Abstract
In this work, The effect of annealing treatment at different temperatures (373, 423 and 473) K and chemical treatment with talwen at different immersion time (40, 60 and 80) min on structural and optical properties of the bulk heterojunction (BHJ) blend copper phthalocyanine tetrasulfonic acid tetrasodium salt/poly dioxyethylenethienylene doped with polystyrenesulphonic acid (CuPcTs/PEDOT:PSS) thin films were investigated. The films were fabricated using spin coating technique. X-ray diffraction (XRD) measurements displayed only one peak at 2θ =4.5o corresponding to (001) direction which has dhkl larger than for standard CuPcTs. The dhkl increase then decrease with increasing annealing temperature andthe time of chemical treatment with talwen. FTIR measurements show that, the peaks for O-H, in general, decrease with increasing annealing temperature, while the peaks corresponding to C=C aromatic bond and C-N bond decrease at 373 K then increase at 423 and 473 K. The peaks for O-H, in general, decrease with increasing immersing time, while the peaks corresponding to C=C aromatic bond and C-N bond decrease at 40 min then increase at more immersing time. From UV-visible measurements, the absorption spectra peaks for B and Q-bands increase at 373K and at 40 min immersing time with talwen and decrease at more annealing or chemical treated time.
Highlights
Over the last two decades, organic semiconductors have more attention because of using in many applications such as gas sensors [1], solar cell [2] and detectors [3], because there chemical variety which can able to change their properties [4].Phthalocyanine has thermal and chemical stability due to its chemical composition
The material convert to amorphous structure at 473 K. It shows that within a low annealing temperature improves the structural properties of the thin film
X-ray diffraction (XRD) measurements show that the dhkl values less than standard CuPcTs values for all samples
Summary
Over the last two decades, organic semiconductors have more attention because of using in many applications such as gas sensors [1], solar cell [2] and detectors [3], because there chemical variety which can able to change their properties [4]. The solubility problem was avoided by using a water-soluble polyelectrolyte, poly (styrene sulfonic acid) (PSS), as the charge-balancing dopant during polymerization to yield PEDOT: PSS. This combination yields a watersoluble polyelectrolyte with a good film forming properties, high conductivity, transmission to visible light, and stability [6]. The properties of organic semiconductor especially phthalocyanine family can be enhance either by thermal [8, 9] or chemical treatment [10, 11]. Structural and optical properties modification of the active layer by immersing with low solubility solvents of talwin (via increment in light absorption or charge transport) improve the device performance [13].
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