- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Dopant-free hole transporting materials with supramolecular interactions and reverse diffusion for efficient and modular p-i-n perovskite solar cells
摘要： The rational design of dopant-free organic hole-transporting layer (HTL) materials is still a challenge for realizing high-efficient and stable p-i-n planar perovskite solar cells (pero-SCs). Here, we synthesized two π-conjugated small-molecule HTL materials through tailoring the backbone and conjugated side chain to carefully control molecular conformation. The resultant BDT-TPA-sTh containing a planar fused benzo[1,2-b:4,5-b′]dithiophene (BDT) core and a conjugated thiophene side chain showed the planar conformation. X-ray crystallography showed a favorable stacking model in solid states under the parallel-displaced π-π and additional S-π weak-bond supramolecular interactions, thus achieving an obviously increased hole mobility without dopants. As an HTL material in p-i-n planar pero-SCs, the marginal solubility of BDT-TPA-sTh enabled inverse diffusion into the perovskite precursor solution for assisting the subsequent perovskite film growth and passivating the uncoordinated Pb2+ ion defects. As a result, the planar p-i-n pero-SCs exhibited a champion power conversion efficiency (PCE) of 20.5% and enhanced moisture stability. Importantly, the BDT-TPA-sTh HTL material also showed weak thickness-photovoltaic dependence, and the pero-SCs with blade-coated BDT-TPA-sTh as a HTL achieved a 15.30% PCE for the 1-cm2 modularized device. This HTL material design strategy is expected to pave the way toward high-performance, dopant-free and printing large-area planar p-i-n pero-SCs.
关键词： hole-transporting materials,p-i-n planar perovskite solar cells,reverse diffusion,supramolecular interactions
更新于2025-09-23 15:21:01
-
Bilateral Interface Engineering for Efficient and Stable Perovskite Solar Cells using Phenylethylammonium Iodide
摘要： Achieving high efficiency and long-term device stability is a vital issue for the commercialization of organic-inorganic hybrid perovskite solar cells (PeSCs). In this work, phenyl ethyl-ammonium iodide (PEAI)-induced bilateral interface engineering was developed to improve the device efficiency and stability of methylammonium lead triiodide (MAPbI3)-based PeSCs. Introducing PEAI onto poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) layer modifies the surface properties of the PEDOT:PSS and facilitates the formation of a high-quality perovskite active layer with enlarged grains on the PEDOT:PSS. The PEA+ in the PEAI-PEDOT:PSS also alters the work function of the PEDOT:PSS, leading to a reduction in the energy difference between the PEDOT:PSS and MAPbI3 perovskite layer, which decreases energy loss during charge transfer. Additionally, depositing PEAI onto three dimensional (3D) perovskite yields a two dimensional/three dimensional (2D/3D) stacked structure for the perovskite active layer. Because the two dimensional (2D) top layer acts as a capping layer to prevent water penetration, the stability of the perovskite active layer is significantly enhanced. A PeSC device fabricated based on this combination exhibits enhanced power conversion efficiency and extended device lifetime compared to a pristine PeSC. Under high-humidity conditions (75 ± 5%), the PEAI-treated PeSC retains 88% of its initial power conversion efficiency (PCE) after 100 h. In contrast, a pristine PeSC device loses over 99% of its initial PCE after only 25 h under the same conditions.
关键词： high efficiency,perovskite solar cells,bilateral interface engineering,PEAI,long-term stability
更新于2025-09-23 15:21:01
-
Challenges and Approaches Towards Upscaling Assembly of Hybrid Perovskite Solar Cells
摘要： In recent times, the next generation of photovoltaic technologies accept perovskite solar cells (PSCs) as a different auspicious applicant as a result of their persistently developed efficiencies that achieve much solicitude from both the scientific and industrial societies. Even if PSCs are dignified toward commercial world through the photovoltaic module scale, significant challenges confusing industrialization remain. The recent efficiency of the solution-processed PSCs reach over 25% on lab-scale. However, a reproducible allocation to upscaling techniques of these processes still requires a highly controllable perovskite film formation. Different coating systems like blade, slot-die and spray coating as well as printing pathways like those that screen, inkjet, and gravure printing; besides vacuum deposition and laser patterning methods used widely as substitutions of spin coating towards the developing of PSC scale-up with large-area. Herein, the current review based on the practical potential of PSCs, strategies, challenges, and approaches on large-area scale PSCs module, through the different deposition techniques as well as functional materials in device architecture.
关键词： Hybrid,Perovskite Solar Cells,Challenges,Strategies,Upscaling
更新于2025-09-23 15:21:01
-
A two-fold engineering approach based on Bi2Te3 flakes towards efficient and stable inverted perovskite solar cells
摘要： Perovskite solar cells (PSCs) are currently the leading thin-film photovoltaic technology owing to their high power conversion efficiency (PCE), as well as their low-cost and facile manufacturing process. Two-dimensional (2D) materials have been reported to improve both the PCE and the stability of the PSCs when incorporated across the device’s layered configuration. Hereby, a two-fold engineering approach is implemented in inverted PSCs by using ultra-thin Bi2Te3 flakes, i.e.: (1) to dope the electron transport layer (ETL) and (2) to form a protective interlayer above the ETL. Thorough steady-state and time-resolved transport analyses reveal that our first engineering approach improves the electron extraction rate and thus the overall PCE (+8% vs. reference cells), as a result of the favourable energy level alignment between the perovskite, the ETL and the cathode. Moreover, the Bi2Te3 interlayer through the second engineering approach, facilitates further the electron transport and in addition protects the underlaying structure against chemical instability effects leading to enhanced device’s performance and stability. By combining the two engineering approaches, our optimised PSCs reach a PCE up to 19.46% (+17% vs. reference cells) and retain more than 80% of their initial PCE, after the burn-in phase, over 1100 h under continous 1 Sun illumination. These performances are among the highest reported in literature for inverted PSCs.
关键词： electron transport layer,Perovskite solar cells,Bi2Te3 flakes,stability,power conversion efficiency
更新于2025-09-23 15:21:01
-
Layered Ruddlesdena??Popper Perovskites with Various Thicknesses for Stable Solid-State Solar Cells
摘要： The present research comes up with optimizing the layers thickness of a Ruddlesden–Popper perovskite with the general formula of (S0.97S'0.03)2[Cs0.05(FA0.097MA0.03)0.95]n – 1Pbn(I0.97Br0.03)3n + 1 for efficient, stable solar cell applications. Such a triple-cation quasi-two-dimensional (2D) structure simultaneously contains two spacers, namely 5-ammonium valeric acid iodide (S) and tetra-n-octylammonium bromide (S'). Systematic studies showed that morphology, crystal structure, optical properties, photovoltaic performance, and internal resistances of this compound depended upon the value of the n integer. Field emission scanning electron microscopy set forth that the deposited films were composed of various morphologies depending on the n value. An increase in the n value resulted in improving the light absorption, reducing the band gap energy, and blue-shifting the photoluminescence peak. So as to fabricate solar cells, CuInS2 nanoparticles were employed as a novel hole-transporting material. The device based on the film having n = 4 value showed the highest power conversion efficiency of 10.2%. Electrochemical impedance spectroscopy demonstrated that the improved performance of this cell was mainly thanks to its low series resistance (11.68 Ω), and long electron lifetime (8.05 μs) as compared to all the fabricated cells. Moreover, this cell displayed a maximum external quantum efficiency of 82% among all the devices. The un-encapsulated solar cells showed that the output reduction directly depended on the n value so that the cell based on the n = 4 reached 82% of its initial power over 2500 h in ambient conditions.
关键词： tetra-n-octylammonium bromide,Ruddlesden–Popper structure,2D triple-cation perovskite,solar cells
更新于2025-09-23 15:21:01
-
Organic Ionic Plastic Crystals as Hole Transporting Layer for Stable and Efficient Perovskite Solar Cells
摘要： Organic ionic plastic crystals (OIPCs) are synthesized through a simple metal-free, cost-effective approach. The strategized synchronization of electron-rich phenoxazine with benzimidazolium iodide (OIPC-I) and bromide (OIPC-Br) salts lead to enhanced hole mobility and conductivity of OIPCs which is suitable for an efficient alternative to conventional organic hole transporting materials (HTMs) for stable perovskite solar cells (PSCs). The fabricated PSCs with OIPC-I as hole transporting layer yielded a power conversion efficiency of 15.0% and 18.1% without and with additive (Li salt) respectively, which are comparable with spiro-OMeTAD based devices prepared under similar conditions. Furthermore, the PSCs with OIPCs show good stability compared to the spiro-OMeTAD with or without additives. Here, first time benzimidazolium-based OIPCs have been used as an alternative organic HTM for perovskite solar cells, which opens a window for the design of effective OIPCs for highly efficient PSCs with long-term stability.
关键词： perovskite solar cells,organic ionic plastic crystals,phenoxazine donor,hole transporting materials
更新于2025-09-23 15:21:01
-
Stabilization of highly efficient and stable phasea??pure FAPbI3 Perovskite Solar Cells by Molecularly Tailored 2Da??Overlayers
摘要： Due to their attractive optoelectronic properties, metal halide APbI3 perovskites employing formamidinum (FA+) as A cation are presently the focus of intense research, The superior chemical and thermal stability of FA+ cations renders α-FAPbI3 more suitable for solar cell applications than methylammonium lead iodide (MAPbI3). However, its spontaneous conversion to the yellow non-perovskite phase (δ-FAPbI3) under ambient conditions poses a serious challenge for practical applications. Here, we report on the stabilization of the desired α-FAPbI3 perovskite phase by protecting it with a two-dimensional (2D) IBA2FAPb2I7 (IBA = iso-butylammonium overlayer, formed via stepwise annealing. Remarkably, the α-FAPbI3/IBA2FAPb2I7 based perovskite solar cell (PSC) reached a high power conversion efficiency (PCE) of close to 23%. In addition, it showed excellent operational stability, retaining ~85% of its initial efficiency under severe combined heat and light stress, i.e. simultaneous exposure with maximum power tracking to full simulated sunlight at 80 °C over a period of 500 h.
关键词： FAPbI3,Thermal Stability,Perovskite Solar Cells,Additive Engineering
更新于2025-09-23 15:21:01
-
4-Tert-butylpyridine-assisted low-cost and soluble copper phthalocyanine as dopant-free hole transport layer for efficient Pb- and Sn-based perovskite solar cells
摘要： The preparation of suitable hole transport material (HTM) is critical to the performance and stability of perovskite solar cells (PSCs) with low-cost. Herein, a mass producible and soluble copper phthalocyanine decorated with butoxy donor groups (CuPc-OBu) was designed as HTM and prepared by a facile two-step synthetic route. To generate high quality HTM film, 4-tert-butylpyridine (tBP) was doped into CuPc-OBu to prepare the film and then removed by annealing. Such a tBP-assisted strategy resulted in the best efficiency of the PSCs with lead trihalide perovskite up to 19.0% (small-area of 0.1 cm2) and 10.1% (the active area of 8.0 cm2 for the module device). And the best efficiency of the tin-based PSCs with CuPc-OBu reached to 6.9%. More importantly, the device with CuPc-OBu as HTM revealed the remarkably enhanced stability. This work provides a new strategy to improve the film-quality of free-doping HTMs and enhance the efficiency and stability of Pb- and Sn-based PSCs with low-cost.
关键词： copper phthalocyanine,hole transport material,perovskite solar cells
更新于2025-09-23 15:21:01
-
Fabrication of perovskite solar cell with high short-circuit current density (JSC) using moth-eye structure of SiOX
摘要： The performance of solar cells is determined by three factors: the open-circuit voltage (VOC), short-circuit current density (JSC), and fill factor (FF). The VOC and FF are determined by the material bandgap and the series/shunt resistance, respectively. However, JSC is determined by the amount of incident light in addition to the bandgap of the material. In this study, a moth-eye pattern was formed on a glass surface via direct printing to increase the amount of incident light and thus increase JSC. The moth-eye pattern is a typical antireflection pattern that reduces the reflection by gradually increasing the refractive index. A flat perovskite solar cell (F-PSC) and a moth-eye patterned perovskite solar cell (M-PSC) had JSC values of 23.70 and 25.50 mA/cm2, respectively. The power-conversion efficiencies of the F-PSC and M-PSC were 19.81% and 21.77%, respectively.
关键词： perovskite solar cells,hydrogen silsesquioxane,direct printing,moth-eye pattern
更新于2025-09-23 15:21:01
-
Rapid Scalable Processing of Tin Oxide Transport Layers for Perovskite Solar Cells
摘要： The development of scalable deposition methods for perovskite solar cell materials is critical to enable the commercialisation of this nascent technology. Herein, we investigate the use and processing of nanoparticle SnO2 films as electron transport layers in perovskite solar cells, and develop deposition methods for ultrasonic spray-coating and slot-die coating, leading to photovoltaic device efficiencies over 19%. The effects of post-processing treatments (thermal annealing, UV ozone and O2 plasma) are then probed using structural and spectroscopic techniques to characterise the nature of the np-SnO2/perovskite interface. We show that a brief ‘hot air flow’ method can be used to replace an extended thermal anneal, confirming that this approach is compatible with high-throughput processing. Our results highlight the importance of interface management to minimise nonradiative losses, as well as providing a deeper understanding of the processing requirements for large area deposition of nanoparticle metal oxides.
关键词： spray-coating,interfaces,SnO2,perovskite solar cells,scalable processing,tin oxide
更新于2025-09-23 15:21:01