Yazar "Mahapatra, Apurba" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim
    Öğe
    Effect of bromine doping on the charge transfer, ion migration and stability of the single crystalline MAPb(BrxI1-x)(3) photodetector
    (Royal Soc Chemıstry, 2021) Mahapatra, Apurba; Prochowicz, Daniel; Kruszynska, Joanna; Satapathi, Soumitra; Akın, Seçkin; Kumari, Hemant; Kumar, Pawan
    Organic-inorganic halide perovskites (OIHPs) have emerged as a promising semiconductor for the fabrication of efficient optoelectronic devices such as photodetectors (PDs). Among all the perovskite compositions, the mixed-halide MAPb(BrxI1-x)(3) formulations have gained more attention for photodetection application thanks to their tunable optoelectronic properties and great stability. However, there is still a lack of sufficient understanding of the effect of Br doping on the stability and physical properties of MAPb(BrxI1-x)(3) based PDs. In this work, we prepare a series of MAPb(BrxI1-x)(3) (x = 0, 0.04, 0.08, 0.12, and 0.16) single crystals (SCs) and investigate the influence of the Br content on the crystal structure, charge transport, ion migration, and recombination phenomena. Moreover, self-powered PDs with a structure of Pt/MAPb(BrxI1-x)(3) SC/Pt have been developed, and their optoelectrical properties at different wavelengths of light sources (blue, green, red, and white) have been studied. We found that all the PDs exhibit the highest photoresponse under white light indicating their potential for broad spectrum detection applications. Particularly, the MAPb(Br0.16I0.84)(3) SC PD exhibits the highest responsivity of 2.41 mA W-1 at white light intensity, while the highest detectivity of 15.41 x 10(10) Jones was observed for the MAPb(Br0.12I0.88)(3) SC PD due to the smaller amount of trap states and suppressed ion migration, as proved by impedance spectroscopy. Finally, the photostability and one-year shelf-life stability of the corresponding PDs are demonstrated.
  • [ X ]
    Öğe
    T-shaped-n-doped polycyclic aromatic hydrocarbons: a new concept of dopant-free organic hole-transporting materials for perovskite solar cells
    (Amer Chemical Soc, 2024) Wagner, Jakub; Chavan, Rohit D.; Kruszynska, Joanna; Ans, Muhammad; Mahapatra, Apurba; Ebiç, Murat
    Although metal halide perovskites are positioned as the most powerful light-harvesting materials for sustainable energy conversion, there is a need for a thorough understanding of molecular design principles that would guide better engineering of organic hole-transporting materials, which are vital for boosting the performance and stability of perovskite solar cells. To address this formidable challenge, here, we developed a new design strategy based on the curved N-doped polycyclic aromatic hydrocarbon merged with T-shaped phenazines being decorated with (phenyl)-di-p-methoxyphenylamine (OMeTAD)-N-PAH23/24 and -3,6-ditertbutyl carbazole (TBCz)-N-PAH25/26. As N-PAH23/24 exhibited satisfying thermal stability, the comparative studies performed with various experimental and simulation methods revealed a pronounced correlation between the depth of the central cyclazine core and the form of the T-shape units. This proved to be a crucial factor in controlling their pi-pi intermolecular interaction as well as self-assembly behavior with the perovskite layer, leading to enhanced humidity resistance, operational stability, and a maximum power conversion efficiency of 20.39% denoted for N-PAH23, which is superior to the benchmarked device with doped spiro-OMeTAD (19.23%). These studies not only resulted in optimized stability and device performance but also opened a conceptually new chemical space in the photovoltaic technology.