Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.659
Publication date: 16th December 2024
The interest in CuInS2 (CIS) quantum dots (QDs) has increased significantly in the past few years. CIS QDs have been studied for many applications like photodynamic therapy or solar cells[1]. They show exciting optoelectronic properties, such as broad photoluminescence (PL) with a large Stokes shift and long charge carrier lifetimes. Several mechanisms for the radiative recombination in CIS QDs have been proposed.
The most popular explanation is that radiative recombination results from an electron in the conduction band and a hole in a so-called confined hole state (CHS) related to Cu [2-3]. The range of such possible states would explain the broad PL and large Stokes shift. In addition, different synthetic characteristics, such as Cu:In stoichiometry, Zn doping or the passivation of the QDs can greatly affect the photophysical properties including the formation process of the CHS [4], as well as the structure.
X-ray techniques can be very useful tools to explore these kinds of systems from a new angle. X-ray absorption and emission spectroscopies provide information with element and oxidation state specificity, which can be useful to observe processes such as charge localization and transfer. These can be complemented with X-ray diffraction to have a more general view of the structure.
With the development of X-ray free electron lasers (XFELs), these techniques have become available in the ultrafast time-domain, allowing us to incorporate them in the study of the photophysics in many systems.
We will review our recent results obtained through a combination of laser, synchrotron and XFEL techniques. We focused on following the oxidation state of Cu through time-resolved Cu K-edge XANES and comparing the structure of the different samples through steady-state XANES and EXAFS at the Cu, Zn and S K-edges. This allowed us to gain insights into the structure, the surface passivation and the Zn incorporation through different synthetic routes. This was then complemented by optical studies [5].
AB is grateful to the Spanish “Ministerio de Universidades” and the “Plan de Recuperación, Transformación y Resiliencia”, as well as the UAM, for his “Margarita Salas” grant (ref. CA1/RSUE/2021-00809). In addition, he receives funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie agreement No. 101034431 and from the “Severo Ochoa” Programme for Centres of Excellence in R&D (CEX2020-001039S / AEI / 10.13039/501100011033. WG acknowledges funding from Spanish Ministry of Universities through “Ayudas Beatriz Galindo” (BEAGAL18/00092), Regional Government of Madrid and Universidad Autónoma de Madrid through “Proyectos de I+D para Investigadores del Programa Beatriz Galindo” grant (Ref. SI2/PBG/2020-00003) and from Spanish Ministry of Science, Innovation and Universities through “Proyectos de I+D+i 2019” grant (Ref. PID2019-108678GB-I00) and “Proyectos de I+D+i 2022” grant (Ref. PID2022-140257NB-I00).
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