The University of Tsukuba, Japan announced on August 20 that it has established a method for determining the absolute value of the "charge generation efficiency" of organic thin-film solar cells. Charge generation efficiency refers to the “probability of electrons generated by one photonâ€, and the absolute value of this physical quantity cannot be evaluated before. It also said that new techniques can be used to screen high-efficiency solar cell materials, and it is also possible to identify the energy conversion process of organic solar cells.
This is the research result of the R&D team composed of Prof. Satoshi Koyo of the Department of Mathematical and Physical Sciences at the University of Tsukuba and Yasuda Anda, director of the Photovoltaic Power Materials Group at the Japan Material Research Institute. By using a combination of ultra-fast spectroscopic and electrochemical doping methods, a method for determining the absolute value of charge generation efficiency was found.
It has been reported that the energy conversion efficiency of organic thin-film solar cells can exceed 11%, so it is expected to become a new generation of solar cells. In such a solar cell, after the sunlight enters, the light energy is converted into an electric energy source by a complex process such as the generation of excitons, the generation of charges on the surface of the molecule, and the movement of the molecules toward the collector. However, it was impossible to quantitatively separate the processes of these units. The R&D team successfully achieved a quantitative assessment of the charge generation efficiency on the surface of the molecule by using a combination of ultra-high-speed spectroscopic and electrochemical doping methods.
In the future, this assessment method will be used to identify the energy conversion mechanism of organic thin-film solar cells to develop efficient organic solar cells.
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