Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Solar Cells Will be Fabricated by a Single Organic Semiconductor

29.03.2011
The fabrication of organic thin-film solar cells has been simplified due to new research findings. Where previously two types of organic semiconductors were required, doping the semiconductor fullerene with molybdenum oxide renders the use of phthalocyanine unneccessary.

The Institute for Molecular Science, National Institute of Natural Sciences announced on March 3, 2011 that a research group led by Professor Masahiro Hiramoto has succeeded in converting conduction-type of fullerene from n- to p-type by molybdenum oxide (MoO3) doping. Details are published online in Applied Physics Letters on February 28, 2011*.

Although organic thin-film solar cells are promising devices because of the advantages of being light weight, flexible and low cost, the conduction-type of organic semiconductors has not been controlled by doping impurities as is done in silicon. Two species of organic semiconductors, n-type fullerene (C60) and p-type phthalocyanine (Pc), need to be used to form built-in fields in solar cells.

Researchers noticed that MoO3 is used to raise holes in organic electroluminescent materials. They have succeeded in converting conduction-type of C60 from n- to p-type by co-evaporation of MoO3 and C60. Energetic value of the Fermi level, 4.60eV, for nondoped C60 films measured by the Kelvin vibrating capacitor method was positively shifted to 5.88 eV by the co-evaporated doping of MoO3 at a concentration of 3300 ppm and approached the valence band of located at 6.4 eV. The upward bending of energy band in the Schottky junction formed at the interface between a metal (silver, Ag) and p-type C60 film formed by MoO3 doping was confirmed based on the photovoltaic properties. Organic solar cells could be fabricated by a single material - fullerene C60.

Journal information

*Masayuki Kubo, Kai Iketaki, Toshihiko Kaji, and Masahiro Hiramoto, "Conduction-type control of fullerene films from n- to p-type by molybdenum oxide doping", Applied Physics Letters Vol.98, No. 7, p. 073311 (2011); doi:10.1063/1.3556312 (3 pages); published online 18 February 2011.

Mikiko Tanifuji | Research asia research news
Further information:
http://nanonet.nims.go.jp/english/modules/news/article.php?a_id=743
http://www.researchsea.com

More articles from Materials Sciences:

nachricht ADIR Project: Lasers Recover Valuable Materials
21.07.2017 | Fraunhofer-Institut für Lasertechnik ILT

nachricht High-tech sensing illuminates concrete stress testing
20.07.2017 | University of Leeds

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Manipulating Electron Spins Without Loss of Information

Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.

For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...

Im Focus: The proton precisely weighted

What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.

To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...

Im Focus: On the way to a biological alternative

A bacterial enzyme enables reactions that open up alternatives to key industrial chemical processes

The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....

Im Focus: The 1 trillion tonne iceberg

Larsen C Ice Shelf rift finally breaks through

A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...

Im Focus: Laser-cooled ions contribute to better understanding of friction

Physics supports biology: Researchers from PTB have developed a model system to investigate friction phenomena with atomic precision

Friction: what you want from car brakes, otherwise rather a nuisance. In any case, it is useful to know as precisely as possible how friction phenomena arise –...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Closing the Sustainability Circle: Protection of Food with Biobased Materials

21.07.2017 | Event News

»We are bringing Additive Manufacturing to SMEs«

19.07.2017 | Event News

The technology with a feel for feelings

12.07.2017 | Event News

 
Latest News

Chances to treat childhood dementia

24.07.2017 | Health and Medicine

Improved Performance thanks to Reduced Weight

24.07.2017 | Automotive Engineering

NASA looks to solar eclipse to help understand Earth's energy system

21.07.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>