Large scale fabrication of well-aligned CdS/p-Si shell/core nanowire arrays for photodetectors using solution methods†,10.1039/C5CP00679A

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Large scale fabrication of well-aligned CdS/p-Si shell/core nanowire arrays for photodetectors using solution methods†

Yurong Jiang,Chen Li,Weiwei Cao,Yanrong Jiang,Shuying Shang,Congxin Xia

Physical Chemistry Chemical Physics Pub Date : 06/10/2015 00:00:00 , DOI:10.1039/C5CP00679A

Abstract

We report a facile approach for the preparation of the vertically aligned, large scale CdS/p-Si shell/core nanowire heterojunction arrays based on successive ionic layer adsorption and reaction deposition. The results indicate that the rectifying characteristics of CdS/Si shell/core nanowire arrays can be tailored by changing the number of SILAR cycles, and the CdS/Si shell–core nanowire heterojunctions have good photo-sensitivity (the ratio of photocurrent to dark current could reach 14.96 at −1 V reverse bias) under AM 1.5 (1 Sun) illumination. Furthermore, the electron transport mechanism across the CdS/Si nano-heterojunctions is also discussed in detail. This reported CdS/p-Si shell/core nanowire structure offers a generic approach for the integration of new functional materials for photo-electronics applications.