Electrical and Optical Response Properties of MEH-PPV Semiconductor Polymer Schottky Diodes

Semendy, Fred; Meissner, Greg; Wijewarnasuriya, P. S.

doi:10.21236/ada548948

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…6,7 The MEH-PPV acts as an electron donor (p-type semiconducting polymer) with a relatively low conductivity due to its low hole and electron mobilities when compared to inorganic semiconductor materials. 8,9 Soluble organic semiconductors for OLEDs have received important attention since they offer a potential for the production by solution processing techniques such as spincoating, ink-jet printing or drop casting. 10,11 Within this, the conjugated organic polymers have been generally considered as a suitable material for these techniques because of their good lm forming capacity.…”

Section: Introductionmentioning

confidence: 99%

A low molecular weight OLED material: 2-(4-((2-hydroxyethyl)(methyl)amino)benzylidene)malononitrile. Synthesis, crystal structure, thin film morphology, spectroscopic characterization and DFT calculations

et al. 2019

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Section: Introductionmentioning

confidence: 99%

A low molecular weight OLED material: 2-(4-((2-hydroxyethyl)(methyl)amino)benzylidene)malononitrile. Synthesis, crystal structure, thin film morphology, spectroscopic characterization and DFT calculations

et al. 2019

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“…In our previous studies, we demonstrated MEH-PPV:VOPCPhO [ 11 ] and MEH-PPV:Alq 3 [ 12 ] binary blend-based photodetectors. MEH-PPV exhibits fairly good hole mobility and environmental stability [ 21 ]. However, the photosensitivities and the photo to the dark current ratios of both binary blends-based OPDs were relatively lower.…”

Section: Introductionmentioning

confidence: 99%

PFO-DBT:MEH-PPV:PC71BM Ternary Blend Assisted Platform as a Photodetector

Zafar

Ahmad

Sulaiman

2015

Sensors

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We present a ternary blend-based bulk heterojunction ITO/PEDOT:PSS/PFO-DBT:MEH-PPV:PC71BM/LiF/Al photodetector. Enhanced optical absorption range of the active film has been achieved by blending two donor components viz. poly[2,7-(9,9-di-octyl-fluorene)-alt-4,7-bis(thiophen-2-yl)benzo-2,1,3-thiadiazole] (PFO-DBT) and poly(2-methoxy-5(2′-ethylhexyloxy) phenylenevinylene (MEH-PPV) along with an acceptor component, i.e., (6,6)-phenyl-C71 hexnoic acid methyl ester. The dependency of the generation rate of free charge carriers in the organic photodetector (OPD) on varied incident optical power density was investigated as a function of different reverse biasing voltages. The photocurrent showed significant enhancement as the intensity of light impinging on active area of OPD is increased. The ratio of Ilight to Idark of fabricated device at −3 V was ∼3.5 × 104. The dynamic behaviour of the OPD under on/off switching irradiation revealed that sensor exhibits quick response and recovery time of <800 ms and 500 ms, respectively. Besides reliability and repeatability in the photoresponse characteristics, the cost-effective and eco-friendly fabrication is the added benefit of the fabricated OPD.

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Light and oxygen induce chain scission of conjugated polymers in solution

Louis

Caubergh

Larsson

et al. 2018

Phys. Chem. Chem. Phys.

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Conjugated polymers have been widely studied as flexible, versatile semiconductors in organic electronics. However, the material stability is one of the problems limiting their applications. Thus, understanding the degradation process of conjugated polymers is crucial. In this work, we monitored the chain scission of the model polymer MEH-PPV in chloroform solutions under different conditions by assessing its molecular weight using gel permeation chromatography and optical spectral measurements. We showed that changes in the UV-VIS spectrum can be seen only when the degradation has already progressed substantially. The fluorescence spectrum was found to be almost totally insensitive to the degradation stage of the polymers. We demonstrate that chain scission in solutions happens even in the dark leading to a 15% decrease of the molecular weight after just one day of storage. If exposed to room light, the chain length decreases by about 10 times over one day of exposure. Using stronger light intensity or enriching the solution with oxygen accelerates the degradation process dramatically. The rate of the reaction follows approximately a square root dependence with light intensity and oxygen concentration. We conclude that some extent of polymer degradation is difficult to avoid in common laboratory practices since to prevent it, one needs to work in an oxygen-free atmosphere in the dark. Preparation of polymer films from partially degraded solutions might lead not only to losing the connection between the molecular weight and the opto-electronic properties but also to unintentional doping of the semiconductor by products of chain scission reactions.

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Electrical and Optical Response Properties of MEH-PPV Semiconductor Polymer Schottky Diodes

Cited by 3 publications

References 9 publications

A low molecular weight OLED material: 2-(4-((2-hydroxyethyl)(methyl)amino)benzylidene)malononitrile. Synthesis, crystal structure, thin film morphology, spectroscopic characterization and DFT calculations

A low molecular weight OLED material: 2-(4-((2-hydroxyethyl)(methyl)amino)benzylidene)malononitrile. Synthesis, crystal structure, thin film morphology, spectroscopic characterization and DFT calculations

PFO-DBT:MEH-PPV:PC71BM Ternary Blend Assisted Platform as a Photodetector

Light and oxygen induce chain scission of conjugated polymers in solution

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