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High‐Performance n‐ and p‐Type Field‐Effect Transistors Based on Hybridly Surface‐Passivated Colloidal PbS Nanosheets

Mohammad Mehdi Ramin Moayed, Thomas Bielewicz, Heshmat Noei, Andreas Stierle, Christian Klinke Orcid Logo

Advanced Functional Materials, Volume: 28, Issue: 19, Start page: 1706815

Swansea University Author: Christian Klinke Orcid Logo

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DOI (Published version): 10.1002/adfm.201706815

Abstract

Colloidally synthesized nanomaterials are among the promising candidates for future electronic devices due to their simplicity and the inexpensiveness of their production. Specifically, colloidal nanosheets are of great interest since they are conveniently producible through the colloidal approach w...

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Published in: Advanced Functional Materials
ISSN: 1616-301X 1616-3028
Published: Wiley 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa39354
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Abstract: Colloidally synthesized nanomaterials are among the promising candidates for future electronic devices due to their simplicity and the inexpensiveness of their production. Specifically, colloidal nanosheets are of great interest since they are conveniently producible through the colloidal approach while having the advantages of two-dimensionality. In order to employ these materials, according transistor behavior should be adjustable and of high performance. We show that the transistor performance of colloidal lead sulfide nanosheets is tunable by altering the surface passivation, the contact metal, or by exposing them to air. We found that adding halide ions to the synthesis leads to an improvement of the conductivity, the field-effect mobility, and the on/off ratio of these transistors by passivating their surface defects. Superior n-type behavior with a field-effect mobility of 248 cm^2V^-1s^-1 and an on/off ratio of 4×10^6 is achieved. The conductivity of these stripes can be changed from n-type to p-type by altering the contact metal and by adding oxygen to the working environment. As a possible solution for the post-Moore era, realizing new high quality semiconductors such as colloidal materials is crucial. In this respect, our results can provide new insights which helps to accelerate their optimization for potential applications.
Keywords: lead sulfide, colloidal nanocrystals, two-dimensional materials, electrical transport, doping, field-effect transistor
College: College of Science
Issue: 19
Start Page: 1706815