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Influence of bromide content on iodide migration in inverted MAPb(I <sub/>1?x</sub> Br <sub/>x</sub> ) <sub/>3</sub> perovskite solar cells
摘要： The effect of a systematic increase in the bromide content on mixed anion methyl ammonium lead halide, MAPb(I1?xBrx)3, perovskite solar cells is investigated. We show that at a critical bromide concentration (7.5%) we supress the slow impedance response from the cells. We link the changing impedance spectrum to a large increase in the activation energy for iodide motion. These results are corroborated by muon spin relaxation measurements, where we show that at the concentration of bromide typically used in high performance perovskite solar cells (17%) there is no sign of iodide motion in powders. Finally, we show JV curve hysteresis as a function of bromide content. The scan rate at which the maximum hysteresis index is observed does not change as the % Br is increased, leading us to conclude that the low frequency impedance response and the JV curve hysteresis are not caused by the same mobile ions.
关键词： bromide content,muon spin relaxation,perovskite solar cells,hysteresis,iodide migration,impedance spectroscopy
更新于2025-09-16 10:30:52
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[IEEE 2019 Third International Conference on Intelligent Computing in Data Sciences (ICDS) - Marrakech, Morocco (2019.10.28-2019.10.30)] 2019 Third International Conference on Intelligent Computing in Data Sciences (ICDS) - Photovoltaic Interfaced Shunt Active Power Filter Under Online-Varying Parameters Based On Fuzzy Logic Controller And Adaptive Hysteresis Band Current Controller
摘要： This paper explores performances of the photo-voltaic plant associated with shunt active power ?lter (PV-SAPF). The model guarantees uninterrupted power quality, with the bene?t of PV power injection. In order to improve the PV-SAPF dynamics and to reduce harmonic current distortion, the control of the proposed system is based on: 1) instantaneous PQ strategy for reference harmonic term identi?cation, 2) fuzzy logic controller for the Maximum power point tracking MPPT of the PV, 3) fuzzy logic based controller for DC capacitor voltage regulation, and 4) adaptive hysteresis current controller (AHCC) for the switching signals of the PV-SAPF system. The suggested control is performed in a Matlab/Simulink environment and compared with the conventional one using P& O algorithm, proportional integral controller and a ?xed hysteresis band controller. The results show that the proposed control adapted to PV-SAPF gives low value of total harmonic distortion THD and better dynamic performance in terms of references tracking under abrupt variation of the functioning point of the nonlinear load while applying a variable PV irradiance pro?le.
关键词： Fuzzy logic controller (FLC),Adaptive hysteresis current controller (AHCC),PV-SAPF,Dynamic performance,Total harmonic distortion (THD)
更新于2025-09-16 10:30:52
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Control of TiO2 electron transport layer properties to enhance perovskite photovoltaics performance and stability
摘要： This study demonstrates the effect of electron collection and transportation for TiO2 electron transport layer (ETL) of the mesoscopic perovskite solar cells (PSCs). The influence of compact TiO2 layer (c-TiO2) with various spray cycles, the particle size effect of mesoporous TiO2 (meso-TiO2) film and post-treatment of TiO2 electrode for perovskite solar cells have been studied systematically. We further optimize the meso-TiO2 thickness to enhance the electron collection and transport efficiency and to reduce the anomalous J-V hysteresis phenomenon of PSCs. After adjusting the fabrication process of TiO2 ETL, the highest performance of small cell PSC shows the power conversion efficiency (PCE) of 19.39% in the reverse scan and 19.12% in the forward scan, respectively. A sub-module PSC within an active area of 11.7 cm2 exhibits impressive PCE of 16.03% under the illumination of 100 mW/cm2 (AM1.5G). Moreover, it also shows an outstanding PCE of 25.49% under the illumination of 6000 lx of T5 indoor light source.
关键词： perovskite solar cell,hysteresis behavior,sub-module,TiO2,photovoltaic,electron transport layer
更新于2025-09-16 10:30:52
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Molecular Doping for Hole Transporting Materials in Hybrid Perovskite Solar Cells
摘要： Hybrid lead halide perovskites have been revolutionary in the photovoltaic research field, reaching efficiencies comparable with the most established photovoltaic technologies, although they have not yet reached their competitors’ stability. The search for a stable configuration requires the engineering of the charge extraction layers; in this work, molecular doping is used as an efficient method for small molecules and polymers employed as hole transport materials in a planar heterojunction configuration on compact-TiO2. We proved the viability of this approach, obtaining significantly increased performances and reduced hysteresis on compact titania-based devices. We investigated the photovoltaic performance correlated to the hole transport material structure. We have demonstrated that the molecular doping mechanism is more reliable than oxidative doping and have verified that molecular doping in polymeric hole transport materials leads to highly efficient perovskite solar cells, with long-term stability.
关键词： stability,perovskite solar cell,hysteresis,F4-TCNQ,molecular doping
更新于2025-09-16 10:30:52
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An electrically controlled light-scattering device based on liquid crystal/polymer microsphere composites
摘要： There is a widely applied prospect of electrical controlled liquid crystal (LC) light-scattering device. Numerous electrical controlled LC light-scattering technologies have been studied, but each technology has its own shortcomings, such as high driving voltage, high hysteresis, complex electrode structure, and serious heating. In this work, the composite of LC and polymer microspheres are used to fabricate light-scattering devices. This device is operated by the vertical electric field and does not require complex preparation process. LC/polymer microsphere composite has the advantages of low driving voltage and zero hysteresis. The role of microspheres in the composites is to change the size and density of a refractive-index-mismatched micro-domain. The effects of the ratio, particle size, and refractive index of microspheres on the optical characteristics of a composite are studied. The normal directional light transmittance at the transparent state and light-scattering state decreases with an increasing weight ratio of microspheres. The particle size of microspheres has negligible influence on the electro-optical properties of composites when the weight ratio of microspheres is small. The LCs doped with Polymethylsilsesquioxane (PMSQ) microspheres or polymethyl methacrylate (PMMA) microspheres are compared, and the mismatched refractive index and density of micro-domain show the influence on the electro-optical properties of the composites.
关键词： zero hysteresis,electro-optical properties,liquid crystal/polymer microsphere composites,Liquid crystal light-scattering device
更新于2025-09-16 10:30:52
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A Solution-Processed Spinel CuCo2O4 as an Effective Hole Transport Layer for Efficient Perovskite Solar Cells with Negligible Hysteresis
摘要： Optimal optoelectronic properties of interfacial layers in perovskite solar cells are essential for achieving high power conversion efficiency. We herein demonstrated a solution-processed spinel CuCo2O4 as a hole transport layer to use in high-performance perovskite solar cells. The solution-processed CuCo2O4 possessed high electrical conductivity, high optical transparency in UV-Vis-NIR, well-matched energy levels to perovskite and efficient hole transport capability to perovskite layer. The optoelectronic properties of CuCo2O4 was finely controlled by optimizing the annealing temperature, leading to 14.12% power conversion efficiency in planar perovskite solar cells. Another impressive advantage for CuCo2O4-based hole transport layer is a negligible hysteresis of the device at very low scan rate, that brought highly stable and reliable photovoltaic performance. All the results studied in this work suggest the bright future of solution-processed CuCo2O4 as a novel hole transport layer in perovskite solar cells with high efficiency and good stability.
关键词： CuCo2O4,Hysteresis,Efficiency,Hole transport layer,Perovskite solar cell
更新于2025-09-16 10:30:52
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Study of I-V Hysteresis of Tin Perovskite Solar Cells Using Capacitance-Voltage Measurement Coupled with Charge Modulation Spectroscopy
摘要： We investigated the I-V hysteresis of tin perovskite solar cells using capacitance-voltage (C-V) measurement coupled with charge modulation spectroscopy (CMS). The C-V characteristics and CMS of the (MASnI3)/C60/Al) solar showed that electrons inject from a C60 layer into an MASnI3 layer at positive bias voltage, while the injected electrons return to a C60 layer at negative bias voltage. Results suggested that I-V hysteresis of tin perovskite solar cells is originated from the carrier injection into an MASnI3 layer. This study provides a method for evaluating the carrier motion in tin perovskite solar cells.
关键词： charge modulation spectroscopy,perovskite,Hysteresis,tin,solar cell
更新于2025-09-16 10:30:52
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The physics of ion migration in perovskite solar cells: Insights into hysteresis, device performance, and characterization
摘要： Perovskite solar cells promise to reach the highest efficiencies at the lowest costs, but the mobile ions create challenges in both cell measurements and performance improvement. Being able to understand the ion migration mechanism and its impacts would help to solve relevant issues and may open up opportunities for further development. Although some efforts have been made here, explanations are often too exotic resulting in not only some controversies but the neglect of some important aspects addressable by familiar concepts. This paper uses familiar knowledge in solar cell device physics to explain the ion migration mechanism and its impacts under conditions of interests. It is shown that, when depletion layers contract such as in a forward current‐voltage scan, tardy ionic charges can distort the perovskite bands hence reduce the net currents before they move to new equilibriums, causing the hysteresis effect. As ion migration impacts the electron and hole distributions, it can affect the Shockley‐Read‐Hall and Auger processes differently, hence may either reduce or increase the ratio of radiative to nonradiative recombination. This previously unaddressed mechanism for variation in the electron‐hole recombination can explain photoluminescence quenching and enhancement as well as performance degradation and improvement during ion migration.
关键词： perovskite solar cells,ions,luminescence,recombination,hysteresis
更新于2025-09-12 10:27:22
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Core/Shell Nanocrystal Tailored Carrier Dynamics in Hysteresis-Less Perovskite Solar Cell with ~20% Efficiency and Long Operational Stability
摘要： The ambient stability, hysteresis and trap states in organo-halide perovskite solar cells (PSCs) are correlated to the influence of interlayer interfaces and grain boundaries. Astute incorporation of Cu2ZnSnS4 (CZTS) and Au/CZTS core/shell nanocrystals (NCs) can achieve the goal of simultaneously achieving better performance and ambient stability of the PSCs. With optimized Au/CZTS NC size and concentration in the photoactive layer, power conversion efficiency can be increased up to 19.97±0.6% with ambient air stability ?800 h, as compared to 14.46±1.02% for the unmodified devices. Through efficient carrier generation by CZTS and perovskite, accompanied by the plasmonic effect of Au, carrier density is sufficiently increased as validated from transient absorption spectroscopy. NCs facilitate the interfacial charge transfer by suitable band alignment, and removal of recombination centers such as metallic Pb0, surface defects or impurity sites. NC-embedding also increases the perovskite grain size and assist in pin-hole filling, reducing the trap state density.
关键词： Carrier Dynamics,Perovskite Solar Cells,Plasmonics,Optoelectronics,Energy Conversion and Storage,Operational Stability,Hysteresis-Less,Core/Shell Nanocrystals
更新于2025-09-12 10:27:22
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High Efficiency Perovskite Solar Cells: Materials and Devices Engineering
摘要： Since the first report on 9.7% efficient solid-state perovskite solar cell (PSC) in 2012, perovskite photovoltaics received tremendous attentions. Efforts to increase power conversion efficiency (PCE) have been continuously made. As a result, a record PCE of 25.2% was certified in 2019, which surpassed those achieved from the conventional solar cells based on CIGS and CdTe. The superb photovoltaic performance of PSC is related to the defect-tolerant property, the long carrier lifetime, the long diffusion length of photo-generated carriers, and the high absorption coefficient. In this review, materials and devices engineering are described for achieving stability and higher PCE in PSCs. From the practical point of view, key technologies for materials, coating, and device fabrication are described, which is expected to be helpful to achieve high efficiency PSCs. Moreover, interfacial engineering methodologies toward hysteresis-less and stable PSCs are also presented to give insight into better understanding ion migration and recombination in PSCs.
关键词： Solid-state,Perovskite solar cell,High efficiency,Hysteresis-less,Interfacial engineering,Stability,Coating
更新于2025-09-12 10:27:22