Uncovering the density of nanowire surface trap states hidden in the transient photoconductance. Issue 35 (29th July 2016)

• Record Type: Journal Article
• Authors: Xu, Qiang; Dan, Yaping
• Is Part Of: Nanoscale. Volume 8:Issue 35(2016)
• Page Start: 15934
• Page End: 15938
• Publication Date: 2016-07-29
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c6nr05014j
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Density of surface trap states can be retrieved from the transient photocurrent. Abstract : The gain of nanoscale photoconductors is closely correlated with surface trap states. Mapping out the density of surface trap states in the semiconductor bandgap is crucial for engineering the performance of nanoscale photoconductors. Traditional capacitive techniques for the measurement of surface trap states are not readily applicable to nanoscale devices. Here, we demonstrate a simple technique to extract the information on the density of surface trap states hidden in the transient photoconductance that is widely observed. With this method, we found that the density of surface trap states of a single silicon nanowire is ∼10 12 cm −2 eV −1 around the middle of the upper half bandgap.