Improvement of photoelectrochemical and optical characteristics of MEH-PPV using titanium dioxide nanoparticles

Habelhames, Farid; Lamiri, Leila; Zerguine, Wided; Nessark, Belkacem

doi:10.1016/j.mssp.2012.12.015

Cited by 16 publications

(5 citation statements)

References 39 publications

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“…It is obtained by extrapolating the linear region of CV curve. It can be observed from figure 9 that the current intensity increases with the incorporation of SnO 2 nanoparticles which suggests an increase in the conductivity of the Sn PPV nanocomposite sample [15]. The higher anodic current of oxidation peak of Sn PPV in comparison to Ti PPV is observed because electrons immediately level the LUMO of MEH-PPV [42].…”

Section: Resultsmentioning

confidence: 91%

“…Hence, the physical properties of the inorganic semiconductor such as energy level alignment with conjugated polymer, defect states, charge mobility and interfacial interactions are significant while opting for an active layer in PSCs [11]. The use of various inorganic nanoparticles such as CdSe [10], CdTe [4], InP [12], GaAs [13] and PbS [14] were reported and a variety of nanostructured ZnO and TiO 2 were also examined extensively [15]. But, both ZnO (−7.6 eV) and TiO 2 (−7.4 eV) do not possess a deep valance band for effective hole blocking.…”

Section: Introductionmentioning

confidence: 99%

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Study on interfacial interactions and optoelectronic properties of MEH-PPV/SnO₂ hetero-structure

Kumar¹,

Shankar²,

Bhuvana³

2022

Semicond. Sci. Technol.

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The exciton dynamics in nanocomposites of tin oxide (SnO2) nanoparticles with a conjugated polymer (poly (2-methoxy-5-(2’-ethylhexyloxy) 1,4-phenylenevinylene) (MEH-PPV) have been investigated by steady-state, time-resolved photoluminescence (PL) spectroscopy and cyclic voltammetry analysis. SnO2 is an air-stable, optically transparent, electrically conductive deep valance band metal oxide which is suitable as an electron-accepting material in organic photovoltaics (OPVs). Results reveals that SnO2 is an efficiency electron-accepting material in comparison with titanium dioxide (TiO2) nanoparticles. Efficiency charge separation takes places at SnO2/MEH-PPV interfaces when the polymer is excited, leading to enhancement in quenching of photoluminescence efficiency (10 %) and shortening of the measured PL lifetime. In addition, the reduction in recombination rate of MEH-PPV/SnO2 nanocomposite show that the incorporation of nanoparticles in the polymer chain reduce disorder in polymer chain. The blue-shift in the absorbance and emission maxima denotes that the process of in-situ polymerization resulted in shortening in conjugation of polymer chain. The electrochemical analysis for MEH-PPV/SnO2 nanocomposites shows increase in current density compared to MEH-PPV/TiO2 and pristine MEH-PPV. Moreover, the PL degradation experiments showed that MEH-PPV/SnO2 exhibited enhanced stability. MEH-PPV/SnO2 film attained 50% of the original intensity in ~ 10 days, while pristine MEH-PPV and MEH-PPV/TiO2 exhibited half-life of ~ 5 days when exposed to an ambient environment. The effect of TiO2 nanoparticles to stabilize MEH-PPV is though less important than that of SnO2. Thus MEH-PPV/SnO2 nanocomposite with enhanced absorbance, conductivity, stability and low bandgap formed an effective type-II band structure suitable for the photovoltaic active layer.

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Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Study on interfacial interactions and optoelectronic properties of MEH-PPV/SnO₂ hetero-structure

Kumar¹,

Shankar²,

Bhuvana³

2022

Semicond. Sci. Technol.

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“…7 shows the photocurrent density as function of applied potential (−1 to 1 V (vs. SCE)) of MEH-PPV/PCBM +(6 wt.% n-TiO 2 )/ITO electrode obtained at light intensity of 100 mW/cm 2 . It was observed that the photocurrent of the composite with inorganic semiconductor nanoparticles (TiO 2 ) at all range of potential was negative and higher than of non-modified polymers [25,27] . This response indicates that recombination processes occur in the film, probably due to the presence of charge carriers in the polymer bulk, mainly due to structural disorder.…”

Section: Meh-ppv/pcbmmentioning

confidence: 99%

Morphology and photoelectrochemical characterization of MEH-PPV/PCBM composite film doped with TiO2 nanoparticles

et al. 2013

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Poly[2-methoxy-5-(20-ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV), [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) and titanium dioxide (TiO 2) nanoparticles (n-type) were dissolved, mixed and deposited by physical methods (spin-coating) on indium tin-oxide (ITO) substrate. The incorporation of the titanium dioxide nanoparticles changed the morphology and increased the roughness of polymers film (MEH-PPV/PCBM), and the photocurrent density of the composite (MEH-PPV/PCBM +n-TiO 2) was higher than that of single MEH-PPV/PCBM film. The study showed that the presence of n-TiO 2 particles in the polymeric film improves the photoelectrochemical properties of MEH-PPV/PCBM composite.

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“…Among those conjugated polymers, poly(p-phenylene-vinylene) (PPV) and its derivatives are one of the most studied classes of polymers due to their interesting electrical and optoelectrical properties, especially because of high reproducibility with respect to synthesis and optical properties [5]. Despite all those characteristics, PPV-type polymers have been consecutively replaced in organic electronic device applications due to their comparatively lower efficiency and due to some chemical and thermal instability [6][7][8]. There are two promising approaches to enhance the application of PPV-type polymers: (i) attachment of strongly electrophilic moieties like cyano or fluorine to the polymeric backbone, such moieties increase the stability of the double bond to photooxidation [9]; and (ii) creation of copolymers that have a donor-acceptor (D-A) structure.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the photocurrent value for poly(2,5-dicyano- p -phenylene-vinylene)-co-(p-phenylene-vinylene) (DCN-PPV/PPV)

Santos

Bertuzzi

Pedroso

et al. 2016

J Solid State Electrochem

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A method to obtain poly(2,5-dicyano-p-phenylenevinylene)-co-(p-phenylene-vinylene) (DCN-PPV/PPV) block copolymer was developed. The structural characteristics of the copolymer and its capability to generate a photocurrent were evaluated. IR spectra indicate the complete conversion of precursor copolymer into DCN-PPV/PPV at 250°C under lowpressure conditions. The DCN-PPV/PPV polymer optical band gap was determined based on the observed UV-Vis spectral data by using Tauc's equation. The two linear regions in the Tauc curve (E g = 2.63 eVand 2.02) revealed the formation of a block copolymer. Thermal analysis showed that DCN-PPV/PPV has a higher stability than PPV and starts to degrade at 317°C in air. The electronic parameters of DCN-PPV/PPV (IP = 5.25 eV, EA = 3.30 eV, and E g = 1.95 eV) indicate that the cyano groups reduce the LUMO energy level without affecting the HOMO energy by much. DCN-PPV/PPV photoactivity measurements show higher photocurrent values compared to those for PPV.

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Improvement of photoelectrochemical and optical characteristics of MEH-PPV using titanium dioxide nanoparticles

Cited by 16 publications

References 39 publications

Study on interfacial interactions and optoelectronic properties of MEH-PPV/SnO₂ hetero-structure

Study on interfacial interactions and optoelectronic properties of MEH-PPV/SnO₂ hetero-structure

Morphology and photoelectrochemical characterization of MEH-PPV/PCBM composite film doped with TiO2 nanoparticles

Evaluation of the photocurrent value for poly(2,5-dicyano- p -phenylene-vinylene)-co-(p-phenylene-vinylene) (DCN-PPV/PPV)

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Improvement of photoelectrochemical and optical characteristics of MEH-PPV using titanium dioxide nanoparticles

Cited by 16 publications

References 39 publications

Study on interfacial interactions and optoelectronic properties of MEH-PPV/SnO2 hetero-structure

Study on interfacial interactions and optoelectronic properties of MEH-PPV/SnO2 hetero-structure

Morphology and photoelectrochemical characterization of MEH-PPV/PCBM composite film doped with TiO2 nanoparticles

Evaluation of the photocurrent value for poly(2,5-dicyano- p -phenylene-vinylene)-co-(p-phenylene-vinylene) (DCN-PPV/PPV)

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Study on interfacial interactions and optoelectronic properties of MEH-PPV/SnO₂ hetero-structure

Study on interfacial interactions and optoelectronic properties of MEH-PPV/SnO₂ hetero-structure