Silicon solar cells incorporating double-sided pyramidal texture are capable of superior light trapping over cells with front-side only texture. However, increased surface area, roughness and exposed <111> crystal planes of textured surfaces not only causes increased recombination, but also makes cells susceptible to shunting through pinholes in the dielectric at the sharp peaks and valleys of ...

Optimizing the high-temperature energy storage characteristics of dielectrics is great significance for development pulsed power devices and control systems. Selecting a polymer with higher glass transition temperature (Tg) as matrix one effective ways to increase upper limit operating temperature. However, current high-Tg polymers have limitations, it difficult meet demand only polymer. For ex...

We present the development of a polyimide-based two-dimensional tactile sensing array realized using a novel inverted fabrication technique. Thermal silicon oxide or Pyrex R © substrates are treated such that their surfaces are OH group terminated, allowing good adhesion between such substrates and a spun-on polyimide film during processing through what are suspected to be hydrogen bonds that c...

Low color, flexible, space durable polyimide films with inherent, robust electrical conductivity have been under investigation as part of a continuing materials development activity for future NASA space missions involving Gossamer structures. Electrical conductivity is needed in these films to dissipate electrostatic charge build-up that occurs due to the orbital environment. One method of imp...

Ultraviolet light induced changes in polyimide liquid-crystal alignment films were investigated. Infrared, UV-visible, x-ray photoelectron spectroscopy, and electron-spin-resonance measurements indicated that bond breaking and subsequent oxidation reactions occur in polyimide films ~SE7210, OCG284, DuPont 2555 and 2540! during the broadband UV illumination in air. Mechanical rubbing has no effe...

The synthesis of high performance polyimide foams by the solid-state powder foaming of poly(amic acid) powders, containing hydrogen bonded blowing agent (THF), is described. During the thermal inflation of poly(amic acid) particles into polyimide microspheres, their fusion has been shown to produce the desired cellular architecture. In the present work, the solid state powder foaming process is...

Carbon-based polymer can catch fire when used as cathode material in batteries and supercapacitors, due to short circuiting. Polyimide is known exhibit flame retardancy by forming char layer condensed phase. The high yield of polyimide attributed its aromatic nature the existence a donor–acceptor complex backbone. Fabrication hybrid provide better protection against based on multiple fire-retar...