| 초록 |
Recently, printed electronics based on solution process are paid attentions because of great potentials which can be simply processed, realized low cost process and applied to roll-to-roll system. Indium-tin-oxide (ITO) is most widely used materials for transparent conductive electrode (TCE) in opto-electronic devices. However ITO films are made by vacuum process such as sputter, furthermore the brittleness of ITO films is a bottleneck for flexible electronics. Poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS), reduced graphene oxide and silver nanowires (AgNWs) are strong candidates for substitution of vacuum deposited TCEs. The limited sheet resistance, however, gives high electrical losses of cells and leads to decrease efficiency. To solve these problems, we have developed a hybrid structure of soluble TCEs which consist of very narrow printed Ag grids for assisted electrodes which were embedded in flexible substrate. After then we have prepared the bottom electrodes such as AgNWs, Graphene, ITO, and others on the top of Ag grids. Organic devices such as OLEDs and OPVs were prepared using these metal embedded flexible TCEs substrate. These OLEDs and OPVs showed very higher flexibility which could withstand after almost folding, 1 mm of bending radius and show similar efficiencies compared with that of ITO. |
