About
29
Publications
2,584
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
902
Citations
Publications
Publications (29)
Solution-based electrical doping of organic semiconductors using 12-molybdophosphoric acid (PMA) hydrate has been shown to allow p-type doping of conjugated polymers over a limited depth from the surface, enabling the fabrication of organic solar cells with a simplified device architecture. However, the doping level of certain conjugated polymers u...
We present an overview of solution-based electrical p -doping of organic semiconductors using polyoxometalates yielding stable exponentially decaying depth-profiles into the bulk and other highly desirable properties for the realization of organic photovoltaics.
We report on the application of solution-based p-type electrical doping using 12-molybdophosphoric acid hydrate (PMA) to the fabrication of organic tandem solar cells. Such a doping approach leads to a spatially confined vertical doping profile down to a limited depth from the surface of polymer films, thus allowing the hole-collecting component of...
Soft and stretchable semiconductors could enable seamless integration of wearable or implantable sensors with biological systems. We report on flexible and stretchable organic photodiodes with silicon-photodetector like performance and applications in biometric monitoring.
Stretchable optoelectronics made of elastomeric semiconductors could enable the integration of intelligent systems with soft materials, such as those of the biological world. Organic semiconductors and photodiodes have been engineered to be elastomeric; however, for photodetector applications, it remains a challenge to identify an elastomeric bulk...
Doping is an effective strategy to tune the electrical properties of organic semiconductors. Traditional solution‐processed doping methods, including “host‐dopant mixing‐doping” and “post‐fabrication doping” methods, present challenges for their use in applications in optoelectronic devices. This work reports about a novel method to prepare electri...
An improved characterization of organic photodiode performance enables a reassessment of electronic noise and optimization of large-area organic photodetectors that at visible wavelengths are comparable to low-noise silicon photodiodes in all metrics except response time.
Low-noise organic photodetectors
Although the high performance and low cost of visible light silicon photodetectors suffice for most applications, their small size and rigid nature are not optimal for applications such as wearable sensors. Organic photodetectors can be flexible and large in area but are often noisy. Fuentes-Hernandez et al. found t...
The field of organic electronics aspires to enable the fabrication of low-cost, solution-processed optoelectronic devices with unique mechanical, electrical, optical and chemical properties. Critical to the success of these aspirations is the ability to fabricate controlled doping profiles vertically or laterally (i.e., to a limited depth or area e...
The printed electronics industry offers a paradigm change in manufacturing, cost and environmental impact when compared to the conventional semiconductor industry. Printed electronic devices are expected to be mass-produced from less-energy-demanding processes over large areas and on flexible substrates, with techniques that closely resemble the we...
The immersion of polymeric semiconducting films into a polyoxometalate (PMA) solution was found to lead to electrical doping over a limited depth, enabling the fabrication of organic photovoltaic devices with simplified geometry; yet, the technique was highly solvent selective and the use of nitromethane was found limiting. Here, we report on the u...
We report on the fabrication and characterization of organic field-effect transistors using the small molecule electron acceptor 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis (4-hexylphenyl)-dithieno [2,3-d:2′,3′-d’]-s-indaceno [1,2-b:5,6-b’]dithiophene (ITIC). These experiments carried out in unipolar n-channel transi...
Solution-based electrical doping protocols may allow more versatility in the design of organic electronic devices; yet, controlling the diffusion of dopants in organic semiconductors and their stability has proven challenging. Here we present a solution-based approach for electrical p-doping of films of donor conjugated organic semiconductors and t...
We report on the reduction of contact resistance in solution-processed TIPS-pentacene (6,13-bis(triisopropylsilylethynyl)pentacene) and PTAA (poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine]) top-gate bottom-contact organic field-effect transistors (OFETs) by using different contact-modification strategies. The study compares the contact resistance...
We report on self-forming electrode modification by mixing 2,3,4,5,6-pentafluorothiophenol (PFBT) directly into the solution of the organic semiconductor prior to film formation on top of existing metal electrodes. During the formation of the semiconductor layer from the mixed solution, PFBT chemisorbs on the underlying source/drain electrodes and...
Presently, more than 7 million Haitians have no access to power nor basic energy related services. Available generation capacity of Haiti reaches 212 MW, which is insufficient to meet the estimated peak demand of more than 500 MW in the whole country. This deficit severely impacts basic essential facilities such as health care centers. The IEEE Stu...
This paper presents a methodology to assess operating reserves in isolated power systems under high penetration of wind power. The methodology is based on a convolution approach that merges the fluctuations of wind speed with the natural variations of demand, and formulates the probability distribution function of variables as a non-Gaussian behavi...
The integration of intermittent generation in power grids, such as wind energy, imposes new challenges for transmission congestion management. In order to solve this problem, energy storage systems (ESS) have been proposed in the literature, as they provide an efficient mechanism for balancing variability while reducing operational costs. This pape...
This paper presents a simplified methodology to estimate the impact of wind power over operating reserves in isolated power systems. The methodology is based on a convolution approach that merges the fluctuations of wind speed with the natural variations of demand, and formulates the probability distribution function of variables as a non-Gaussian...