Devices, structures, materials and methods for vertical light emitting transistors and light emitting displays
摘要
說明書
Transparent conductive electrodes are characterized by benchmark values for transparency and conductivity. A good material for use in VPLET devices should have a high transparency and a low sheet resistance. Currently the state of the art in transparent conductive electrodes is ITO (Indium titanium oxide), which has an excellent combination of high transparency and low sheet resistance. However, ITO is made of low abundance elements, and thus increases device cost. There are many fast-emerging transparent conductive materials like TCO (Transparent conductive oxide), PEDOTs (poly(3,4-ethylenedioxythiophene)) and other highly doped conductive polymers, carbon nanotubes and graphene. (See, e.g., C. Keplinger, et al., Science, vol. 341, pp. 984-987, 2013, the disclosure of which is incorporated herein by reference.) As shown in Table 1, below, under the equivalent transmittance, the sheet resistances of most of these new materials are about 3 to 6 times higher than that of ITO.
