Azulenocyanines immobilized on graphene; On the way to panchromatic absorption and efficient DSSC blocking layers

Volland M, Lennert A, Roth AM, Ince M, Torres T, Guldi DM (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Nanoscale Royal Society of Chemistry

Book Volume: 11

Pages Range: 10709-10715

Journal Issue: 22

DOI: 10.1039/c9nr02300c

Abstract

Herein, a novel electron donor-acceptor hybrid consisting of a NIR absorbing azulenocyanine as an electron donor and few-layer graphene as an electron acceptor was prepared. The extended aromatic core of azulenocyanine (1) assists in the exfoliation of graphite and allows the formation of a very high-quality few-layer graphene azulenocyanine hybrid system (2). The formation of a stable azulenocyanine/graphene hybrid was verified by means of an arsenal of spectroscopic and microscopic techniques. Notable is the fact that the absorption spectrum recorded for 1 and likewise that for 2 covers large portions of the solar spectrum, that is, from the UV through the visible to the NIR region. In light of the latter, we incorporated 1 as well as 2 as a photosensitizer in dye sensitized solar cells (DSSCs) and probed their light harvesting. Besides an increase in the photovoltaic conversion efficiency we focused on the stability of DSSCs by preventing charge recombination between FTO and the liquid electrolyte. We used 2 as a blocking layer and in comparison with a TiCl4 pretreated blocking layer a superior conversion efficiency was realized.

Authors with CRIS profile

Michel Volland Lehrstuhl für Physikalische Chemie I Annkatrin Lennert Lehrstuhl für Physikalische Chemie I Alexandra Marina Roth Lehrstuhl für Physikalische Chemie I Dirk Michael Guldi Lehrstuhl für Physikalische Chemie I

Involved external institutions

Tarsus University / Tarsus Üniversitesi TR Turkey (TR) Universidad Autónoma de Madrid (UAM) ES Spain (ES)

How to cite

APA:

Volland, M., Lennert, A., Roth, A.M., Ince, M., Torres, T., & Guldi, D.M. (2019). Azulenocyanines immobilized on graphene; On the way to panchromatic absorption and efficient DSSC blocking layers. Nanoscale, 11(22), 10709-10715. https://dx.doi.org/10.1039/c9nr02300c

MLA:

Volland, Michel, et al. "Azulenocyanines immobilized on graphene; On the way to panchromatic absorption and efficient DSSC blocking layers." Nanoscale 11.22 (2019): 10709-10715.

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