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Organic photovoltaic cells of the future: Using charge formation efficiency to screen materials for future devices

Date:
August 19, 2014
Source:
American Institute of Physics
Summary:
Organic photovoltaic cells -- a type of solar cell that uses polymeric materials to capture sunlight -- show tremendous promise as energy conversion devices, thanks to key attributes such as flexibility and low-cost production, but have complex power conversion processes. To maneuver around this problem, researchers have developed a method to determine the absolute value of the charge formation efficiency. The secret of their method is the combination of two types of spectroscopy.

Researchers develop method to screen organic materials for organic photovoltaic cells by charge formation efficiency.
Credit: Yutaka Moritomo/University of Tsukuba

Organic photovoltaic cells -- a type of solar cell that uses polymeric materials to capture sunlight -- show tremendous promise as energy conversion devices, thanks to key attributes such as flexibility and low-cost production.

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But one giant hurdle holding back organic photovoltaic technologies have been the complexity of their power conversion processes, which involve separate charge formation and transport processes.

To maneuver around this problem, a team of researchers in Japan has developed a method to determine the absolute value of the charge formation efficiency. The secret of their method, as they report in Applied Physics Letters, is the combination of two types of spectroscopy.

The two types the team uses are photo-induced spectroscopy to determine the change in absorption after femtosecond photo-pulse excitation, and electrochemical spectroscopy to examine the absorption change due to charge injection. "By qualitative analysis of the spectral change, we can deduce how many charges are produced by one photon -- its charge formation efficiency," said Professor Yutaka Moritomo, Institute of Materials Science at the University of Tsukuba.

Just how significant is this? It's a huge step forward, said Moritomo, and the team also discovered that the charge formation efficiency remains high (0.55) even at low temperatures (80 K).

"This was extremely surprising," Moritomo said, since the positive and negative charges are strongly bound in an organic photovoltaic device as an exciton -- a bound state of an electron and hole, which are attracted to each other by the electrostatic Coulomb force. "Its charge formation was believed to be too difficult without a thermal activation process," explained Moritomo. "But our work shows that the charge formation process of an organic photovoltaic device is purely quantum mechanical, and any theoretical model should explain the high charge formation efficiency at low temperatures."

The team's work will enable the high-throughput screening of organic materials for new organic photovoltaic devices. "Organic materials have several requirements -- including high charge formation efficiency and high charge transport efficiency -- so our method can be used to quickly screen the materials by charge formation efficiency," Moritomo said.

Next for the team? "Now that we have a method to determine the key physical parameter, charge formation efficiency, we're exploring the interrelation between it and the nanoscale structure of the organic photovoltaic device to clarify the mechanism of the charge formation," noted Moritomo.

The article, "Effect of temperature on carrier formation efficiency in organic photovoltaic cells," is authored by Yutaka Moritomo, Kouhei Yonezawa and Takeshi Yasuda. It will appear in the journal Applied Physics Letters on August 19, 2014.


Story Source:

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


Journal Reference:

  1. Yutaka Moritomo, Kouhei Yonezawa, Takeshi Yasuda. Effect of temperature on carrier formation efficiency in organic photovoltaic cells. Applied Physics Letters, 2014; 105 (7): 073902 DOI: 10.1063/1.4892611

Cite This Page:

American Institute of Physics. "Organic photovoltaic cells of the future: Using charge formation efficiency to screen materials for future devices." ScienceDaily. ScienceDaily, 19 August 2014. <www.sciencedaily.com/releases/2014/08/140819112956.htm>.
American Institute of Physics. (2014, August 19). Organic photovoltaic cells of the future: Using charge formation efficiency to screen materials for future devices. ScienceDaily. Retrieved March 29, 2015 from www.sciencedaily.com/releases/2014/08/140819112956.htm
American Institute of Physics. "Organic photovoltaic cells of the future: Using charge formation efficiency to screen materials for future devices." ScienceDaily. www.sciencedaily.com/releases/2014/08/140819112956.htm (accessed March 29, 2015).

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