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  1. Article ; Online: Can ferroelectric polarization explain the high performance of hybrid halide perovskite solar cells?

    Sherkar, Tejas S / Koster, L Jan Anton

    Physical chemistry chemical physics : PCCP

    2016  Volume 18, Issue 1, Page(s) 331–338

    Abstract: The power conversion efficiency of photovoltaic cells based on the use of hybrid halide perovskites, CH3NH3PbX3 (X = Cl, Br, I), now exceeds 20%. Recently, it was suggested that this high performance originates from the presence of ferroelectricity in ... ...

    Abstract The power conversion efficiency of photovoltaic cells based on the use of hybrid halide perovskites, CH3NH3PbX3 (X = Cl, Br, I), now exceeds 20%. Recently, it was suggested that this high performance originates from the presence of ferroelectricity in the perovskite, which is hypothesized to lower charge recombination in the device. Here, we investigate and quantify the influence of mesoscale ferroelectric polarization on the device performance of perovskite solar cells. We implement a 3D drift diffusion model to describe the solar cell operation. To account for the mesoscale ferroelectricity, we incorporate domains defined by polarization strength, P, in 3D space, forming different polarization landscapes or microstructures. Study of microstructures with highly-ordered polarized domains shows that charge transport and recombination in the solar cell depends significantly on the polarization landscape viz. the orientation of domain boundaries and the size of domains. In the case of the microstructure with random correlated polarization, a realistic scenario, we find indication of the existence of channels for efficient charge transport in the device which leads to lowering of charge recombination, as evidenced by the high fill factor (FF). However, the high open-circuit voltage (VOC), which is typical of high performance perovskite solar cells, is unlikely to be explained by the presence of ferroelectric polarization in the perovskite.
    Language English
    Publishing date 2016-01-07
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1476244-4
    ISSN 1463-9084 ; 1463-9076
    ISSN (online) 1463-9084
    ISSN 1463-9076
    DOI 10.1039/c5cp07117h
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Dielectric Effects at Organic/Inorganic Interfaces in Nanostructured Devices.

    Sherkar, Tejas S / Koster, L Jan Anton

    ACS applied materials & interfaces

    2015  Volume 7, Issue 22, Page(s) 11881–11889

    Abstract: Dielectric interfaces are important in organic electronic devices, as they dominate charge generation and recombination dynamics and set the tone for efficiency of the device. In a charge separation scenario across the interface, we calculate the binding ...

    Abstract Dielectric interfaces are important in organic electronic devices, as they dominate charge generation and recombination dynamics and set the tone for efficiency of the device. In a charge separation scenario across the interface, we calculate the binding energy of a charge carrier for variations in dielectric mismatch (i.e., the ratio of the dielectric constant of materials forming the interface), interface shape and size, and dielectric anisotropy. We find that dielectric mismatch results in binding of the charge carrier to the interface with energies on the order of several kT. For the variation in interface shape and size, epitomized by the device morphology, we show that the assumption of a planar interface overestimates the attractive potential. The change in the interface curvature affects the binding energy of the charge carrier by order of kT. Anisotropy is shown to affect critically the electric field along the principal axis, while the binding energy of the charge is altered by more than 5 kT. We are able to give an upper limit on the change in the binding energy for the variations in the above interfacial factors. These limits can serve as guidelines for optimization, interface engineering, and design of high efficiency organic electronic devices.
    Language English
    Publishing date 2015-06-10
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.5b01606
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Dielectric Effects at Organic/Inorganic Interfaces in Nanostructured Devices

    Sherkar, Tejas S / Koster L. Jan Anton

    ACS Applied Materials & Interfaces. 2015 June 10, v. 7, no. 22

    2015  

    Abstract: Dielectric interfaces are important in organic electronic devices, as they dominate charge generation and recombination dynamics and set the tone for efficiency of the device. In a charge separation scenario across the interface, we calculate the binding ...

    Abstract Dielectric interfaces are important in organic electronic devices, as they dominate charge generation and recombination dynamics and set the tone for efficiency of the device. In a charge separation scenario across the interface, we calculate the binding energy of a charge carrier for variations in dielectric mismatch (i.e., the ratio of the dielectric constant of materials forming the interface), interface shape and size, and dielectric anisotropy. We find that dielectric mismatch results in binding of the charge carrier to the interface with energies on the order of several kT. For the variation in interface shape and size, epitomized by the device morphology, we show that the assumption of a planar interface overestimates the attractive potential. The change in the interface curvature affects the binding energy of the charge carrier by order of kT. Anisotropy is shown to affect critically the electric field along the principal axis, while the binding energy of the charge is altered by more than 5 kT. We are able to give an upper limit on the change in the binding energy for the variations in the above interfacial factors. These limits can serve as guidelines for optimization, interface engineering, and design of high efficiency organic electronic devices.
    Keywords electric field ; electronic equipment ; energy ; guidelines
    Language English
    Dates of publication 2015-0610
    Size p. 11881-11889.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1944-8252
    DOI 10.1021%2Facsami.5b01606
    Database NAL-Catalogue (AGRICOLA)

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    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

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  4. Article: Recombination in Perovskite Solar Cells: Significance of Grain Boundaries, Interface Traps, and Defect Ions.

    Sherkar, Tejas S / Momblona, Cristina / Gil-Escrig, Lidón / Ávila, Jorge / Sessolo, Michele / Bolink, Henk J / Koster, L Jan Anton

    ACS energy letters

    2017  Volume 2, Issue 5, Page(s) 1214–1222

    Abstract: Trap-assisted recombination, despite being lower as compared with traditional inorganic solar cells, is still the dominant recombination mechanism in perovskite solar cells (PSCs) and limits their efficiency. We investigate the attributes of the primary ... ...

    Abstract Trap-assisted recombination, despite being lower as compared with traditional inorganic solar cells, is still the dominant recombination mechanism in perovskite solar cells (PSCs) and limits their efficiency. We investigate the attributes of the primary trap-assisted recombination channels (grain boundaries and interfaces) and their correlation to defect ions in PSCs. We achieve this by using a validated device model to fit the simulations to the experimental data of efficient vacuum-deposited p-i-n and n-i-p CH
    Language English
    Publishing date 2017-05-02
    Publishing country United States
    Document type Journal Article
    ISSN 2380-8195
    ISSN 2380-8195
    DOI 10.1021/acsenergylett.7b00236
    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.

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