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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, PawanOrganic-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.Öğe Efficient and less-toxic indium-doped mapbi(3) perovskite solar cells prepared by metal alloying technique(Wıley-V C H Verlag, 2022) Tavakoli, Mohammad Mahdi; Fazel, Ziba; Tavakoli, Rouhollah; Akın, Seçkin; Satapathi, Soumitra; Prochowicz, DanielPerovskite materials with ABX(3) structure (A: organic, B: metal, and X: halides) have attracted tremendous attention due to their outstanding optoelectronic properties. Herein, a novel approach is developed using chemical vapor deposition (CVD), i.e., metal alloying of halide-perovskite domain via ion-transfer (MAHDI) for the growth of high-quality perovskite films, grown directly from a metal precursor. This technique easily enables us to replace the toxic Pb metal (B site) with other metals using alloying approach. Using the proposed approach, we fabricated stable and efficient Pb-In perovskite solar cells (PSCs) with a maximum power conversion efficiency (PCE) of 21.2%, which is more efficient than the pure Pb-based PSCs (19.23%). Our characterization results reveal that In-doping improves the crystallinity and photoluminescence (PL) of the perovskite film, resulting in higher photovoltaic properties in the device. To demonstrate the potential of our proposed method for other alloys, we also fabricated PSCs based on Pb-25%Sn alloy and obtained PCE of up to 15.2%. Overall, MAHDI technique opens up a new direction in the field of perovskite devices demonstrating great advantages such as lower price, higher performance, scalability, and fabrication flexibility.Öğe Investigation on the facet-dependent anisotropy in halide perovskite single crystals(American Chemical Society, 2022) Parikh, Nishi; Pandey, Manoj; Prochowicz, Daniel; Kalam, Abul; Tavakoli, Mohammad Mahdi; Satapathi, Soumitra; Akın, Seçkin; Yadav, PankajMetal halide perovskite (MHP) single crystals (SCs) are proven to possess superior optoelectronic properties compared to those of their polycrystalline thin film analogues. With the advancement and progress in the study of MHP SCs, it is found that the properties at the surface and bulk of SCs are significantly different. However, there are only a few studies present for the facet-dependent performance of MHP SCs. In this work, we have systematically investigated the anisotropic properties of naturally exposed facets ((100) and (112)) in MAPbI3 SCs. We studied the influence of temperature and illumination on the properties of these facets. It was found that hysteresis at the (112) facet is higher than that at the (100) facet because of the higher trap density of 1.17 × 1013 cm-3 at this facet as compared to the trap density of 2.11 × 1012 cm-3 for the (100) facet. Although there exist different kinds of defects at both the facets, the ion migration mechanism remains the same at both facets, which is confirmed by the obtained almost same activation energy of 0.378 and 0.308 eV for (100) and (112) facets, respectively, for ion migration. The photocurrent, responsivity, and EQE values further confirm anisotropic properties of both the facets in MAPbI3 SCs although they are the same from the crystallography point of view. Thus, this study provides a detailed and systematic investigation of the facet-dependent properties in MHP SCs.Öğe Predicting the state parameters of lithium ion batteries: The race between filter-based and data driven approaches(Royal Society of Chemistry, 2023) Pandey, Siddhi Vinayak; Parikh, Nishi; Prochowicz, Daniel; Akın, Seçkin; Satapathi, Soumitra; Tavakoli, Mohammad MahdiLithium ion batteries (LIBs) have revolutionized the era of electrical energy storage by offering high energy density and longer life cycles in various applications such as electric vehicles, electronic gadgets, satellites and power grids. To achieve optimum and reliable performance throughout their life cycle, accurate monitoring of their state parameters such as state of charge (SOC), state of health (SOH), and remaining useful life (RUL) needs to be estimated precisely. Filter-based and data driven techniques estimate these parameters accurately even under dynamic battery operation. In this paper, first, we have given details about experimental techniques through which LIB state parameters are estimated, but due to poor nonlinearity handling capacity of these models, we showcase the potential of various filter-based and data driven techniques with a variety of features extracted from LIBs. Subsequently, we discuss the working and performance of various filter based and data driven algorithms utilised in predicting the state parameters of batteries such as SOC, SOH & RUL in detail. Additionally, a comparative table comprising features, predictive techniques and performance is made to highlight the effectiveness of each method. Finally, we propose a strategy to improve the estimation accuracy of LIBs. Overall, the paper provides a comprehensive review of various estimating lgorithms and their potential in predicting the state parameters of LIBs with an aim to develop an intelligent framework for required applications and highlights the challenges which are yet to be overcome.Öğe Rationalizing the effect of polymer-controlled growth of perovskite single crystals on optoelectronic properties(American Chemical Society, 2022) Parikh, Nishi; Sevak, Parth; Jowhar Khanam, Sarvani; Prochowicz, Daniel; Akın, Seçkin; Satapathi, Soumitra; Tavakoli, Mohammad MahdiTo improve and modulate the optoelectronic properties of single-crystal (SC) metal halide perovskites (MHPs), significant progress has been achieved. Polymer-assisted techniques are a great approach to control the growth rate of SCs effectively. However, the resultant optoelectrical properties induced by polymers are ambiguous and need to be taken into the consideration. In this study, we have synthesized methylammonium lead triiodide (MAPbI3) SCs using polyethylene glycol (PEG) and polystyrene (PS) polymers where PEG contains oxygen functionalities and PS does not. We studied the electrical properties of these SCs under dark and illumination conditions. It was observed that PEG-assisted SCs showed few defects with lower photocurrent as compared to the PS-assisted ones because of defect-mediated conductivity. The results are further verified by transient current response, responsivity, and capacitance-frequency measurements. The present study sheds light on the polymer selection for the growth of MHP SCs and their optoelectronic properties.Öğe Recent progress of light intensity-modulated small perturbation techniques in perovskite solar cells(John Wiley and Sons Inc, 2021) Parikh, Nishi; Narayanan, Saranya; Kumari, Hemant; Prochowicz, Daniel; Kalam, Abul; Satapathi, Soumitra; Akın, SeçkinThe small perturbation frequency-resolved techniques have been powerful tools in unraveling the kinetic processes governing the operation of perovskite solar cells (PSCs). One such technique is electrochemical impedance spectroscopy (EIS). However, a thorough interpretation of the EIS response of PSCs is still lacking owing to the absence of a uniform electrical equivalent circuit. In this context, intensity-modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS) can be the link between the optical and electrical responses of PSCs and complement the IS technique. In this review, the progress made in interpreting the IMPS/IMVS response of various types of PSCs is summarized and diverse prospects are discussed. First, the basic theory and models present in the literature are discussed. Next, the IMPS/IMVS response of mesoporous and planar PSCs based on various physical parameters is discussed. At last, proposed future prospects for the development of this field are discussed.
