Sumitomo Chemical has developed an organic thin-film solar cell with excellent transparency and has been exhibited at the "People and Vehicle Technology Exhibition 2014" (May 21-23, 2014, Pacific Yokohama International Convention and Exhibition Center) to confirm this Potential demand for products in automotive windows and roofs.

Sumitomo Chemical Co., Ltd. displayed an organic thin-film solar cell with a light transmittance of approximately 50% and a size of 20 cm square. The conversion efficiency is about half of the R&D level efficiency of opaque organic thin film solar cells. The narrator said confidently: “We only have one of usable organic thin-film solar cells with a light transmittance and conversion efficiency of 20 cm.

In order to suppress the reduction of the conversion efficiency while increasing the light transmittance, this product employs a long-wavelength absorbing material that generates electricity with a wavelength of 900 nm or more that is invisible to the naked eye. In the future, through the improvement of this long-wavelength absorbing material, "it is also expected to realize completely transparent solar cells" (narrator).

Sumitomo Chemical announced in February 2012 that organic thin-film solar cells using materials developed by the company achieved a conversion efficiency of 10.6%. This presentation did not mark the efficiency of the conversion but emphasized the transparency. In this regard, the narrator said: "Although companies have announced the results of conversion efficiency of more than 10%, but did not promote the popularization of organic thin film solar cells. Users do not pay attention to conversion efficiency, the need to have the characteristics of other than conversion efficiency."

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