In collaboration with researchers at the University of Tokyo and at the University of California in Santa Barbara, a group around Daisuke KITAZAWA at Toray has synthesized a new semiconductor polymer "PBDTTT-OFT" that is heat resistent and shows high energy conversion efficiency. PBDTTT - OFT has a skeleton similar to "PBDTTT - EFT (or PTB 7 - Th)" which has been widely used as a material for organic solar cells, but differs by a linear side chain and can form a film with high crystallinity. As a consequence,reduction in conductivity due to heating is smaller than that of conventional PBDTTT-EFT. In a sealed film structure (double sealing film) composed of two layers, a polymer excellent in liquid repellency and in gas barrier property with greatly improved atmospheric stability was realized. Further, when the change in energy conversion efficiency after 5 minutes of placing the polymer on a heated hot plate was measured, it had hardly changed even after heating at 100 ° C.
We thus in pasted the polymer on cloth by a hot melt method which is commonly used when making apparel. Polyester was used as the material of the fabric, and a polyurethane-made melt film was used. There was almost no change or deterioration in the characteristics of the solar cell before and after this hot-melt procedure, suggesting its use for long-term stable power supply applications on wearable devices and e-textiles.
Source: JST news release, April 17, 2018
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