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  1. Article ; Online: High-Resolution Spectroscopic Investigation of the CH

    Chahbazian, Rosemonde / Martin-Drumel, Marie-Aline / Pirali, Olivier

    The journal of physical chemistry. A

    2024  Volume 128, Issue 2, Page(s) 370–377

    Abstract: In this work, the pure rotational spectrum of the vinoxy radical ( ... ...

    Abstract In this work, the pure rotational spectrum of the vinoxy radical (CH
    Language English
    Publishing date 2024-01-05
    Publishing country United States
    Document type Journal Article
    ISSN 1520-5215
    ISSN (online) 1520-5215
    DOI 10.1021/acs.jpca.3c06326
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Local Energy Landscape Drives Long-Range Exciton Diffusion in Two-Dimensional Halide Perovskite Semiconductors.

    Baldwin, Alan / Delport, Géraud / Leng, Kai / Chahbazian, Rosemonde / Galkowski, Krzysztof / Loh, Kian Ping / Stranks, Samuel D

    The journal of physical chemistry letters

    2021  Volume 12, Issue 16, Page(s) 4003–4011

    Abstract: Halide perovskites are versatile semiconductors with applications including photovoltaics and light-emitting devices, having modular optoelectronic properties realizable through composition and dimensionality tuning. Layered Ruddlesden-Popper perovskites ...

    Abstract Halide perovskites are versatile semiconductors with applications including photovoltaics and light-emitting devices, having modular optoelectronic properties realizable through composition and dimensionality tuning. Layered Ruddlesden-Popper perovskites are particularly interesting due to their unique 2D character and charge carrier dynamics. However, long-range energy transport through exciton diffusion in these materials is not understood or realized. Here, local time-resolved luminescence mapping techniques are employed to visualize exciton transport in exfoliated flakes of the BA
    Language English
    Publishing date 2021-04-20
    Publishing country United States
    Document type Journal Article
    ISSN 1948-7185
    ISSN (online) 1948-7185
    DOI 10.1021/acs.jpclett.1c00823
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  3. Article: Visualizing Buried Local Carrier Diffusion in Halide Perovskite Crystals via Two-Photon Microscopy.

    Stavrakas, Camille / Delport, Géraud / Zhumekenov, Ayan A / Anaya, Miguel / Chahbazian, Rosemonde / Bakr, Osman M / Barnard, Edward S / Stranks, Samuel D

    ACS energy letters

    2019  Volume 5, Issue 1, Page(s) 117–123

    Abstract: Halide perovskites have shown great potential for light emission and photovoltaic applications due to their remarkable electronic properties. Although the device performances are promising, they are still limited by microscale heterogeneities in their ... ...

    Abstract Halide perovskites have shown great potential for light emission and photovoltaic applications due to their remarkable electronic properties. Although the device performances are promising, they are still limited by microscale heterogeneities in their photophysical properties. Here, we study the impact of these heterogeneities on the diffusion of charge carriers, which are processes crucial for efficient collection of charges in light-harvesting devices. A photoluminescence tomography technique is developed in a confocal microscope using one- and two-photon excitation to distinguish between local surface and bulk diffusion of charge carriers in methylammonium lead bromide single crystals. We observe a large dispersion of local diffusion coefficients with values between 0.3 and 2 cm
    Language English
    Publishing date 2019-11-27
    Publishing country United States
    Document type Journal Article
    ISSN 2380-8195
    ISSN 2380-8195
    DOI 10.1021/acsenergylett.9b02244
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Book ; Online: Local energy landscape drives long exciton diffusion in 2D halide perovskite semiconductors

    Baldwin, Alan / Delport, Géraud / Leng, Kai / Chahbazian, Rosemonde / Galkowski, Krzysztof / Loh, Kian Ping / Stranks, Samuel D.

    2020  

    Abstract: Halide perovskites have emerged as disruptive semiconductors for applications including photovoltaics and light emitting devices, with modular optoelectronic properties realisable through composition and dimensionality tuning. Layered Ruddlesden-Popper ... ...

    Abstract Halide perovskites have emerged as disruptive semiconductors for applications including photovoltaics and light emitting devices, with modular optoelectronic properties realisable through composition and dimensionality tuning. Layered Ruddlesden-Popper perovskites of the form BA2MAn-1PbnI3n+1, where n is the number of lead-halide and methylammonium (MA) sheets spaced by longer butylammonium (BA) cations, are particularly interesting due to their unique two-dimensional character and charge carrier dynamics dominated by strongly bound excitons. However, long-range energy transport through exciton diffusion in these materials is not understood or realised. Here, we employ local time-resolved luminescence mapping techniques to visualise exciton transport in high-quality exfoliated flakes of the BA2MAn-1PbnI3n+1 perovskite family. We uncover two distinct transport regimes, depending on the temperature range studied. At temperatures above 100 K, diffusion is mediated by thermally activated hopping processes between localised states. At lower temperatures, a non-uniform energetic landscape emerges in which exciton transport is dominated by energy funnelling processes to lower energy states, leading to long range transport over hundreds of nanometres even in the absence of exciton-phonon coupling and in the presence of local optoelectronic heterogeneity. Efficient, long-range and switchable excitonic funnelling offers exciting possibilities of controlled directional long-range transport in these 2D materials for new device applications.
    Keywords Physics - Applied Physics ; Condensed Matter - Materials Science
    Subject code 530
    Publishing date 2020-10-29
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  5. Book ; Online: Visualizing buried local carrier diffusion in halide perovskite crystals via two-photon microscopy

    Stavrakas, Camille / Delport, Géraud / Zhumekenov, Ayan A. / Anaya, Miguel / Chahbazian, Rosemonde / Bakr, Osman M. / Barnard, Edward S. / Stranks, Samuel D.

    2019  

    Abstract: Halide perovskites have shown great potential for light emission and photovoltaic applications due to their remarkable electronic properties and compatibility with cost-effective fabrication techniques. Although the device performances are promising, ... ...

    Abstract Halide perovskites have shown great potential for light emission and photovoltaic applications due to their remarkable electronic properties and compatibility with cost-effective fabrication techniques. Although the device performances are promising, they are still limited by microscale heterogeneities in their photophysical properties. In particular, the relation between local heterogeneities and the diffusion of charge carriers at the surface and in the bulk, crucial for efficient collection of charges in a light harvesting device, is not well understood. Here, a photoluminescence tomography technique is developed in a confocal microscope using one- and two-photon excitation to distinguish between local surface and bulk diffusion of charge carriers in methylammonium lead bromide single crystals. The local temporal diffusion is probed at various excitation depths to build statistics of local electronic diffusion coefficients. The measured values range between 0.3 to 2 $cm^2.s^{-1}$ depending on the local trap density and the morphological environment - a distribution that would be missed from analogous macroscopic or surface-measurements. Tomographic images of carrier diffusion were reconstructed to reveal buried crystal defects that act as barriers to carrier transport. This work reveals a new framework to understand and homogenise diffusion pathways, which are extremely sensitive to local properties and buried defects.

    Comment: C.S. and G.D. contributed equally to this work * corresponding author sds65@cam.ac.uk
    Keywords Condensed Matter - Materials Science ; Physics - Optics
    Subject code 535
    Publishing date 2019-09-28
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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