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[NH3(CH2)6NH3]PbI4 as Dion-Jacobson Phase Bifunctional Capping Layer for 2D/3D Perovskite Solar Cells with High Efficiency and Excellent UV Stability
摘要： Currently, three-dimensional (3D) organic–inorganic hybrid metallic halide perovskites are emerging as optoelectronic materials, but they demonstrate poor stability against heat and moisture and are vulnerable to oxidation and photodegradation upon exposure to ultraviolet (UV) light. Herein, for the first time, 1,6-diaminohexane ammonium (HDAD+) is demonstrated to be a unique cation spacer to prepare a two-dimensional Dion-Jacobson phase (DJP) perovskite that is ultimately used to construct a 2D/3D stacking structure. Compared to 3D perovskites and Ruddlesden-Popper phase (RPP)-2D perovskites, the DJP-2D perovskite demonstrates superior UV stability and can efficiently protect the 3D layer underneath from being damaged by the UV light. Moreover, the DJP-2D perovskite can also act as an interfacial layer to passivate the defects located on top of the 3D perovskite, resulting in a notably increased photoluminescence lifetime and suppression of interfacial charge recombination. As a result, the power conversion efficiency (PCE) is enhanced from 19.22% (3D) to 20.31% (2D/3D) and is accompanied by improved moisture and thermal stabilities.
关键词： Dion-Jacobson phase,2D/3D stacking structure,UV stability,optoelectronic materials,perovskite solar cells
更新于2025-09-23 15:21:01
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Roll-to-Roll Slot-Die Coated P-I-N Perovskite Solar Cells Using Acetonitrile Based Single Step Perovskite Solvent System
摘要： Roll-to-roll coating of all active layers is demonstrated for a P-I-N perovskite solar cell stack, using a single step perovskite ink with an acetonitrile solvent system and flexible plastic substrate. A slot-die coating roll-to-roll process (with a common coating speed for all layers) is developed by using appropriate length meniscus guides as part of the coating head for each ink rheology. High performance devices are demonstrated with four roll-to-roll slot-die coated layers and evaporated top electrode. The drying conditions of the perovskite layer are optimized and found to be critical to achieving good performance. Multi solvent blend systems for the electron collection layer are developed that are more industrially compatible than the commonly used chlorobenzene solvent system and make use of a gradient of solvent volatilities to give both good macro film formation and rapid drying. A stabilised power conversion efficiency of 12.2% is demonstrated, that is the highest reported to date for devices with all layers other than the top electrode deposited roll-to-roll. This work demonstrates the feasibility of a roll-to-roll fabrication process for perovskite solar cells that could be transferred to a fully inline roll-to-roll process with all coating and drying stages made sequentially on one line running at a common coating speed and further demonstrates the potential to produce high efficiency photovoltaics using roll-to-roll fabrication methods.
关键词： Stabilised power conversion efficiency,Perovskite solar cells,Slot-die coating,Roll-to-roll,Acetonitrile solvent system
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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Choline Chloride-modified SnO2 Achieving High Output Voltage in MAPbI3 Perovskite Solar Cells
摘要： Choline chloride as a photosynthesis promoter is important for increasing plant yield, and we have found that it has a similar effect in perovskite solar cells (PSCs). Here, we propose the innovation of using molecular self-assembly methods to produce a choline chloride monolayer on the surface of the SnO2; this monolayer works as a passivation layer that reduces the surface oxygen vacancies and improves the performance of CH3NH3PbI3 (MAPbI3) PSCs. The MAPbI3 PSC based on SnO2 modified by choline chloride (Chol-SnO2) electron transport layer (ETL) achieves an optimal power conversion efficiency (PCE) of 18.90% under one solar illumination. The PCE is increased by 10% ~ 25% compared to the device without modification, and hysteresis is significantly reduced by eliminating the charge accumulation between the interface of the perovskite and ETL. More importantly, the MAPbI3 PSC based on Chol-SnO2 ETL exhibits a higher open-circuit voltage (VOC) of 1.145 V compared to the control device (1.071 V). This work provides a very simple and effective way to improve PSC performance, which has long-term significance for the sustainable development of energy.
关键词： self-assembled monolayer,choline chloride,SnO2,electron transporting layer,perovskite solar cells
更新于2025-09-23 15:21:01
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Compositional Engineering for Compact Perovskite Absorber Fabrication Toward Efficient Photovoltaics
摘要： The compactness of perovskite active layers plays an essential role in the energy conversion. In order to promote the crystal quality, poly(allylamine hydrochloride) (PAH) was employed as an additive to promote the crystal quality for the active layers. The cationic additive significantly enhanced the compactness of the perovskite absorber film, which promoted the charge transport efficiency, resulting in an average efficiency over 19%. The unique properties of PAH make it act as a “glue” to link the grain boundaries and promote the crystal quality, thus favoring the charge transfer and suppressing the recombination under the certain doping amount. Meanwhile, the stability of perovskite solar cells in humidity environments was dramatically promoted without encapsulation. The sample has a long shelf life (over 600 h). This strategy can also be used to guide the crystal development of other optoelectronic devices, such as light-emitting diodes and lasers, which have recently involved the hybrid perovskite materials.
关键词： crystal qualities,Cationic additive,stability in humidity,perovskite solar cells,recombination decrease
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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Tin halide perovskite films made of highly oriented 2D crystals enable more efficient and stable lead-free perovskite solar cells
摘要： Low toxicity and an ideal energy bandgap make 2D Ruddlesden-Popper tin-based halide perovskites a promising photovoltaic material. However, the disordered crystal orientation and the oxidation of Sn2+ to Sn4+ still need to be addressed. Here, we demonstrate that the annealing of FASnI3 assisted by phenyl ethyl ammonium chloride enables the formation of more ordered 2D tin-based perovskite crystals oriented vertically. We use in-situ synchrotron-based grazing incident X-ray diffraction (GIXRD) to correlate the higher crystal orientation to the better device performance. We measured a maximum power conversion efficiency of >9%. Furthermore, we demonstrate that the phenyl ethyl ammonium chloride acts as a barrier layer at the surface of the crystals protecting the tin from the oxidation. Hence, this work paves the way for more efficient and stable lead-free perovskite solar cells.
关键词： phenyl ethyl ammonium chloride,photovoltaic material,crystal orientation,lead-free perovskite solar cells,oxidation of Sn2+,2D Ruddlesden-Popper tin-based halide perovskites,power conversion efficiency
更新于2025-09-23 15:21:01
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Surface Passivation of Perovskite Film by Sodium Toluenesulfonate for Highly Efficient Solar Cells
摘要： Ionic defects at the surfaces of organolead halide perovskite films are detrimental to both the efficiency and stability of perovskite solar cells (PSCs). Herein, sodium p-toluenesulfonate (STS) is applied during the surface modification of perovskite layer for the first time, leading to the efficient surface passivation of the perovskite film and consequently significant enhancements in both efficiency and stability of mixed-cation PSC devices. Upon incorporating STS atop the perovskite layer, the power conversion efficiency of the Cs0.05MA0.12FA0.83PbI2.55Br0.45 (abbreviated as CsMAFA) mesoporous-structure mixed-cation PSC devices improves from 18.70% to 20.05% with reduced hysteresis. The sulfonate (–SO3–) anion of STS coordinates with the Pb2+ of CsMAFA perovskite, and the Na+ cation of STS electrostatically interacts with the anions (I–/Br–) of CsMAFA perovskite, resulting in the surface passivation of the CsMAFA perovskite film with reduced electron and hole trap state densities. In addition, STS modification induces an upshift of the valence band of perovskite, facilitating hole extraction from the perovskite layer to the hole transport layer with suppressed interfacial charge recombination. Moreover, such a trap state passivation of perovskite film leads to improvement of the ambient stability of PSC devices.
关键词： ionic defects,trap state passivations,perovskite solar cells,surface modifications,charge extractions
更新于2025-09-23 15:21:01
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Critical role of interface contact modulation in realizing low-temperature fabrication of efficient and stable CsPbIBr2 perovskite solar cells
摘要： CsPbIBr2 perovskite solar cells (PSCs) have received considerable concern due to their excellent stability. However, the interface defects and imperfect band alignment between electron transporting layer (ETL) and perovskite is one of the main reasons for hindering further efficiency improvement. Herein, we modulate the band alignment and perovskite crystallization of the ETL/perovskite interface by employing ZnO and SnO2 as ETL, which exhibit high electron mobility and can be fabricated at low temperature. Both ZnO and SnO2-based devices were fabricated at low temperature below 160 ℃. First, the effect of ZnO and SnO2 on the performance of CsPbIBr2 PSCs is systematically investigated. SnO2-based PSCs show a higher power conversion efficiency (PCE) of 10.81% as a consequence of improved Voc and fill factor (FF) as compared to 9.70% of ZnO counterpart, which is attributed to improved band alignment and perovskite crystallization, leading to enhanced electron extraction, reduced interface nonradiative recombination and improved carrier lifetimes. Remarkably, SnO2 ETL can also reduce hysteresis and improve device stability as compared to ZnO ETL. The present study unveils the critical role of interface contact modulation of CsPbIBr2 PSCs and provides an insightful strategy for preparing efficient and stable low-temperature inorganic PSCs.
关键词： Interface contact modulation,Perovskite solar cells,Band alignment,CsPbIBr2
更新于2025-09-23 15:21:01