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Excellent exciton luminescence of CsPbI3 red quantum dots in borate glass
摘要： We have fabricated CsPbI3 perovskite quantum dots in a borate glass by melt-quenching technique. Three representative samples with different treatment conditions are investigated. As treatment condition enhances, energy gap is extracted as 1.75-1.76eV, and photoluminescence peak is adjustable from 675 to 691nm. Full width at half-maximum (FWHM) varies from 43 to 37 nm. PL intensity first increases and then decreases with increasing excitation wavelength, but the peak wavelength and line-shape are independent. High PLQY values of 23.8%-61.4% are obtained. The high PLQY values are attributed to good crystal quality and less energy dissipation. PL lifetime is fitted as 24.0-28.2ns and 100.2-123.0ns for short and long lifetime components in bi-exponential function. For temperature from 25 to 125 oC, PL intensity decreases, but it is reversible. Exciton binding energy is extracted in the level of 375-454meV. The FWHM broadening from 39 to 49nm and peak blue-shift from 690 to 685nm are investigated.
关键词： Photoluminescence quantum yield,Lifetime,CsPbI3,Temperature dependence,Quantum dots glass,Exciton
更新于2025-11-14 15:23:50
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Study on Charge transportation and scaling behavior of CsPbI3 microwires
摘要： Cesium lead iodide (CsPbI3) has been prepared by a new experimental hazard free precipitation technique. X-ray diffraction spectra have been interpreted with Rietveld refinement which assures the orthorhombic phase of CsPbI3. Energy dispersive X-ray fluorescence spectra confirms the formation of ternary compound. Orthorhombic to cubic phase transition has been studied by observing hysteresis loop in R(T)-T plot for forward-reverse temperature scan. The intra-grain and inter-grain contribution of CsPbI3 to dielectric relaxation has been accounted by fitting the complex impedance plot (Cole-Cole plot). The value of FWHM in Z″(ω)-lnf or M″(ω)-lnf plot is greater than 1.141 decades which reveals the non-Debye type relaxation within material. The broad relaxation peak signifies that there is a distribution of relaxation time over a mean value. Moreover, Z″ & M″ have been plotted in scaled coordinate to check whether the distribution of relaxation time is temperature dependent or not. The frequency dependent relative permittivity represents the decreases of polarizations with frequency which have been successfully analyzed by Koop’s theory. Here, activation energies are equal for different formalism, suggests that the same type charge carriers involved in conduction as well as relaxation process. Ac conductivity has been interpreted by using Jonncher’s power law and frequency exponent (n) increases with temperature which suggests the presence small polaron hopping mechanism.
关键词： Joncher’s power law,dielectric relaxation,Rietveld,Hysteresis,Cole-Cole plot,CsPbI3 micro-wire
更新于2025-09-23 15:23:52
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Bright CsPbI <sub/>3</sub> Perovskite Quantum Dot Light-Emitting Diodes with Top-Emitting Structure and a Low Efficiency Roll-Off Realized by Applying Zirconium Acetylacetonate Surface Modification
摘要： Zirconium acetylacetonate used as a co-precursor in the synthesis of CsPbI3 quantum dots (QDs) increased their photoluminescence quantum efficiency to values over 90%. The top-emitting device structure on a Si substrate with high thermal conductivity (to better dissipate Joule heat generated at high current density) was designed to improve the light extraction efficiency making use of a strong microcavity resonance between the bottom and top electrodes. As a result of these improvements, light-emitting diodes (LEDs) utilizing Zr-modified CsPbI3 QDs with an electroluminescence at 686 nm showed external quantum efficiency (EQE) of 13.7% at a current density of 108 mA cm?2, which was combined with low efficiency roll-off (maintaining an EQE of 12.5% at a high current density of 500 mA cm?2) and a high luminance of 14 725 cd m?2, and the stability of the devices being repeatedly lit (cycled on and off at high drive current density) has been greatly enhanced.
关键词： CsPbI3 perovskite quantum dots,top-emitting light-emitting diodes,surface modification,zirconium acetylacetonate,efficiency roll-off
更新于2025-09-23 15:21:01
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High Phase Stability in CsPbI <sub/>3</sub> Enabled by Pba??I Octahedra Anchors for Efficient Inorganic Perovskite Photovoltaics
摘要： CsPbI3 inorganic perovskite has exhibited some special properties particularly crystal structure distortion and quantum confinement effect, yet the poor phase stability of CsPbI3 severely hinders its applications. Herein, the nature of the photoactive CsPbI3 phase transition from the perspective of PbI6 octahedra is revealed. A facile method is also developed to stabilize the photoactive phase and to reduce the defect density of CsPbI3. CsPbI3 is decorated with multifunctional 4-aminobenzoic acid (ABA), and steric neostigmine bromide (NGBr) is subsequently used to further mediate the thin films’ surface (NGBr-CsPbI3(ABA)). The ABA or NG cation adsorbed onto the grain boundaries/surface of CsPbI3 anchors the PbI6 octahedra via increasing the energy barriers of octahedral rotation, which maintains the continuous array of corner-sharing PbI6 octahedra and kinetically stabilizes the photoactive phase CsPbI3. Moreover, the added ABA and NGBr not only interact with shallow- or deep-level defects in CsPbI3 to significantly reduce defect density, but also lead to improved energy-level alignment at the interfaces between the CsPbI3 and the charge transport layers. Finally, the champion NGBr-CsPbI3(ABA)-based inorganic perovskite solar cell delivers 18.27% efficiency with excellent stability. Overall, this work demonstrates a promising concept to achieve highly phase-stabilized inorganic perovskite with suppressed defect density for promoting its optoelectronic applications.
关键词： inorganic perovskite,phase stability,PbI6 octahedra anchors,CsPbI3,defect density
更新于2025-09-23 15:21:01
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Decreasing Energy Loss and Optimizing Band Alignment for High Performance CsPbI3 Solar Cells through Guanidine Hydrobromide Post-Treatment
摘要： On account of the superior thermal stability and applicable band gap (~ 1.7 eV), the inorganic halide CsPbI3 perovskite solar cells (PSCs) have aroused intense interest in recent years. Nevertheless, the CsPbI3 PSCs are still facing a problem of high energy loss (Eloss) which leads to low open-circuit voltage (VOC). Herein, we developed efficient CsPbI3 PSCs through guanidine hydrobromide (GABr) post-treatment on the surface of CsPbI3 film. After optimizing, a supreme power conversion-efficiency (PCE) of 18.02% was obtained, which was higher than the original one (16.58%). By further studying, the characterization of passivation was found, which led to the reduced nonradiative recombination rate. Besides, the band alignment between CsPbI3 and interface layer is also optimized, leading to the decreased electron transport barrier for electron collection, and superb hole contact for furnishing a driving force in the hole transferring and forbidding electron to flow in the opposite direction.
关键词： energy loss,GABr,nonradiative recombination,CsPbI3,band alignment
更新于2025-09-23 15:21:01
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All-inorganic 0D/3D Cs4Pb(IBr)6/CsPbI3-xBrx Mixed-dimensional Perovskite Solar Cells with Enhanced Efficiency and Stability
摘要： The inorganic halide perovskite CsPbI3 has shown great promise in efficient solar cells. However, the α-phase CsPbI3 is thermodynamically unstable at room temperature, limiting its applications. Herein, we have successfully fabricated highly stable all-inorganic 0D/3D Cs4Pb(IBr)6/CsPbI3-xBrx mixed-dimensional perovskite solar cells. The 0D Cs4Pb(IBr)6 phase spontaneously distributes in the 3D CsPbI3-xBrx perovskite phase and facilitates the (100) preferential crystal orientation of the CsPbI3-xBrx crystals. Due to the reasonable energy level alignment and lattice match between (040) in 0D Cs4Pb(IBr)6 and (002) in 3D CsPbI3-xBrx crystals, a 0D-3D heterojunction structure formed. The defect passivation and non-radiative recombination suppression within the films effectively promote smooth carrier transport in the perovskite solar cells, boosting the efficiency to 14.77%. The devices retained 93.9% of the initial efficiency after 60 days in a nitrogen atmosphere. Moreover, a high efficiency of 10.52% has also been achieved in the 1 cm2-large solar cells due to the high uniformity and repeatability of the 0D/3D films.
关键词： Cs4Pb(IBr)6,heterojunction,CsPbI3-xBrx,all-inorganic perovskite solar cells,stability
更新于2025-09-23 15:21:01
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Synthesis of Highly-Oriented Black CsPbI <sub/>3</sub> Microstructures for High-Performance Solar Cells
摘要： Synthesis of a thin layer of perovskite with less pinholes and defects is vital for the construction of a high-performance perovskite solar cell (PSC). We report on an oriented attachment strategy to fabricate a black phase CsPbI3 highly-oriented quasi-single-crystalline microstructures film for constructing a mesoporous PSC device with enhanced power conversion efficiency, from 13.4% to 16.0%. The theoretical calculations and detailed in/ex situ characterizations demonstrate that the oriented attachment is driven by the predominant adsorption of dimethyl sulfoxide (DMSO) on the {212} facets of the yellow phase δ-CsPbI3 crystals which initially form a relatively oriented structure followed by phase transition to α-CsPbI3 crystals and merging into large highly-oriented quasi-single-crystalline microstructures film with {200} planes exposed under annealing. Our work demonstrates that the oriented attachment strategy enables the formation of highly-oriented quasi-single-crystalline perovskite microstructures films which are essential for realizing high-efficiency and stable thin film PSCs.
关键词： oriented attachment,DMSO,CsPbI3,perovskite solar cells,high-performance
更新于2025-09-23 15:21:01
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2Da??3D Cs <sub/>2</sub> PbI <sub/>2</sub> Cl <sub/>2</sub> a??CsPbI <sub/>2.5</sub> Br <sub/>0.5</sub> Mixed-Dimensional Films for All-Inorganic Perovskite Solar Cells with Enhanced Efficiency and Stability
摘要： The phase instability of cesium lead halide perovskite is still a substantial challenge hindering its application. A 2D-3D all-inorganic Cs2PbI2Cl2-CsPbI2.5Br0.5 perovskite solar cell was successfully developed to address this issue. The 2D Cs2PbI2Cl2 phase distributed among the grain boundaries of the 3D CsPbI3-xBrx grains. The existence of Cs2PbI2Cl2 effectively facilitated the (100) preferential crystal orientation of the CsPbI2.5Br0.5 crystals, promoting the carrier transport. The smooth transition region between the (003)2D//(001)3D interface indicated the formation of a 2D-3D heterostructure. Due to the improved crystal quality, high uniformity and repeatability, the efficiency of the solar cells with areas of 0.09 cm2, 1 cm2 and 2 cm2 significantly improved to 15.09%, 12.74%, and 10.01%, respectively. The PCE retained 95.3% of the initial efficiency after 60 days in a nitrogen atmosphere at room temperature and 80% of the initial efficiency at humidity of 70±10% RH under continuous heating at 80°C for 12 h.
关键词： heterojunction,CsPbI3-xBrx,Cs2PbI2Cl2,all-inorganic perovskite solar cells,stability
更新于2025-09-23 15:21:01
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Mn Doping CsPbI3 Film Towards High-Efficiency Solar Cell
摘要： A doping technique that introduces suitable elements into the host material is extensively utilized to modulate perovskite lattice structure, stabilize crystallographic phases and achieve various optical and electronic properties. In this work, we substitute Pb2+ in CsPbI3 film with Mn2+ to improve the phase stability of the material. The crystalline quality of perovskite materials with Mn2+ doping is significantly improved, and the defect densitys is reduced. The power conversion efficiency (PCE) of an inorganic perovskite solar cell with optimized Mn2+ doping (2%) reached 16.52 %, which is higher than the 15.05% of the reference, with an enhancement of ~ 10%. Simultaneously, the humidity and thermal stability were boosted by the Mn doping, which is attributed to the introduction of Mn shrinking the lattice of the perovskite material and enhancing the formation energy of the CsPbI3 film.
关键词： Power Conversion Efficiency,Mn-Doping,CsPbI3,Phase Stability,Perovskite Solar cell
更新于2025-09-23 15:21:01
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Simulated development and optimized performance of CsPbI3 based all-inorganic perovskite solar cells
摘要： Cesium lead iodide (CsPbI3), as one promising inorganic halide perovskite for higher stability, has received extensive attention in recent years. However, CsPbI3 based perovskite solar cells (PSCs) have yet to realize the high e?ciency achieved in organic-inorganic hybrid PSCs. In this work, we perform a device modeling by SCAPS-1D to investigate the limitation of CsPbI3 all-inorganic PSC (CsPbI3 i-PSCs) and improve its performance. For i-PSC, not only the absorber but all the layers should be composed of inorganic materials only. Therefore, several potential inorganic hole and electron transport layers (i-HTL and i-ETL) are compared ?rstly and the results reveal that Cu2O HTL and SnO2 ETL are the most suitable materials among them. Moreover, the device performance is further improved by optimizing the work function of back electrode, absorber thickness, doping density as well as defect density. Under optimized conditions, a conversion e?ciency of 21.31% is obtained for the FTO/SnO2/CsPbI3/Cu2O/Au i-PSC, indicating that there is much room for further performance enhancement.
关键词： CsPbI3,Device modeling,All-inorganic perovskite solar cell
更新于2025-09-23 15:19:57