Amorphous silicon as electron transport layer for colloidal semiconductor nanocrystals light emitting diode

Tao Song; Fute Zhang; Xiaojuan Shen; Xiaohong Zhang; Xiulin Zhu; Baoquan Sun
December 2009
Applied Physics Letters;12/7/2009, Vol. 95 Issue 23, p233502
Academic Journal
We demonstrate the fabrication of light-emitting diodes (LEDs) made from all-inorganic colloidal semiconducting nanocrystals (NCs). The diode utilizes a sandwich structure formed by placing CdSe/CdS NCs between two layers of Si and AgxO, which act as electron- and hole-transporting materials, respectively. The photoluminescence properties of NCs are rendered less dependent upon surface chemistry and chemical environment by growing a thick CdS shell. It also enhances stability of the NCs during the process of magnetron sputtering for silicon deposition. The resulting LED device exhibits a low turn-on voltage of 2.5 V and the maximum external quantum efficiency of nearly 0.08%.


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