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.com
Volume 5, Issue 6 (Suppl)
J Mat. Sci.
ISSN: 2321-6212
Advanced Materials 2017
October 26-28, 2017
OCTOBER 26-28, 2017 OSAKA, JAPAN
13
TH
INTERNATIONAL CONFERENCE ON
Advanced Materials and Nanotechnology
Solution processed ZnPc hole-transporting layers for photovoltaic devices
Tamara Potlog
Moldova State University, Republic of Moldova
D
uring four past decades, research on Organic Photovoltaic Devices (OPV) has progressed using a few standard materials
which were not initially designed for this purpose but for other applications such as tainting, paint or xerography. The
enhancement of the photo-generation of charges in a phthalocyanine in the presence of an electron-acceptor had been reported
in 1980. Since Tang’s first report in 1986 of a hetero-junction bilayer organic solar cell composed of Cu-phthalocyanine and a
perylene derivative the field has expanded rapidly and recently includes a wide variety of small molecule solar cells containing
phthalocyanines or porphyrins as dyes, conjugated polymers as the p-type donor phase and C
60
or perylene derivatives as
the acceptor phase. Most Metal Phthalocyanines (MPcs) are usually highly insoluble and need to be processed by vacuum
deposition. Zinc phthalocyanine (ZnPc) is a particularly attractive sub-class of Pcs given the elemental abundance, very low
toxicity levels and low band gap (~1.7 eV) well-matched to the incident solar spectrum. However, to date not report exists on
the use of solution processed ZnPc as dyes in photovoltaic devices, therefore many research activities focused on synthesizing
soluble phthalocyanines by adding functional groups to the molecule. Unfortunately, most of the substituted phthalocyanines
are not as stable as the unsubstantiated compounds and their electronic properties are also different from those of the un-
substituted phthalocyanine. Here, we report the solubility of ZnPc in the mixture of formic acid and N-methyl-2-pyrrolidone
and its use for solution processing of Schotttky and BHJ photovoltaic devices with photovoltaic open circuit voltage and short-
circuit current density higher than if it is obtained by the vacuum evaporation method. Various characterization techniques
were employed to estimate the structural and optical features of ZnPc hole-transporting layers, including XRD, FTIR and
UV-VIS-NIR spectroscopy. In addition, the photovoltaic parameters of fabricated photovoltaic devices was estimated from
current-voltage characteristics taken at 300 K using a Keithley 2400 source meter, under different illuminations.
tpotlog@gmail.comJ Mat. Sci. 2017, 5:6
DOI: 10.4172/2321-6212-C1-009