Charge storage characteristics of metal-induced nanocrystalline in erbium-doped amorphous silicon films Thin Solid Films Volume 516, Issue 21, 1 September 2008, Pages 7657-7660
Authors:Zhigang Li, Weihua Guan, Ming Liu, , , Shibing Long, Rui Jia, Jin Lv, Yi Shi,Xinwei Zhao
Abstract:
Amorphous silicon film (α-Si) doped with uniform erbium (Er) impurities is deposited by laser ablation technology. High density silicon nanocrystals (nc-Si) can be formed after the rapid thermal annealing (RTA) process. The crystalline process can be explained as the “metal-induced nanocrystalline mechanism”, i.e., doped erbium atoms introduce additional strain in the amorphous silicon matrix and behave as nucleation centers during the thermal annealing process. Through this method, Si nanocrystals with high density and self-limited size distribution can be obtained. The experimental results demonstrate that the Er-induced nanocrystalline silicon film has good charge storage characteristics. It is shown that the optimal condition for the Er-induced nanocrystalline layer in α-Si is with 1 wt.% Er concentration and 1100 °C RTA process for 30 s.
|