Transparent and flexible capacitors based on nanolaminate Al(2)O(3)/TiO(2)/Al(2)O(3)

Transparent and flexible capacitors based on nanolaminate Al(2)O(3)/TiO(2)/Al(2)O(3) dielectrics have been fabricated on indium tin oxide-coated polyethylene naphthalate substrates by atomic layer deposition. A capacitance density of 7.8 fF/μm(2) at 10 KHz was obtained, corresponding to a dielectric constant of 26.3. Moreover, a low leakage current density of 3.9 × 10(−8) A/cm(2) at 1 V has been realized. Bending test shows that the capacitors have better performances in concave conditions than in convex conditions. The capacitors exhibit an average optical transmittance of about 70% in visible range and thus open the door for applications in transparent and flexible integrated circuits.