Sequential Cation Exchange Generated Superlattice Nanowires Forming Multiple p鈥搉 Heterojunctions

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• 作者：Chih-Shan Tan ; Ching-Hung Hsiao ; Shau-Chieh Wang ; Pei-Hsuan Liu ; Ming-Yen Lu ; Michael H. Huang ; Hao Ouyang ; Lih-Juann Chen
• 刊名：ACS Nano
• 出版年：2014
• 出版时间：September 23, 2014
• 年：2014
• 卷：8
• 期：9
• 页码：9422-9426
• 全文大小：347K
• ISSN：1936-086X

文摘

Fabrication of superlattice nanowires (NWs) with precisely controlled segments normally requires sequential introduction of reagents to the growing wires at elevated temperatures and low pressure. Here we demonstrate the fabrication of superlattice NWs possessing multiple p鈥搉 heterojunctions by converting the initially formed CdS to Cu₂S NWs first and then to segmented Cu₂S鈥揂g₂S NWs through sequential cation exchange at low temperatures. In the formation of Cu₂S NWs, twin boundaries generated along the NWs act as the preferred sites to initiate the nucleation and growth of Ag₂S segments. Varying the immersion time of Cu₂S NWs in a AgNO₃ solution controls the Ag₂S segment length. Adjacent Cu₂S and Ag₂S segments in a NW were found to display the typical electrical behavior of a p鈥搉 junction.

Keywords:

superlattice; heterojunction; p鈭抧 diode; cation exchange