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Mechanism of photoluminescence intermittency in organic-inorganic perovskite nanocrystals
摘要： Lead halide perovskite nanocrystals have demonstrated their potential as active materials for optoelectronic applications over the past few years. Nevertheless one issue which hampers their applicability has to do with the observation of photoluminescence intermittency, commonly referred to as blinking, as in their inorganic counterparts. Such behavior, reported for structures well above the quantum confinement regime, has been discussed to be strongly related with the presence of charge carrier traps. In this work we analyze the characteristics of this intermittency and explore the dependence with the surrounding atmosphere, showing evidence for the critical role played by the presence of oxygen. We discuss a possible mechanism in which a constant creation/annihilation of halide-related carrier traps takes place under light irradiation, the dominant rate being determined by the atmosphere.
关键词： photoluminescence,Hybrid organic inorganic perovskites,spectroscopy,nanocrystal,blinking
更新于2025-09-23 15:23:52
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A Review: Crystal Growth for High-Performance All-inorganic Perovskite Solar Cells
摘要： Recently, halide perovskites have become one of the most promising materials for solar cells owing to their outstanding photoelectric performance. Among them, metal halide all-inorganic perovskites (CsPbX3; where X denotes a halogen) show superior thermal and light stability. In particular, the power conversion efficiency (PCE) of perovskite solar cells (pero-SCs) based on a CsPbX3 active layer has shown a steady increase from 2.7% to 19.03% with the improvement of the CsPbX3 crystal quality. In this review, we summarize methodologies that have been employed for controlling the growth of all-inorganic perovskite films so far, including precursor solution deposition, substrate modification, composition doping, and surface engineering. Furthermore, we discuss the effect of perovskite crystal characteristics on defects and perovskite film morphology, both of which are closely related to device performance. Finally, conclusions and perspectives are presented along with useful guidelines for developing all-inorganic pero-SCs with high PCE and robust stability.
关键词： light stability,halide perovskites,precursor solution deposition,all-inorganic perovskites,surface engineering,substrate modification,thermal stability,power conversion efficiency,CsPbX3,composition doping,solar cells,crystal growth
更新于2025-09-23 15:21:01
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Computational high throughput screening of inorganic cation based halide perovskites for perovskite only tandem solar cells
摘要： We search for homovalent alternatives for A, B, and X-ions in ABX3 type inorganic halide perovskites suitable for tandem solar cell applications. We replace the conventional A-site organic cation CH3NH3, by 3 inorganic cations, Cs, K, and Rb, and the B site consists of metals; Cd, Hg, Ge, Pb, and Sn This work is built on our previous high throughput screening of hybrid perovskite materials (Kar et al 2018 J. Chem. Phys. 149, 214701). By performing a systematic screening study using Density Functional Theory (DFT) methods, we found 11 suitable candidates; 2 Cs-based, 3 K-based and 6 Rb-based that are suitable for tandem solar cell applications.
关键词： tandem solar cells,inorganic perovskites,density functional theory
更新于2025-09-23 15:21:01
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Tailoring Component Interaction for Aira??Processed Efficient and Stable Alla??Inorganic Perovskite Photovoltaic
摘要： All-inorganic lead halide perovskites with potential stability improvement is promising candidate for optoelectronic applications. However, fundamental questions remain over the component interaction in the perovskite precursor solution due to the limitation of the most commonly used solvents of N,N-dimethylformamide (DMF) and dimethyl sulfoxide (DMSO). Here, we report a simple and very effective interaction tailoring strategy for all-inorganic CsPbI3-xBrx perovskites by involving ionic liquid solvent methylammonium acetate (MAAc). We found that C=O has strong interaction with lead (Pb2+) and the N-H…I hydrogen bonds formation are observed. The interaction enables the stable perovskite precursor solution and allows the high-quality production of pinhole-free, large grain size, and flat all-inorganic perovskite films by retarding the crystallization. With a one-step, without the necessity for antisolvent treatment, air-processing approach regardless of humidity, the corresponding photovoltaic cell exhibits a high efficiency of 17.10% along with long operation stability over 1500 h under continuous light illumination.
关键词： photovoltaic,component interaction,all-inorganic perovskites,stability,ionic liquid solvent
更新于2025-09-23 15:21:01
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Surface Plasmon Resonance Effect Enhanced CsPbBr <sub/>3</sub> Inverse Opals for Higha??Performance Inorganic Perovskite Solar Cells
摘要： Although all-inorganic CsPbBr3 are considered an ideal candidate for inorganic perovskite solar cells (PSCs) owing to their outstanding thermal- and moisture-resistance, it still suffers from unfavorable charge transfer process and limited light harvesting ability. Herein, CsPbBr3 inverse opal (IO) films coupled with Au nanoparticles (NPs) are rationally designed, and PSCs based on Au-CsPbBr3 IO achieve a stabilized photoelectric conversion efficiency up to 8.08%. By selectively tuning IO pore diameter, the slow photon region of CsPbBr3 IO and localized surface plasmon resonance (SPR) region from Au NPs can be modulated to be overlapped to enhance the performance of inorganic CsPbBr3 PSCs. The synergetic effect devotes to light utilization and charge transfer process, resulting in an enhanced light absorption capability and suppressed recombination rate of photogenerated electron–hole pairs. The introduction of Au not only triggers SPR effect, but also enhances efficient separation/injection of charge carriers owing to the Schottky barriers. Furthermore, it is revealed that simultaneous effect from SPR and IO photon effect are conducive to reduce exciton binding energy, enhancing exciton dissociation efficiency and leading to significant increase in free carrier density. This work provides a rational strategy for plasmonic metal/semiconductor composite light-absorber for high-performance inorganic PSCs.
关键词： inverse opal,inorganic perovskites,Au nanoparticles,surface plasmon resonance,slow photon effects
更新于2025-09-23 15:21:01
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Extrinsic Ion Distribution Induced Field Effect in CsPbIBr <sub/>2</sub> Perovskite Solar Cells
摘要： Excellent power conversion efficiency (PCE) and stability are the primary forces that propel the all-inorganic cesium-based halide perovskite solar cells (PSCs) toward commercialization. However, the intrinsic high density of trap state and internal nonradiative recombination of CsPbIBr2 perovskite film are the barriers that limit its development. In the present study, a facile additive strategy is introduced to fabricate highly efficient CsPbIBr2 PSCs by incorporating sulfamic acid sodium salt (SAS) into the perovskite layer. The additive can control the crystallization behaviors and optimize morphology, as well as effectively passivate defects in the bulk perovskite film, thereby resulting in a high-quality perovskite. In addition, SAS in perovskite has possibly introduced an additional internal electric field effect that favors electron transport and injection due to inhomogeneous ion distribution. A champion PCE of 10.57% (steady-output efficiency is 9.99%) is achieved under 1 Sun illumination, which surpasses that of the contrast sample by 16.84%. The modified perovskite film also exhibits improved moisture stability. The unencapsulated device maintains over 80% initial PCE after aging for 198 h in air. The results provide a suitable additive for inorganic perovskite and introduce a new conjecture to explain the function of additives in PSCs more rationally.
关键词： sulfamic acid sodium,additive engineering,inorganic perovskites,perovskite solar cells,moisture stability
更新于2025-09-23 15:21:01
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Estimation of the Rashba Strength from Second Harmonic Generation in 2D and 3D Hybrid Organic-Inorganic Perovskites
摘要： The Rashba e?ect (RE), caused by concurrent spin-orbit coupling and structural inversion asymmetry (SIA), has been invoked to explain outstanding optoelectronic properties of hybrid organic inorganic perovskites (HOIPs). The SIA in HOIPs also manifests itself in second harmonic generation (SHG). Here we establish a quantitative relation between the RE strength and the low-frequency SHG value in 2D and 3D HOIPs using a newly developed e?ective-mass model. The calculated SHG, which exhibits one- and two-photon resonances between the valence and conduction bands, approaches a ?nite value at low frequencies. Using the measured SHG values in literature, the estimated RE strength is 10?3 eV?A for 3D CH3NH3PbI3 and 4 × 10?2 eV?A for 2D (C4H9NH3)2PbI4. Our results facilitate a simple and reliable determination of the RE strength of 2D and 3D HOIPs and help quantify the impact of RE on various properties in HOIPs.
关键词： second harmonic generation,Rashba effect,hybrid organic-inorganic perovskites,structural inversion asymmetry,spin-orbit coupling
更新于2025-09-23 15:21:01
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Kinetics of Ion-Exchange Reactions in Hybrid Organic-Inorganic Perovskite Thin Films Studied by In Situ Real-Time X-ray Scattering
摘要： The exchange of ions in hybrid organic-inorganic perovskites with the general formula APbX3 (A = MA, FA; X = I, Cl, Br) is studied in five different systems using in situ real-time grazing incident X-ray diffraction (GIXD). In systems where the organic cation is exchanged, we find a continuous shift of the lattice parameter. The relative shift compared to the pure materials is used to quantify the exchange. Whether or not a conversion is possible, as well as the amount of exchanged cations, depends on the halide used. In the case of the interconversion of MAPbI3 and MAPbCl3, we observe a decay of the diffraction peaks of the original perovskite and the emergence of new peaks corresponding to the structure with the alternative halide. Moreover, we determined the relevant time scales of the growth and decay of the perovskite structures.
关键词： ion-exchange reactions,kinetics,in situ real-time X-ray scattering,thin films,hybrid organic-inorganic perovskites
更新于2025-09-23 15:21:01
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Higha??Efficiency CsPbI <sub/>2</sub> Br Perovskite Solar Cells with Dopanta??Free Poly(3a??hexylthiophene) Hole Transporting Layers
摘要： CsPbI2Br is emerging as a promising all-inorganic material for perovskite solar cells (PSCs) due to its more stable lattice structure and moisture resistance compared to CsPbI3, although its device performance is still much behind this counterpart. Herein, a preannealing process is developed and systematically investigated to achieve high-quality CsPbI2Br films by regulating the nucleation and crystallization of perovskite. The preannealing temperature and time are specifically optimized for a dopant-free poly(3-hexylthiophene) (P3HT)-based device to target dopant-induced drastic performance degradation for spiro-OMeTAD-based devices. The resulting P3HT-based device exhibits comparable power conversion efficiency (PCE) to spiro-OMeTAD-based devices but much enhanced ambient stability with over 95% PCE after 1300 h. A diphenylamine derivative is introduced as a buffer layer to improve the energy-level mismatch between CsPbI2Br and P3HT. A record-high PCE of 15.50% for dopant-free P3HT-based CsPbI2Br PSCs is achieved by alleviating the open-circuit voltage loss with the buffer layer. These results demonstrate that the preannealing processing together with a suitable buffer layer are applicable strategies for developing dopant-free P3HT PSCs with high efficiency and stability.
关键词： perovskite solar cells,inorganic perovskites,P3HT
更新于2025-09-23 15:19:57
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Lead (II) Propionate Additive and A Dopant-Free Polymer HTM for CsPbI2Br Perovskite Solar Cells
摘要： All-inorganic perovskites (CsPbI3 and CsPbI2Br), owing to their greater thermal stability compared to organic-inorganic hybrid perovskites, are becoming popular in perovskite photovoltaics but the problem that remains with CsPbI2Br (or CsPbI3) is the humidity-assisted phase transformation. Herein, we report about the formation of CsPbI2Br α-phase and improvement of its phase stability under ambient atmosphere (20-30 % relative humidity) by Pb (II) propionate additive in the CsPbI2Br precursor. Solar cells employing CsPbI2Br film with an optimum concentration of the additive (1 mol %), and a donor-acceptor type polymer (synthesized by us) as dopant-free hole transport material that has a better energy level matching with CsPbI2Br (compared to other polymers like P3HT, PTAA, asy-PBTBDT) work with a champion power conversion cell efficiency of 14.58 %. A continuous increase in the open-circuit voltage, reaching 1.36 V for 5 mol % of Pb (II) propionate manifests a remarkable defects-passivation effect by the additive.
关键词： Pb (II) propionate,All-inorganic perovskites,dopant-free hole transport material,solar cells,CsPbI2Br
更新于2025-09-23 15:19:57