Effects of electron injection efficiency on performances of Si nanocrystal light-emitting diodes

We have investigated the effects of electron injection efficiency on the electrical and optical performances of the nc‐Si LEDs. The current‐voltage curves of nc‐Si LED with 6‐periods of SiCN/SiC multiple electron injection layers was better than that of nc‐Si LED with single SiC electron injection layer. This can be attributed to the increase in an electron density of the 6‐periods of SiCN/SiC multiple electron layers compared to that of the single SiC electron injection layer because the electron density of SiCN layer is higher than SiC layer. Light output power of the LED with 6‐periods of SiCN/SiC multiple electron injection layers was improved by 50% compared to that of LED with single SiC electron injection layer. We show here that the use of the multiple electron injection structure could be used to realize a highly efficient nc‐Si LED.