Phthalocyanine-pyrene conjugates: a powerful approach toward carbon nanotube solar cells.
In the present work, a new family of pyrene (Py)-substituted phthalocyanines (Pcs), i.e., ZnPc-Py and H(2)Pc-Py, were designed, synthesized, and probed in light of their spectroscopic properties as well as their interactions with single-wall carbon nanotubes (SWNTs). The pyrene units provide the means for non-covalent functionalization of SWNTs via π-π interactions. Such a versatile approach ensures that the electronic properties of SWNTs are not impacted by the chemical modification of the carbon skeleton. The characterization of ZnPc-Py/SWNT and H(2)Pc-Py/SWNT has been performed in suspension and in thin films by means of different spectroscopic and photoelectrochemical techniques. Transient absorption experiments reveal photoinduced electron transfer between the photoactive components. ZnPc-Py/SWNT and H(2)Pc-Py/SWNT have been integrated into photoactive electrodes, revealing stable and reproducible photocurrents with monochromatic internal photoconversion efficiency values for H(2)Pc-Py/SWNT as large as 15 and 23% without and with an applied bias of +0.1 V.
Department of Chemistry and Pharmacy and Interdisciplinary Center for Molecular Materials, Friedrich-Alexander-University Erlangen-Nuremberg, 91058 Erlangen, Germany.
Juergen
J
Bartelmess
Beatriz
B
Ballesteros
Gema
G
de la Torre
Daniel
D
Kiessling
Stephane
S
Campidelli
Maurizio
M
Prato
Tomás
T
Torres
Dirk M
DM
Guldi
D001674:Bioelectric Energy Sources; D007211:Indoles / Q000737:chemistry*; D054833:Isoindoles; D037742:Nanotubes, Carbon / Q000737:chemistry*; D011721:Pyrenes / Q000737:chemistry*; D012993:Solar Energy
D007211:Indoles; D054833:Isoindoles; D037742:Nanotubes, Carbon; D011721:Pyrenes; C030984:pyrene; C013647:phthalocyanine