School Of Basic And Applied Sciences

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    Synergistic Effect of Crystallization Control and Defect Passivation Induced by a Multifunctional Primidone Additive for High-Performance Perovskite Solar Cells
    (American Chemical Society, 2022-12-22T00:00:00) Saykar, Nilesh G.; Iqbal, Muzahir; Ray, Asim K.; Mahapatra, Santosh K.
    The ionic nature of organic-inorganic metal halide perovskites endows intrinsic defects at the surface of the polycrystalline films. Simultaneous defect passivation during the growth of perovskite films could inhibit defect formation to a great extent. Herein, the anticonvulsant drug primidone (PRM) is demonstrated as a novel additive to control the crystallization and defect passivation of perovskites. The spectroscopic measurements support theoretical predictions showing the strong interaction between active functional groups and PbI2. An amount of PRM is tuned to obtain the perfect perovskite films with improved grain size and crystallinity than their control counterparts. Efficient PbI antisite defect passivation suppresses the non-radiative recombinations, resulting in higher luminance intensity and significantly longer charge carrier lifetimes. The PRM-modified perovskite solar cells (PSCs) show a power conversion efficiency (PCE) of 18.73%, much higher than that of control PSCs (16.62%). The ambient stability of PRM-modified PSCs is meritoriously increased compared to control PSCs. The PRM-modified PSCs show stability retention of up to 85% of the initial PCE after 1000 h, while control PSCs retain only 25% of the initial PCE after 550 h. The multifunctional defect passivation approach with the PRM additive shows the effective way for the efficiency and stability improvement of PSCs. � 2022 American Chemical Society.
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    A dual stimuli responsive natural polymer based superabsorbent hydrogel engineered through a novel cross-linker
    (Royal Society of Chemistry, 2021-03-23T00:00:00) Mehra, Saloni; Nisar, Safiya; Chauhan, Sonal; Singh, Gurmeet; Singh, Virender; Rattan, Sunita
    Natural protein-based polymers may serve as a potential source for developing advanced porous organic macromolecules, possessing exquisite control over the pores, which impart exceptional properties to these materials. Here, we describe a strategy to design, synthesize and develop an intelligent, dual stimuli responsive highly porous grafted polymer with exquisite control over the functionality of pores. The monomer 2-(4-((acrylamido)methyl)-1H-1,2,3-triazol-1-yl)-4-vinylbenzoic acid as a cross-linker, having pH responsive (acidic functional groups) and thermo-responsive (triazole and acrylamide groups) functional groups, was successfully prepared via click chemistry, for grafting onto the backbone of the natural polymer soy protein isolate (SPI) via microwave irradiation. Alkene groups were introduced at both the sides of the monomer, prior to grafting with SPI. Furthermore, to increase the hydrogen bonding network in the polymer, the pH responsive crosslinker 4-(4-hydroxyphenyl)butanoic acid (HPBA) was introduced while grafting. The grafted soy protein isolate polymer, SPI-g-[2-(4-((acrylamido)methyl)-1H-1,2,3-triazol-1-yl)-4-vinylbenzoicacid-co-4-(4-hydroxyphenyl) butanoic acid]-g-SPI, [SPI-g-(ATVBA-co-HPBA)-g-SPI], is characterized by using TGA for thermal stability, SEM and TEM for visual confirmation, NMR, LCMS and FTIR for grafting confirmation, XRD for crystallinity, MTT assay for cytotoxicity, and BET for analyzing the porous network structure. The size and morphological changes of [SPI-g-(ATVBA-co-HPBA)-g-SPI] are studied under different parameters for its potential use as an advanced porous macromolecule based superabsorbent polymer (SAP). � 2021 The Royal Society of Chemistry.