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Solution-processed semiconductor nanostructures for thin-film optoelectronics

Data: Venerdì 28 novembre 2022, 12:00

Titolo: Solution-processed semiconductor nanostructures for thin-film optoelectronics

Relatore: Enrico Della Gaspera School of Science, RMIT University, Melbourne, VIC 3000, Australia

Abstract: Solution processing is an accessible and versatile approach for synthesizing structurally and chemically controlled nanomaterials. The ability to control the purity, surface chemistry, and microstructure of solution-processed nanomaterials using tailored reaction chemistry and processing conditions will enable to move away from vacuum-based processes. This will reduce the cost and improve the scalability of nanomaterials and related devices, therefore meeting the increasing demand for cheaper consumer electronics. In this talk, I will present an overview of solution-based approaches my group has developed over the past few years to synthesize semiconducting nanostructures for applications in optoelectronics.
First, I will focus on colloidal syntheses for semiconducting nanocrystals, using plasmonic (doped) ZnO as a case study to elucidate various synthesis approaches, doping strategies, scalability, and the fabrication of nanocrystal-based thin films. The distinctive optical and electrical properties of these doped colloids will be harnessed through the fabrication of infrared absorbers, transparent electrodes and plasmonic gas sensors.
Then I will present the synthesis of nanostructured thin films via decomposition of suitable precursors directly on the desired substrate. I will discuss the advantages of chemical bath deposition in the fabrication of high-quality inorganic coatings at low temperatures (<80 °C) with excellent control on their optoelectronic properties, enabling applications within solar cells and light emitting devices. Next, I will discuss the versatility of ultrasonic spray pyrolysis, presenting a comprehensive overview of SnO2-based films as a model system, and then focussing on novel coatings such as CuCrO2, demonstrating the synthesis of transparent conductors able to compete with commercially available products. Finally, I will present some recent results on the synthesis of nanostructured BiVO4 coatings via SILAR (successive ionic layer absorption and reaction) for application in photoelectrochemical water splitting, and of bismuth chalcohalide (BiOI, BiSI) thin films for high performance photodetectors.

Host: Arrigo Calzolari (CNR-NANO) arrigo.calzolari@nano.cnr.it

[Ultimo aggiornamento: 08/11/2022 10:31:59]