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

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6 Author(s)
Song, Tao ; Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Functional Nano and Soft Materials Laboratory (FUNSOM), Soochow University, 199 Ren’ai Road, Suzhou 215123, People’s Republic of China ; Zhang, Fute ; Shen, Xiaojuan ; Zhang, Xiaohong
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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%.

Published in:

Applied Physics Letters  (Volume:95 ,  Issue: 23 )

Date of Publication:

Dec 2009

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