Cadmium Sulfide Nanocrystal Sensitized Vertically Aligned Titanium Dioxide Rods for Large Area Image Sensors on 3-D Substrates. (1st January 2015)

• Record Type: Journal Article
• Authors: Mazumdar, Sayantan; Nyaypati, Mahidhar; Sambandan, Sanjiv; Bhattacharyya, Aninda J.
• Is Part Of: ECS journal of solid state science and technology. Volume 4:Number 12(2015)
• Page Start: Q119
• Page End: Q123
• Publication Date: 2015-01-01
• Subjects: assembly -- cadmium sulfide nanocrystal -- high speed -- hole -- large area electronics -- semiconductors -- space charge limited photo-current -- three dimensional substra -- titanium dioxide rods; Solid state chemistry -- Periodicals; Electronics -- Materials -- Periodicals; Electrochemistry -- Periodicals; 541.0421
• DOI: 10.1149/2.0081512jss
• Languages: English
• ISSNs: 2162-8777

Abstract

Abstract : We discuss here a semiconductors assembly comprising of titanium dioxide (TiO2 ) rods sensitized by cadmium sulfide (CdS) nanocrystals for potential applications in large area electronics on three dimensional (3-D) substrates. Vertically aligned TiO2 rods are grown on a substrate using a 150° C process flow and then sensitized with CdS by SILAR method at room temperature. This structure forms an effective photoconductor as the photo-generated electrons are rapidly removed from the CdS via the TiO2 thereby permitting a hole rich CdS. Current-voltage characteristics are measured and models illustrate space charge limited photo-current as the mechanism of charge transport at moderate voltage bias. The stable assembly and high speed are achieved. The frequency response with a loading of 10 pF and 9 MΩ shows a half power frequency of 100 Hz.