Publication date: 15th December 2025
Chalcogenide nanocrystals (NCs) are promising materials for low-cost and energy-efficient optoelectronic technologies, including solar cells, light-emitting diodes etc. For their successful integration into such devices, a detailed understanding of electronic band structure, charge injection and charge transport processes in NC-based thin films is essential. Charge injection efficiency is governed by the shape, electronic band structure as well as by their surface chemistry, which together determine the transport dynamics/kinetics of charge carriers and the location of charge injection in the band structure. Electrochemistry combined with spectroscopy i.e. Spectro-electrochemistry (SEC) is a powerful tool for studies of the electronic band structure and transport dynamics/kinetics of charge carriers. In my presentation I will summarize the results of our spectro-electrochemical investigation of the charge transport in nanocrystalline thin films composed of CdSe NCs with different shapes; spherical quantum dots (QDs) and, anisotropic nanorods (NRs). The CdSe NRs used in the study have diameters comparable to those of the QDs, while their aspect ratios range from ~2.0 to ~6.5. By systematically varying CdSe NC shape, size, and molecular linkers used in the film preparation, we elucidate the key parameters governing charge transport efficiency and dynamics in the films. Our results show that, under comparable fabrication conditions, the electrochemical charge injection is more efficient and charge transport more dynamic compared to quantum dot films. This difference is attributed to the intrinsic structural anisotropy of the NRs, which promotes formation of more continuous transport pathways for the charge balancing counterions within the film, thereby facilitating an efficient charge transport through the linked NCs. Furthermore, within nanorod assemblies, charge transport becomes progressively more efficient with increasing rod thickness and aspect ratio. These findings provide important insights into morphology-driven charge transport in nanocrystal solids and offer clear design guidelines for optimizing nanocrystal-based optoelectronic devices.
This work was supported by the EU NextGenerationEU through the Recovery and Resilience Plan for Slovakia under the project No. (i) 09I03-03-V04-00069 and (ii) 09I01-03-V04-00017 and also by the Slovak Research and Development Agency under grant agreement no. APVV-23-0300 and Slovak Ministry of Education under grant agreement No. 1/0832/25.
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