The study resolves some of the discrepancies found between experimental results from previously published studies and highlights that processing and molecular weight need to be carefully controlled to ensure maximum solar cell performance.
Teams led by Natalie Stingelin from Imperial College, London and Garry Rumbles from the National Renewable Energy Lab in Boulder, Colorado collaborated on the work to study the generation of charge carriers in neat poly(3-hexylthiophene) (P3HT) solar cells and how it depends on the polymer solid-state microstructure.
They are able to control the morphology from stacked, non-entangled chains in low-molecular-weight P3HT through to mixed stacked and amorphous, entangled phases in samples with higher molecular weight. The researchers find that it is easiest to separate charges when there are both crystalline and amorphous regions.
In previous studies on P3HT, other researchers have found yields of free charges appearing after photoexcitation can vary enormously between 1% and 15%; this work reveals that different polymer microstructures could account for that variation.
Obadiah G. Reid, Jennifer A. Nekuda Malik, Gianluca Latini, Smita Dayal, Nikos Kopidakis, Carlos Silva, Natalie Stingelin, and Garry Rumbles, “The influence of solid-state microstructure on the origin and yield of long-lived photogenerated charge in neat semiconducting polymers”, J. Polym. Sci. Part B: Polym. Phys., 2011, DOI: 10.1002/polb.22379.
This article is available online at http://onlinelibrary.wiley.com/doi/10.1002/polb.22379/abstract.
Carmen Teutsch | Wiley-VCH
From ancient fossils to future cars
21.10.2016 | University of California - Riverside
Study explains strength gap between graphene, carbon fiber
20.10.2016 | Rice University
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
By forcefully embedding two silicon atoms in a diamond matrix, Sandia researchers have demonstrated for the first time on a single chip all the components needed to create a quantum bridge to link quantum computers together.
"People have already built small quantum computers," says Sandia researcher Ryan Camacho. "Maybe the first useful one won't be a single giant quantum computer...
COMPAMED has become the leading international marketplace for suppliers of medical manufacturing. The trade fair, which takes place every November and is co-located to MEDICA in Dusseldorf, has been steadily growing over the past years and shows that medical technology remains a rapidly growing market.
In 2016, the joint pavilion by the IVAM Microtechnology Network, the Product Market “High-tech for Medical Devices”, will be located in Hall 8a again and will...
'Ferroelectric' materials can switch between different states of electrical polarization in response to an external electric field. This flexibility means they show promise for many applications, for example in electronic devices and computer memory. Current ferroelectric materials are highly valued for their thermal and chemical stability and rapid electro-mechanical responses, but creating a material that is scalable down to the tiny sizes needed for technologies like silicon-based semiconductors (Si-based CMOS) has proven challenging.
Now, Hiroshi Funakubo and co-workers at the Tokyo Institute of Technology, in collaboration with researchers across Japan, have conducted experiments to...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
21.10.2016 | Health and Medicine
21.10.2016 | Information Technology
21.10.2016 | Materials Sciences