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The relationship between the theoretical limit value of the photoelectric conversion efficiency and the minimum value of the light energy absorbable by the solar cell (light absorption end energy) in the case where there is a 0.4 eV energy loss at the time of charge separation. The red line indicates the theoretical limit of inorganic solar cells and the blue line indicates the new theoretical limit value of organic solar cells.
In regard to the "organic solar cells" that are attracting attention as a new generation of solar cells, the Japan Industrial Technology Research Institute (Institute for Research and Development) has the ability to convert sunlight into electricity using this type of battery - "photoelectric conversion efficiency" (hereinafter referred to as conversion). The theoretical limit of efficiency was simulated and the gas value was found to be approximately 21%.
Japan is focusing on the research and development center for solar energy power generation engineering. It gathers researchers from a variety of fields such as environment, energy, measurement and measurement standards, nanotechnology, materials, and manufacturing to form an organic solar cell ultimate efficiency seminar, and conducts conversion efficiency of organic solar cells. The study of theoretical limits. The theoretically calculated limit of about 21% is higher than the actual efficiency of 10-12% that can be achieved so far, indicating that in the future, by selecting and improving materials and optimizing the structure, it is hoped that the conversion efficiency will be further improved.
At present, the theoretical limits of conversion efficiency of inorganic solar cells such as crystalline silicon solar cells have been known. This time, based on this, and taking into account the differences in the mechanism of inorganic solar cells and organic solar cells generating electricity after absorbing light, the theoretical limit values ​​of the conversion efficiency of organic solar cells were calculated. This result is expected to become a guideline for R&D of “how much can be improved†for the conversion efficiency of organic solar cells. The above results will be disclosed in the online version of the Applied Physics Letters, a journal of the Applied Physics Society.
Organic solar cells have the characteristic of thin, light, soft and soft that is unique to organic materials. They can be installed in locations where conventional crystalline silicon solar panels are difficult to install, and are expected as a new generation of solar cells. However, compared with crystalline silicon solar cells, organic solar cells still have technical problems in improving conversion efficiency and durability. However, in recent years, its conversion efficiency has rapidly increased. Some studies have said that it has exceeded 10%, and reached the same level as amorphous silicon solar cells. Therefore, the industry is concerned about the "how much can be improved" in the conversion efficiency of organic solar cells.
In inorganic semiconductor solar cells, Shockley and Queisser announced in 1961 that the theoretical limit of their conversion efficiency is about 30%, and the actual efficiency in recent years has approached this value. The research and development of inorganic solar cells is currently moving towards adopting multi-junction type. In the Shockley-Queisser theory, such as the lumped light type, the structure has not been considered to improve the efficiency. On the other hand, the conversion efficiency of organic solar cells is also rapidly increasing, and it has reached the level that needs to be promoted based on the “how much can be improved†guideline. Therefore, the industry hopes to obtain limit efficiency data like the Shockley-Queisser theory.
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