Featured Research

from universities, journals, and other organizations

Dye absorption structure of dye-sensitized solar cells elucidated on molecular level: Success in dye absorption structure control

Date:
November 13, 2013
Source:
National Institute for Materials Science
Summary:
Researchers have elucidated the relationship between the photocurrent and the peculiar changes in the absorption structure occurring in the vicinity of the molecular-electrode interface in dye-sensitized solar cells.

NIMS researchers elucidated the relationship between the photocurrent and the peculiar changes in the absorption structure occurring in the vicinity of the molecular-electrode interface in dye-sensitized solar cells.

Related Articles


The Organic/Inorganic Hybrid Photovoltaics Group of the NIMS, Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN), elucidated the relationship between the photocurrent and the peculiar changes in the absorption structure occurring in the vicinity of the molecular-electrode interface in dye-sensitized solar cells, by conducting a soft X-ray radiation experiment at the High Energy Accelerator Research Organization (KEK).

A research group led by Dr. Mitsunori Honda (post-doctoral researcher; currently a fixed-term researcher at the Quantum Beam Science Directorate R&D Directory of the Japan Atomic Agency (JAEA)) and Dr. Masatoshi Yanagida (Group Leader) of the Organic/Inorganic Hybrid Photovoltaics Group of the Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN; headed by Director-General Kohei Uosaki) of the National Institute for Materials Science (NIMS; headed by President Sukekatsu Ushioda) elucidated the relationship between the photocurrent and the peculiar changes in the absorption structure occurring in the vicinity of the molecular-electrode interface in dye-sensitized solar cells, by conducting a soft X-ray radiation experiment at the High Energy Accelerator Research Organization (KEK).

Dye-sensitized solar cells attract attention as a low-cost and high-flexibility type of next-generation solar cells. However, for their commercial application, it is necessary to achieve higher photoelectric conversion efficiency (especially in terms of the photocurrent) beyond the presently available level. In dye-sensitized solar cells, since dyes absorb light and separate charges, the photocurrent is thought to be dependent on the dye absorption structure, and therefore elucidation and control of the absorption structure on real devices are indispensable for increasing the conversion efficiency.

The research group analyzed the absorption structure of N719, a ruthenium metal complex dye, using X‐ray photoelectron spectroscopy and X-ray absorption near edge structure analysis for investigating the electronic structure of dye molecules. Normally, N719 dye is absorbed on the TiO2 surface via a carboxyl (COOH) group. However, the experiment result showed that there was a strong interaction between NCS- (thiocyanate ligand) and TiO2. Such an absorption structure had not been taken into consideration in the previous model but might have impeded the photocurrent.

The experiment also revealed that the strong interaction between NCS- and TiO2 would disappear upon simultaneous absorption of D131 dye (a dye that demonstrates strong light absorption properties within the short wavelength range and is widely used as a co-absorption agent). The research team controlled the optimal absorption structure based on this experiment result and found that the external quantum efficiency would increase in the visible light range of solar cells (about a 0.3% increase in the photoelectric conversion efficiency under sunlight.)


Story Source:

The above story is based on materials provided by National Institute for Materials Science. Note: Materials may be edited for content and length.


Journal Reference:

  1. Mitsunori Honda, Masatoshi Yanagida, Liyuan Han, Kenjiro Miyano. X-ray Characterization of Dye Adsorption in Coadsorbed Dye-Sensitized Solar Cells. The Journal of Physical Chemistry C, 2013; 117 (33): 17033 DOI: 10.1021/jp404572y

Cite This Page:

National Institute for Materials Science. "Dye absorption structure of dye-sensitized solar cells elucidated on molecular level: Success in dye absorption structure control." ScienceDaily. ScienceDaily, 13 November 2013. <www.sciencedaily.com/releases/2013/11/131113091134.htm>.
National Institute for Materials Science. (2013, November 13). Dye absorption structure of dye-sensitized solar cells elucidated on molecular level: Success in dye absorption structure control. ScienceDaily. Retrieved October 24, 2014 from www.sciencedaily.com/releases/2013/11/131113091134.htm
National Institute for Materials Science. "Dye absorption structure of dye-sensitized solar cells elucidated on molecular level: Success in dye absorption structure control." ScienceDaily. www.sciencedaily.com/releases/2013/11/131113091134.htm (accessed October 24, 2014).

Share This



More Matter & Energy News

Friday, October 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

3D Printed Instruments Make Sweet Music in Sweden

3D Printed Instruments Make Sweet Music in Sweden

Reuters - Innovations Video Online (Oct. 23, 2014) Students from Lund University's Malmo Academy of Music are believed to be the world's first band to all use 3D printed instruments. The guitar, bass guitar, keyboard and drums were built by Olaf Diegel, professor of product development, who says 3D printing allows musicians to design an instrument to their exact specifications. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Chameleon Camouflage to Give Tanks Cloaking Capabilities

Chameleon Camouflage to Give Tanks Cloaking Capabilities

Reuters - Innovations Video Online (Oct. 22, 2014) Inspired by the way a chameleon changes its colour to disguise itself; scientists in Poland want to replace traditional camouflage paint with thousands of electrochromic plates that will continuously change colour to blend with its surroundings. The first PL-01 concept tank prototype will be tested within a few years, with scientists predicting that a similar technology could even be woven into the fabric of a soldiers' clothing making them virtually invisible to the naked eye. Matthew Stock reports. Video provided by Reuters
Powered by NewsLook.com
Jet Sales Lift Boeing Profit 18 Pct.

Jet Sales Lift Boeing Profit 18 Pct.

Reuters - Business Video Online (Oct. 22, 2014) Strong jet demand has pushed Boeing to raise its profit forecast for the third time, but analysts were disappointed by its small cash flow. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Internet of Things Aims to Smarten Your Life

Internet of Things Aims to Smarten Your Life

AP (Oct. 22, 2014) As more and more Bluetooth-enabled devices are reaching consumers, developers are busy connecting them together as part of the Internet of Things. (Oct. 22) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins