Design and Implementation of Colloidal Quantum Dot Field-Effect Transistors

Abstract:

With the breakthrough of mobility in quantum dot electric field transistors (Q-EFTs), the potential application in these functional devices has revealed and been paid more attentions, due to flexibility in design, low cost, facility for processing and large area. One of the most important applications of FETs is the photoconductive detector. However, these functional FETs have less been reported. In this work, colloidal PbS Q-FETs were successfully fabricated by reasonable structure design and layer-by-layer depositon technique PbS quantum-dots. The bipolar property was demonstrated by the output and transfer characteristics, as devices work in I and III quadrants simultaneously. The mobilities of electron and hole are 0.16 cm²/(V⋅s) and 0.28 cm²/(V⋅s), respectively. Q-FETs work as photoconductive detectors at both positive and negative gate bias voltages. Under constant gate bias, photocurrent increase exponentially with the intensity of light. The responding region consisted with the absorption range of PbS quantum dots. A linearity was found in drain voltage and incidence of laser power, the ratio was attributing to 0.0019 (μW⋅V)^-1.

• Periodical: Applied Mechanics and Materials (Volumes 668-669)
• Pages: 818-821
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.668-669.818
• Online since: October 2014
• Authors: Hai Yan Wang, Ya Ting Zhang*, Xiao Xian Song, Lu Fan Jin, Hai Tao Dai, Sen Wu, Jian Quan Yao
• Keywords: Carrier Mobility, Field-Effect-Transistor, PbS Quantum-Dot, Respond to Light

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