ReOx charge injection/blocking layers in organic electronic devices

The charge transport of rhenium oxide (ReOx) in organic electronic devices was investigated. The hole injection/transport was blocked and the electron injection/transport was enhanced with doping of ReOx in organic electronic devices. Thus the charge balance and efficiency of organic light-emitting diodes were improved; current efficiency of 2.7 cd A(-1) at 20 mA cm(-2) for the device with ReOx was higher than 1.5 cd A(-1) for the device without it. In the case of organic photovoltaic cells, the open-circuit voltage (V-oc), 0.58 V, was higher compared with the device without ReOx (0.44 V) due to the improvement of interface properties. The power conversion efficiency was increased to 2.27% by the combination of ReOx (increases V-oc) with poly(3,4-ethylenedioxythiophene) : poly(styrene-sulfonate) (improves hole transport to increase J(sc)) on the modification of the anode, higher than 1.85% for the device without ReOx.