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

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 4x10^6 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.

arXiv comment29 pages, 6 figures, supporting information, Adv. Funct. Mater. (2018)

References in corpus (13)

• Atomically thin MoS2: A new direct-gap semiconductor
• Black phosphorus field-effect transistors
• High Performance Single Layered WSe2 p-FETs with Chemically Doped Contacts
• Ultra-thin PbS sheets by two-dimensional oriented attachment
• Charge Transfer Induced Polarity Switching in Carbon Nanotube Transistors
• Field-effect transistors assembled from functionalized carbon nanotubes
• Field-effect transistors made of individual colloidal PbS nanosheets
• Tailoring the height of ultrathin PbS nanosheets and their application as field-effect transistors
• Size, Shape, and Phase Control in Ultrathin CdSe Nanosheets
• Towards colloidal spintronics through Rashba spin-orbit interaction in lead sulphide nanosheets
• Photovoltaic effect in individual asymmetrically contacted lead sulfide nanosheets
• From dots to stripes to sheets - Shape control of lead sulfide nanostructures
• New ways to synthesize lead sulfide nanosheets - substituted alkanes direct the growth of 2D nanostructures

Cited by in corpus (6)

• Anisotropic circular photogalvanic effect in colloidal tin sulfide nanosheets
• Colloidal two-dimensional metal chalcogenides: Realization and application of the structural anisotropy
• Photoexcitation of PbS Nanosheets Leads to Highly Mobile Charge Carriers and Stable Excitons
• Synthesis of single-crystalline lead sulfide nanoframes and nanorings
• Template Mediated Formation of Colloidal Two-Dimensional Tin Telluride Nanosheets and the Role of the Ligands
• Function follows form: From semiconducting to metallic towards superconducting PbS nanowires by faceting the crystal