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.

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 July 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 July 24, 2014).

Share This




More Matter & Energy News

Thursday, July 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

TSA Administrator on Politics and Flight Bans

TSA Administrator on Politics and Flight Bans

AP (July 24, 2014) TSA administrator, John Pistole's took part in the Aspen Security Forum 2014, where he answered questions on lifting of the ban on flights into Israel's Tel Aviv airport and whether politics played a role in lifting the ban. (July 24) Video provided by AP
Powered by NewsLook.com
Creative Makeovers for Ugly Cellphone Towers

Creative Makeovers for Ugly Cellphone Towers

AP (July 24, 2014) Mobile phone companies and communities across the country are going to new lengths to disguise those unsightly cellphone towers. From a church bell tower to a flagpole, even a pencil, some towers are trying to make a point. (July 24) Video provided by AP
Powered by NewsLook.com
Algonquin Power Goes Activist on Its Target Gas Natural

Algonquin Power Goes Activist on Its Target Gas Natural

TheStreet (July 23, 2014) When The Deal's Amanda Levin exclusively reported that Gas Natural had been talking to potential suitors, the Ohio company responded with a flat denial, claiming its board had not talked to anyone about a possible sale. Lo and behold, Canadian utility Algonquin Power and Utilities not only had approached the company, but it did it three times. Its last offer was for $13 per share as Gas Natural's was trading at a 60-day moving average of about $12.50 per share. Now Algonquin, which has a 4.9% stake in Gas Natural, has taken its case to shareholders, calling on them to back its proposals or, possibly, a change in the target's board. Video provided by TheStreet
Powered by NewsLook.com
Robot Parking Valet Creates Stress-Free Travel

Robot Parking Valet Creates Stress-Free Travel

AP (July 23, 2014) 'Ray' the robotic parking valet at Dusseldorf Airport in Germany lets travelers to avoid the hassle of finding a parking spot before heading to the check-in desk. (July 23) 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:
from the past week

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