- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Iodine Induced PbI <sub/>2</sub> Porous Morphology Manipulation for High-Performance Planar Perovskite Solar Cells
摘要： The quality of the perovskite film has a vital influence on the performance of perovskite solar cells and it is quite desirable to simultaneously manipulate the crystallization and morphology of the perovskite film. In this study, conventional PbI2 is replaced with a PbI2/I2 mixed precursor during the first step of sequential deposition, causing the formation of a PbI2 porous nanostructure. By changing the content of I2 in the precursor, the morphology of the PbI2 film as well as the resulting perovskite film can be successfully modulated. With an optimal content of I2, a high-quality perovskite film with a pure phase and smooth surface can be achieved. As a result, the conversion efficiency of perovskite solar cells using a PbI2/I2 mixed precursor can be as high as 18.63%, compared to 16.89% for the reference device through traditional sequential deposition with a pure PbI2 precursor.
关键词： porous PbI2,iodine,perovskite,sequential deposition,solar cell
更新于2025-11-20 15:33:11
-
Bicontinuous network of electron donor-acceptor composites achieved by additive-free sequential deposition for efficient polymer solar cells
摘要： We report that sequential deposition of a highly crystalline polymer donor and a soluble fullerene acceptor leads to a well-defined interpenetrating network and enhanced power conversion efficiencies in bilayer polymer solar cells. Even without the use of solvent additives, layered thin films of poly[(5,6-difluoro-2,1,3-benzothiadiazol-4,7-diyl)-alt-(3,3?-di(2-octyldodecyl)-2,2’;5′,2’’;5″,2?-quaterthiophen-5,5?-diyl)] (PffBT4T-2OD) and [6,6]-phenyl C71-butyric acid methyl ester (PC71BM), as electron donor and acceptor materials, respectively, showed bicontinuous networks similar to those of a PffBT4T-2OD:PC71BM bulk-heterojunction (BHJ) thin film processed with 1,8-diiodooctane (DIO) as a solvent additive. Transmission electron microscopy results confirmed the BHJ-like morphology of the bilayered PffBT4T-2OD/PC71BM thin films. Bilayer solar cells fabricated without the DIO additive produced a power conversion efficiency of η ≈ 7.65%, which is even higher than that of a BHJ solar cell fabricated with the DIO additive (η ≈ 7.04%). These results demonstrate that a highly crystalline polymer donor and an electron-accepting small molecule can be a good combination for efficient bilayer polymer solar cells.
关键词： Bulkheterojunction,Nanomorphology,Sequential deposition,Organic solar cell,Bilayer
更新于2025-09-23 15:21:01
-
Sequential deposition method of TiO <sub/>2</sub> /CH <sub/>3</sub> NH <sub/>3</sub> PbI <sub/>3</sub> films for solar cell application
摘要： Seeking to study innovative solar cell compositions with the goal to reach the highest energy efficiency level attainable, the aim of this study was to develop a route to obtain a solar cell composed by hybrid perovskite (CH3NH3PbI3) using a sequential deposition method through the techniques of spin-coating and immersion. Initially, the deposition of PbI2 thin film of was performed on a FTO/glass substrate coated with TiO2, which was subsequently converted into perovskite crystals through spin coating using a CH3NH3I solution. The influence of the PbI2 layer thickness on the formation of CH3NH3PbI3 crystals was evaluated. The hydrophilic characteristic of TiO2 affects the distribution of the crystals nucleation sites, since PbI2 possesses a non-polar liquid characteristic. The characterization of the perovskite thin films showed that thickness affects directly the bandgap and the surface morphology, revealing the presence of dendritic structures and acicular crystals. Both growth and coverage increased for thinner layers of PbI2. It was also possible to observe an increased uniformity in the film for smaller PbI2 layers.
关键词： solar cell,immersion,sequential deposition,TiO2,spin-coating,perovskite,CH3NH3PbI3
更新于2025-09-16 10:30:52
-
Halogen Engineering for Operationally Stable Perovskite Solar Cells via Sequential Deposition
摘要： The performance of perovskite solar cells (PSCs) relies on the synthesis method and chemical composition of the perovskite materials. So far, PSCs that have adopted two-step sequential deposited perovskite with the state-of-art composition (FAPbI3)1?x(MAPbBr3)x (x < 0.05) have achieved record power conversion efficiency (PCE), while their one-step antisolvent dripping counterparts with typical composition Cs0.05FA0.81MA0.14Pb(I0.85Br0.15)3 with more bromine have exhibited much better long-term operational stability. Thus, halogen engineering that aims to elevate bromine content in sequential deposited perovskite film would push operational stability of PSCs toward that of antisolvent dripping deposited perovskite materials. Here, a Br-rich seeding growth method is devised and perovskite seed solution with high bromine content is introduced into a PbI2 precursor, leading to bromine incorporation in the resulting perovskite film. Photovoltaic devices fabricated by Br-rich seeding growth method exhibit a PCE of 21.5%, similar to 21.6% for PSCs having lower bromine content. Whereas, the operational stability of PSCs with higher bromine content is significantly enhanced, with over 80% of initial PCE retained after 500 h tracking at maximum power point under 1-sun illumination. This work highlights the vital importance of halogen composition for the operational stability of PSCs, and introduces an effective way to incorporate bromine into mixed-cation-halide perovskite film via sequential deposition method.
关键词： perovskite solar cells,sequential deposition,operational stability,halogen engineering,bromine
更新于2025-09-12 10:27:22
-
Sequential deposition route to efficient Sb <sub/>2</sub> S <sub/>3</sub> solar cells
摘要： We report a facile two-step sequential deposition method to prepare Sb2S3 thin films, where antimony acetate and thiourea are utilized as antimony and sulfur sources, respectively. The sequential deposition of two precursor materials followed by swift annealing at mild temperature leads to high-quality Sb2S3 films. The detailed reaction mechanism is revealed on the basis of structural and compositional analyses. By optimizing the concentration of thiourea and annealing temperature, uniform and flat Sb2S3 thin films are obtained with either sulfur-deficiency or sulfur richness. Finally, a planar heterojunction solar cell based on the as-prepared Sb2S3 film delivers a high power conversion efficiency of 5.69%, which is a top value for planar heterojunction Sb2S3 solar cells fabricated by a solution approach. This research provides a convenient and low-cost approach for the deposition of Sb2S3 films for efficient solar cell applications.
关键词： antimony acetate,Sb2S3,sequential deposition,thiourea,solar cells
更新于2025-09-11 14:15:04
-
δ‐CsPbI <sub/>3</sub> Intermediate Phase Growth Assisted Sequential Deposition Boosts Stable and High‐Efficiency Triple Cation Perovskite Solar Cells
摘要： Cs/FA/MA triple cation perovskite films have been well developed in the antisolvent dripping method, attributable to its outstanding photovoltaic and stability performances. However, a facile and effective strategy is still lacking for fabricating high-quality large-grain triple cation perovskite films via sequential deposition method a, which is one of the key technologies for high efficiency perovskite solar cells. To address this issue, a δ-CsPbI3 intermediate phase growth (CsPbI3-IPG) assisted sequential deposition method is demonstrated for the first time. The approach not only achieves incorporation of controllable cesium into (FAPbI3)1–x(MAPbBr3)x perovskite, but also enlarges the perovskite grains, manipulates the crystallization, modulates the bandgap, and improves the stability of final perovskite films. The photovoltaic performances of the devices based on these Cs/FA/MA perovskite films with various amounts of the δ-CsPbI3 intermediate phase are investigated systematically. Benefiting from moderate cesium incorporation and intermediate phase-assisted grain growth, the optimized Cs/FA/MA perovskite solar cells exhibit a significantly improved power conversion efficiency and operational stability of unencapsulated devices. This facile strategy provides new insights into the compositional engineering of triple or quadruple cation perovskite materials with enlarged grains and superior stability via a sequential deposition method.
关键词： CsPbI3 intermediate phase growth,stability,perovskite solar cells,sequential deposition,triple cation perovskite,grain growth
更新于2025-09-11 14:15:04
-
Unveiling the guest effect of N-butylammonium iodide towards efficient and stable 2D-3D perovskite solar cells through sequential deposition process
摘要： Improving the stability of hybrid organic-inorganic halide perovskite materials is urgent and essential for their applications in optoelectronic devices. Here, we introduce n-butylammonium iodide (BAI) into lead-iodide crystals as guest molecules. As a result of guest effect, only a small amount BA2PbI4 two-dimensional (2D) perovskite (n=1) is formed in PbI2-BAI films. Most of BAI crystals efficiently cut and squeeze the lattice network of lead iodide. The better orientation of 2D lead iodide crystals is obtained via this guest effect. In the following sequential deposition process, that BAI re-dissolve in MAI isopropanol (IPA) solution leads to a mesoporous structure of PbI2 and introduces a 2D perovskite (n=2) protect layer in 3D MAPbI3 after annealing. Finally, the morphology, crystallization and stability of CH3NH3PbI3 are simultaneously improved by the insertion of BAI guest molecules. Consequently, CH3NH3PbI3 PSCs with an optimized cutting behavior exhibited a power conversion efficiency of 18% and significantly improved the stability.
关键词： Ion exchange,Guest effect,2D-3D perovskite,Stability,Lattice compression,Sequential deposition
更新于2025-09-11 14:15:04