KuQuinones: a new class of polyquinoid compounds as photoactive species on ITO

Valeria Conte^a, Mariano Venanzi^a, Barbara Floris^a, Pierluca Galloni^a, Emanuela Gatto^a, Sara Lentini^a, Federica Sabuzi^a

^aUniversity of Rome (Tor Vergata), Via del Politecnico, 1, Roma, Italy

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Federica Sabuzi, 436
Publication date: 5th February 2015

The conversion of sunlight to electricity through solar cells represents one of the most promising way to produce energy. KuQuinones belong to a new class of polyquinoid compounds discovered few years ago in our research group, characterized by a broad absorption spectrum in the visible region and a favorable reduction potential^[1]. In general, UV-vis absorption spectrum of KuQuinones shows two intense and broad bands between 450 and 600 nm, due to the extended electronic conjugation over the five rings. KuQuinones are also characterized by a low reduction potential. This evidence suggested that the pentacyclic diquinoid compound might be a more efficient electron acceptor molecule than simpler quinoid compounds. Hence, these properties make them candidates as sensitive materials in photoelectrochemical devices. Langmuir Blodgett mono- and multilayers of 1-(9-hydroxynonyl)KuQuinone (KuQ(CH₂)₉OH) have been prepared on an hydrophilic substrate, such as indium tin oxide (ITO). The efficiency of each film has been evaluated through the determination of IPCE values (incident photon to current conversion efficiency) and quantum yields (Φ). A photocurrent generation mechanism will be proposed.
(Left): Structure of 1-(9-hydroxynonyl)KuQuinone; (Right): Absorption spectrum of 1-(9-hydroxynonyl)KuQuinone on ITO surface.
[1] Coletti, A.; Lentini, S.; Conte, V.; Floris, B.; Bortolini, O.; Sforza, F.; Grepioni F.; Galloni, P. Unexpected One-Pot Synthesis of Highly Conjugated Pentacyclic Diquinoid Compounds. J. Org. Chem. 2012, 77, 6873-6879.

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