Colloidal CdSe Nanocrystals Deposited into Thin Films and Infiltrated into Nanoporous Matrices for Nonlinear Optical Applications

Raktim Baruah^a^,^b, Munira Dilshad^a, Harshitha N. Gopalakrisha^c, Viacheslav Korolev^c, Lilit Ghazaryan^d^,^e, Siddhi Gojare^e, Adriana Szheghalmi^d^,^e^,^f, Daniil Kartashov^c^,^f, Maria Wächtler^a^,^b^,^f

^aLeibniz Institute of Photonic Technology, Jena, Germany

^bInstitute of Physical Chemistry, Friedrich Schiller University, Jena, Germany

^cInstitute of Optics and Quantum Electronics, Friedrich Schiller University, Jena, Germany

^dFraunhofer Institute for Applied Optics and precision Engineering IOF, Jena, Germany

^eInstitute of Applied Physics, Friedrich Schiller University, Jena, Germany

^fAbbe Center of Photonics, Jena, Germany

Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Spring Meeting 2022 (NSM22)

#ChemNano22. Chemistry of Nanomaterials

Online, Spain, 2022 March 7th - 11th

Organizers: Loredana Protesescu and Maksym Yarema

, Raktim Baruah, presentation 387
DOI: https://doi.org/10.29363/nanoge.nsm.2022.387
Publication date: 7th February 2022

Colloidal semiconductor nanocrystals like quantum dots (QD), nanorods, nanoplatelets etc. are of interest to a broad range of optical and electronic applications having electronic properties which are tunable by variations in size and shape, and showing discrete energy levels due to spatial quantization of electron and hole motion instead of a band structure as in the bulk. Fabrication of optoelectronic devices; photovoltaic cells, photodetectors, LEDs using colloidal nanocrystal has been addressed in the last few years. Further, these structures are of highest interest in non-linear optical (NLO) applications.

In this contribution we report on the preparation of materials based on colloidal CdSe QDs to explore the effect of high-order harmonic generation (HHG) in nanoscale solids. To enable the investigation of the impact of quantum confinement on the HHG process thin films are generated from colloidal QDs with various sizes entering different regimes from strong confinement (r < Bohr’s radius) to weak confinement (r > Bohr’s radius) and with tunable inter QD coupling via surface ligands with different lengths. First results suggest that HHG can be used as a sensitive probe detecting spatial confinement of a free electron wavepacket motion in nanoscale solids.

Further, nanoporous materials infiltrated with NLO materials like CdSe QDs is of high interest. For this purpose, strategies for incorporation of QDs in porous silica matrices produced by atomic layer deposition (ALD) are investigated. We report on infiltration of pre-synthesized colloidal CdSe QDs and in-situ growth approaches of CdSe QDs inside the pores of the matrix via Successive Ionic Layer Adsorption and Reaction (SILAR) method. This method allows to control the size of QDs gown directly in the matrix via the number of immersions of porous matrix in the precursor solutions. Growth of QDs is followed via absorption and PL spectroscopy, XRD, SEM and EDX.

Acknowledgements:

Acknowledgement: Financial support is acknowledged by the German Research Foundation (DFG, CRC1275 “NOA”, project number 398816777, TP-C4, TP-B3), State of Thuringia ProExcellence Initiative APC₂₀₂₀, and the Fonds der Chemischen Industrie (FCI).

nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.

MATSUS

Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.

International Conference on Hybrid and Organic Photovoltaics

International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.

Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics

The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics

The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.