Charge Formation Efficiency Helps Choose Materials for Organic Photovoltaics

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

Organic photovoltaic cells hold great promise for conversion of energy. They are flexible and can be produced at low cost, which make them attractive for various applications.

However, their power conversion process is complex, which has been detrimental to their wide adoption.

Researchers from Japan’s University of Tsukuba and the National Institute for Materials Science have developed a novel method for ascertaining the value of charge formation efficiency by combining two techniques - photo-induced spectroscopy and electrochemical spectroscopy.

Absorption changes that occur after femtosecond photo-pulse excitation can be determined using photo-induced spectroscopy, while absorption changes that occur due to charge injection can be determined using electrochemical spectroscopy.

The researchers discovered that in organic photovoltaic devices the charge formation process was quantum mechanical. The charges in such devices, both positive and negative, are bound together as an exciton.

Earlier, without the thermal activation process, this attraction by an electrostatic Coulomb force was considered to be difficult. The present research found that the high charge formation efficiency achieved at low temperatures could be explained theoretically.

This study will help screen organic materials using charge formation efficiency to determine their suitability for organic photovoltaic devices.

Professor Yutaka Moritomo of the Institute of Materials Science at the University of Tsukuba stated that the researchers were analyzing the relation between the structure of the organic photovoltaic devices on a nanoscale level and the charge formation efficiency in order to ascertain how charge formation works.

The researchers have reported their novel method in the Applied Physics Letters.

Source: http://www.aip.org/

Alessandro Pirolini

Written by

Alessandro Pirolini

Alessandro has a BEng (hons) in Material Science and Technology, specialising in Magnetic Materials, from the University of Birmingham. After graduating, he completed a brief spell working for an aerosol manufacturer and then pursued his love for skiing by becoming a Ski Rep in the Italian Dolomites for 5 months. Upon his return to the UK, Alessandro decided to use his knowledge of Material Science to secure a position within the Editorial Team at AZoNetwork. When not at work, Alessandro is often at Chill Factore, out on his road bike or watching Juventus win consecutive Italian league titles.

Citations

Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Pirolini, Alessandro. (2014, August 21). Charge Formation Efficiency Helps Choose Materials for Organic Photovoltaics. AZoM. Retrieved on September 23, 2019 from https://www.azom.com/news.aspx?newsID=42240.

  • MLA

    Pirolini, Alessandro. "Charge Formation Efficiency Helps Choose Materials for Organic Photovoltaics". AZoM. 23 September 2019. <https://www.azom.com/news.aspx?newsID=42240>.

  • Chicago

    Pirolini, Alessandro. "Charge Formation Efficiency Helps Choose Materials for Organic Photovoltaics". AZoM. https://www.azom.com/news.aspx?newsID=42240. (accessed September 23, 2019).

  • Harvard

    Pirolini, Alessandro. 2014. Charge Formation Efficiency Helps Choose Materials for Organic Photovoltaics. AZoM, viewed 23 September 2019, https://www.azom.com/news.aspx?newsID=42240.

Tell Us What You Think

Do you have a review, update or anything you would like to add to this news story?

Leave your feedback
Submit