Toray develops wearable power supply which can be directly pasted on clothes by hot melt method

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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