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Interfacial Effects of UV-Ozone Treated Sol-Gel Processable ZnO for Hybrid Photodetectors and Thin Film Transistors

Published online by Cambridge University Press:  03 July 2019

Alec Pickett ,
Aiswarya A. Mohapatra ,
Suman Ray ,
Christopher Robledo ,
Kartik Ghosh ,
Satish Patil  and
Suchismita Guha
Alec Pickett*
Affiliation:
Department of Physics and Astronomy, University of Missouri, Columbia, MO65211, USA
Aiswarya A. Mohapatra
Affiliation:
Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore560012, India
Suman Ray
Affiliation:
Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore560012, India
Christopher Robledo
Affiliation:
Department of Physics, Astronomy, and Materials Science, Missouri State University, Springfield, MO65897, USA
Kartik Ghosh
Affiliation:
Department of Physics, Astronomy, and Materials Science, Missouri State University, Springfield, MO65897, USA
Satish Patil
Affiliation:
Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore560012, India
Suchismita Guha
Affiliation:
Department of Physics and Astronomy, University of Missouri, Columbia, MO65211, USA
*
*(Email: ampx23@mail.missouri.edu)
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Abstract

Hybrid organic-inorganic semiconducting interfaces have attracted attention in photodiodes and field-effect transistors (FETs) due to the realization of intrinsic p-n junctions and their mechanical flexibility. With the difficulty of developing high-mobility n-type organic semiconductors due to the necessity of low LUMO levels and ambient environment stability, solution processable inorganic materials are an excellent alternative. ZnO is an intrinsic n-type semiconductor which is non-toxic and sol-gel processable, creating avenues for film patterning and fully solution processed devices. We report the improvement of electron mobilities in ZnO FETs through simple UV-Ozone processing which reduces lattice defects within the film and at the SiO2/ZnO interface. Treated ZnO films yield electron mobilities close to 10-2 cm2/Vs and on/off current ratios of 104 while non-treated films have mobilities on the order of 10-5 cm2/Vs and an order of magnitude lower on/off current ratios. Treated films also yield improved photoresponsivity and detectivity in hybrid ZnO-organic photodetectors.

Keywords

organicII-VIinterfacedevicessol-gel
Type
Articles
Information
MRS Advances , Volume 4 , Issue 31-32: Electronics and Photonics , 2019 , pp. 1793 - 1800
Copyright
Copyright © Materials Research Society 2019 

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References

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