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Austin, Jonathan (2024) Inkjet printing heterostructures for optoelectronic device applications. PhD thesis, University of Nottingham.

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Abstract

Devices that combine the tuneable optical properties of 0-dimensional (0D) materials, such as perovskite nanocrystals (NCs), with the unique electrical properties of 2-dimensional (2D) layers, such as graphene, are promising candidates for the next generation of optoelectronics. However, these high-performance devices typically require bespoke fabrication techniques and are yet to reach commercial viability. Inkjet printing can offer a promising route for scalable manufacturing of devices on various substrates from Si/SiO2 to flexible polymers. However, many functional nanomaterials have not yet been formulated or optimised for deposition via inkjet printing and the fully printed heterostructures needed for many optoelectronic devices have proven challenging to fabricate.

This work reports on the formulation of inks for inkjet deposition of all-inorganic CsPbX3 (X = Br or Br/I) perovskite NCs, graphene quantum dots (GQD), poly-TPD and TPBI, thereby increasing the availability of optically active and charge transport materials for additive manufacturing technologies. Using these inks, heterostructures were printed and their interfaces investigated to optimise printing strategies so as to improve uniformity and reduce intermixing between printed layers.

With this knowledge, a variety of optoelectronic devices were printed. The perovskite and GQD inks were printed onto pristine graphene devices, which achieved photodetection in the ultraviolet to visible (UV-Vis) range with photoresponsivity up to R ~ 106 A/W. Fully printed photodetectors were also fabricated for applications on flexible substrates, by decorating inkjet printed graphene with perovskite NCs, which achieved photoresponsivity of R > 10 A/W. A fully printed perovskite light emitting diode (LED) was also fabricated, with six different materials, including the charge injection layers poly-TPD and TPBI, and while no emission was recorded, promising results were measured, indicating the viability of the fabrication method. This work expands the library of functional material inks and demonstrates the great potential of inkjet printing for the manufacturing of optoelectronic devices.

Item Type:	Thesis (University of Nottingham only) (PhD)
Supervisors:	Turyanska, Lyudmila Makarovsky, Oleg Hague, Richard Tuck, Christopher
Keywords:	Inkjet Printing, Heterostructures, Optoelectronics, Electronics, Low-Dimensional Materials, Graphene, Perovskite, LED, Photodetector
Subjects:	T Technology > TS Manufactures
Faculties/Schools:	UK Campuses > Faculty of Engineering > Department of Mechanical, Materials and Manufacturing Engineering
Item ID:	76970
Depositing User:	Austin, Jonathan
Date Deposited:	18 Jul 2024 04:40
Last Modified:	18 Jul 2024 04:40
URI:	https://eprints.nottingham.ac.uk/id/eprint/76970

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