanotecnologia c/o Campus Ecotekne, via Monteroni, 73100 Lecce, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Listorti
authors.affiliation: Dipartimento di Matematica e Fisica "E. De Giorgi", Università del Salento , Via per Arnesano, 73100 Lecce, Italy.|Istituto di Nanotecnologia CNR-Nanotec , Polo di Nanotecnologia c/o Campus Ecotekne, via Monteroni, 73100 Lecce, Italy.
authors.forename: Silvia
authors.initials: S
authors.lastname: Colella
authors.affiliation: Istituto per la Sintesi Organica e la Fotoreattività, Consiglio Nazionale delle Ricerche (CNR-ISOF) , Via Gobetti 101, 40129 Bologna, Italy.
authors.forename: Nicola
authors.initials: N
authors.lastname: Armaroli
authors.affiliation: Department of Chemical and Pharmaceutical Sciences, INSTM UdR Trieste, University of Trieste , Piazzale Europa 1, 34127 Trieste, Italy.|School of Chemistry, Cardiff University , Main Building, Park Place, CF10 3AT Cardiff, United Kingdom.
authors.forename: Davide
authors.initials: D
authors.lastname: Bonifazi
keywords: SWCNTs; chemical stability; covalent functionalization; hole transport materials; p-type doping; perovskite solar cells; photovoltaics