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  1. Article ; Online: Origin of Contrasting Emission Spectrum of Bromide versus Iodide Layered Perovskite Semiconductors.

    Laxmi / Kabra, Dinesh

    The journal of physical chemistry letters

    2022  Volume 13, Issue 12, Page(s) 2737–2743

    Abstract: The origin of broadband emission is studied using temperature-dependent time-resolved photoluminescence (PL) spectra for two-dimensional (2D) layered halide perovskites (i.e., (PEA) ...

    Abstract The origin of broadband emission is studied using temperature-dependent time-resolved photoluminescence (PL) spectra for two-dimensional (2D) layered halide perovskites (i.e., (PEA)
    Language English
    Publishing date 2022-03-21
    Publishing country United States
    Document type Journal Article
    ISSN 1948-7185
    ISSN (online) 1948-7185
    DOI 10.1021/acs.jpclett.2c00362
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Study of Intrachain Charge Transfer in a Blue Emissive Polyfluorene Random Copolymer.

    Sardar, Gopa / Biswas, Abhinav / Singh, Shivam / Kabra, Dinesh

    The journal of physical chemistry. B

    2024  Volume 128, Issue 14, Page(s) 3521–3526

    Abstract: Photophysics of a blue light-emitting fluorescent random copolymer, consisting of arylated polydioctylfluorene (aryl-F8), polydioctylfluorene (F8), and amine comonomers in a ratio of 80:15:5 is reported. In a solution of ... ...

    Abstract Photophysics of a blue light-emitting fluorescent random copolymer, consisting of arylated polydioctylfluorene (aryl-F8), polydioctylfluorene (F8), and amine comonomers in a ratio of 80:15:5 is reported. In a solution of 10
    Language English
    Publishing date 2024-03-28
    Publishing country United States
    Document type Journal Article
    ISSN 1520-5207
    ISSN (online) 1520-5207
    DOI 10.1021/acs.jpcb.4c00767
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Impact of Photoluminescence Imaging Methodology on Transport Parameters in Semiconductors.

    Banappanavar, Gangadhar / Saxena, Rishabh / Bässler, Heinz / Köhler, Anna / Kabra, Dinesh

    The journal of physical chemistry letters

    2024  Volume 15, Issue 11, Page(s) 3109–3117

    Abstract: Triplet-triplet annihilation-induced delayed emission provides a pathway for investigating triplets via emission spectroscopy. This bimolecular annihilation depends directly on the transport properties of triplet excitons in disordered organic ... ...

    Abstract Triplet-triplet annihilation-induced delayed emission provides a pathway for investigating triplets via emission spectroscopy. This bimolecular annihilation depends directly on the transport properties of triplet excitons in disordered organic semiconductors. Photoluminescence (PL) imaging is a direct method for studying exciton and charge-carrier diffusivity. However, most of these studies neglect dispersive transport. Early time scale measurements using this technique can lead to an overestimation of the diffusion coefficient (
    Language English
    Publishing date 2024-03-12
    Publishing country United States
    Document type Journal Article
    ISSN 1948-7185
    ISSN (online) 1948-7185
    DOI 10.1021/acs.jpclett.4c00169
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Spinal Cord Infarction Thrombolysed at Seven Hours: A Case Report and Review of Literature.

    Chandak, Saket N / Chandak, Nitin / Kabra, Dinesh / Baheti, Neeraj

    Cureus

    2024  Volume 16, Issue 3, Page(s) e55983

    Abstract: We report a case of acute spinal cord infarction treated with intravenous (IV) thrombolysis at seven hours from symptom onset. Nineteen previously thrombolysed cases are reviewed. The patient underwent a clinical assessment, followed by an MRI of the ... ...

    Abstract We report a case of acute spinal cord infarction treated with intravenous (IV) thrombolysis at seven hours from symptom onset. Nineteen previously thrombolysed cases are reviewed. The patient underwent a clinical assessment, followed by an MRI of the spine. He was thrombolysed with a recombinant tissue plasminogen activator. Neurological severity was assessed at presentation and 24 hours using the National Institute of Health Stroke Scale (NIHSS), and disability at three months was evaluated using a modified Rankin scale (mRS). A middle-aged man presented with acute-onset paraplegia (NIHSS 9). MRI with T2-weighted sagittal, axial, and diffusion-weighted images showed hyperintensity from D10 to LI vertebral levels. He was thrombolysed at 428 minutes, leading to mild clinical improvement at 24 hours (NIHSS 7). At three months, he could walk with support (mRS 3). Nineteen cases of acute spinal cord infarction treated with IV thrombolysis have been reported. Clinical outcome at three months is available for 16 patients: seven (44%) had a good outcome (mRS 0-2); this is the first reported case of spinal cord infarction treated with thrombolysis at seven hours. Clinical trials to confirm the efficacy and safety of thrombolysis in spinal cord infarcts are needed.
    Language English
    Publishing date 2024-03-11
    Publishing country United States
    Document type Case Reports
    ZDB-ID 2747273-5
    ISSN 2168-8184
    ISSN 2168-8184
    DOI 10.7759/cureus.55983
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Comparative Study of Recombination Dynamics in Optimized Composition of Sn-

    Singh, Shivam / Kabra, Dinesh

    ACS applied materials & interfaces

    2021  Volume 13, Issue 35, Page(s) 42297–42306

    Abstract: The energy band gaps of Pb halide perovskites are higher than the optimal band gap required for single-junction solar cells, governed by the Shockley-Queisser radiative limit. The pure Sn and Pb-Sn mixed-based perovskites have drawn significant attention ...

    Abstract The energy band gaps of Pb halide perovskites are higher than the optimal band gap required for single-junction solar cells, governed by the Shockley-Queisser radiative limit. The pure Sn and Pb-Sn mixed-based perovskites have drawn significant attention due to their ability to lead to lower band gaps and open a new door for all perovskite tandem applications. There has been continuous progress toward the rapid improvement in the power conversion efficiency of Sn and Pb-Sn mixed-based perovskite solar cells (PSCs). Along with efforts for efficiency, it is worth analyzing the in-depth recombination dynamics for further development of Sn-based PSCs. The lower bimolecular recombination rate constant (
    Language English
    Publishing date 2021-08-26
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.1c14152
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Visualization of Nanocrystallites in Organic Semiconducting Blends Using Cryo-Electron Microscopy.

    Bothra, Urvashi / Venugopal, Hariprasad / Kabra, Dinesh / McNeill, Christopher R / Liu, Amelia C Y

    Small methods

    2024  , Page(s) e2301352

    Abstract: The efficiency of an organic solar cell is highly dependent on the complex, interpenetrating morphology, and molecular order within the composite phases of the bulk heterojunction (BHJ) blend. Both these microstructural aspects are strongly influenced by ...

    Abstract The efficiency of an organic solar cell is highly dependent on the complex, interpenetrating morphology, and molecular order within the composite phases of the bulk heterojunction (BHJ) blend. Both these microstructural aspects are strongly influenced by the processing conditions and chemical design of donor/acceptor materials. To establish improved structure-function relationships, it is vital to visualize the local microstructural order to provide specific local information about donor/acceptor interfaces and crystalline texture in BHJ blend films. The visualization of nanocrystallites, however, is difficult due to the complex semi-crystalline structure with few characterization techniques capable of visualizing the molecular ordering of soft materials at the nanoscale. Here, it is demonstrated how cryo-electron microscopy can be utilized to visualize local nanoscale order. This method is used to understand the distribution/orientation of crystallites in a BHJ blend. Long-range (>300 nm) texturing of IEICO-4F crystallites oriented in an edge-on fashion is observed, which has not previously been observed for spin-coated materials. This approach provides a wealth of quantitative information about the texture and size of nanocrystallites, which can be utilized to understand charge generation and transport in organic film. This study guides tailoring the material design and processing conditions for high-performance organic optoelectronic devices.
    Language English
    Publishing date 2024-02-13
    Publishing country Germany
    Document type Journal Article
    ISSN 2366-9608
    ISSN (online) 2366-9608
    DOI 10.1002/smtd.202301352
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Comparative Study of Recombination Dynamics in Optimized Composition of Sn- Versus Pb-Based Perovskite Solar Cells

    Singh, Shivam / Kabra, Dinesh

    ACS applied materials & interfaces. 2021 Aug. 26, v. 13, no. 35

    2021  

    Abstract: The energy band gaps of Pb halide perovskites are higher than the optimal band gap required for single-junction solar cells, governed by the Shockley–Queisser radiative limit. The pure Sn and Pb–Sn mixed-based perovskites have drawn significant attention ...

    Abstract The energy band gaps of Pb halide perovskites are higher than the optimal band gap required for single-junction solar cells, governed by the Shockley–Queisser radiative limit. The pure Sn and Pb–Sn mixed-based perovskites have drawn significant attention due to their ability to lead to lower band gaps and open a new door for all perovskite tandem applications. There has been continuous progress toward the rapid improvement in the power conversion efficiency of Sn and Pb–Sn mixed-based perovskite solar cells (PSCs). Along with efforts for efficiency, it is worth analyzing the in-depth recombination dynamics for further development of Sn-based PSCs. The lower bimolecular recombination rate constant (k) is often attributed to the high performance of PSCs. Herein, we study the role of “B” cations in charge carrier recombination dynamics (CCRD) of ABX₃ (A = MA⁺, FA⁺, and Cs⁺; B = Pb²⁺, Sn²⁺, and X = I–)-based PSCs. We fabricated p–i–n configuration-based FA₀.₉₅Cs₀.₀₅PbI₃ (pure Pb), MA₀.₂₀FA₀.₇₅Cs₀.₀₅SnI₃ (pure Sn), and (MAPbI₃)₀.₄(FASnI₃)₀.₆ (Pb–Sn mixed) PSCs and compared the CCRD of all the three PSCs. We optimized the Sn-based perovskite thin film (pure Sn) in terms of moisture and thermal stability in order to minimize the error due to perovskite degradation. We note that despite having lower open-circuit voltage (VOC), a pure Sn-based PSC shows lower k than that of Pb–Sn mixed and pure Pb-based PSCs, which is a contradictory result. This slow relaxation lifetime of the charge carrier in Sn-based PSCs can be correlated with recombination through the defect states without introducing the quasi-Fermi-level splitting. Furthermore, our results suggest that the rate law of charge carrier decay has nonlinear dependence of k on n in Sn-based PSCs, whereas it is linear in the other two cases.
    Keywords comparative study ; electric potential difference ; films (materials) ; thermal stability
    Language English
    Dates of publication 2021-0826
    Size p. 42297-42306.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1944-8252
    DOI 10.1021/acsami.1c14152
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: Understanding the Microscopic Origin of the Contact Resistance at the Polymer-Electrode Interface.

    Patrikar, Kalyani / Rao, V Ramgopal / Kabra, Dinesh / Mondal, Anirban

    ACS applied materials & interfaces

    2023  Volume 15, Issue 42, Page(s) 49427–49435

    Abstract: Contact resistance ( ...

    Abstract Contact resistance (
    Language English
    Publishing date 2023-10-13
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.3c10260
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: 2,2'-Bipyridine derived doubly B ← N fused bisphosphine-chalcogenides, [C

    Mondal, Dipanjan / Sardar, Gopa / Kabra, Dinesh / Balakrishna, Maravanji S

    Dalton transactions (Cambridge, England : 2003)

    2022  Volume 51, Issue 17, Page(s) 6884–6898

    Abstract: 2,2'-Bipyridine based bisphosphine [ ... ...

    Abstract 2,2'-Bipyridine based bisphosphine [C
    Language English
    Publishing date 2022-05-03
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472887-4
    ISSN 1477-9234 ; 1364-5447 ; 0300-9246 ; 1477-9226
    ISSN (online) 1477-9234 ; 1364-5447
    ISSN 0300-9246 ; 1477-9226
    DOI 10.1039/d2dt00287f
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Kinetics of Triplet Exciton Energy-Transfer Processes in Triplet Sensitizer-Doped Fluorescent Polymers.

    Dey, Amrita / Kabra, Dinesh

    The journal of physical chemistry. A

    2019  Volume 123, Issue 23, Page(s) 4858–4862

    Abstract: Triplet sensitization is an important aspect for enhancing the performance of organic light-emitting diodes (OLEDs). The triplet-triplet annihilation (TTA) process is known to increase the efficiency of OLEDs. In this case, the time scale of triplet ... ...

    Abstract Triplet sensitization is an important aspect for enhancing the performance of organic light-emitting diodes (OLEDs). The triplet-triplet annihilation (TTA) process is known to increase the efficiency of OLEDs. In this case, the time scale of triplet diffusion is an important parameter. In this paper, we have studied the triplet energy-transfer process as a function of time scale and temperature in pure and phosphorescent molecule FIrpic (bis[2-(4,6-difluorophenyl)pyridinato-C
    Language English
    Publishing date 2019-05-31
    Publishing country United States
    Document type Journal Article
    ISSN 1520-5215
    ISSN (online) 1520-5215
    DOI 10.1021/acs.jpca.9b02984
    Database MEDical Literature Analysis and Retrieval System OnLINE

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