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Improving performance and stability of planar perovskite solar cells through grain boundary passivation with block copolymer
摘要： Organic-inorganic metal halide perovskite solar cells (PSCs) exhibit excellent photovoltaic performance but suffer from instabilities against moisture and heat due to the inherent hydroscopic nature and volatility of their organic components. Herein, we report that employing block copolymer F127 as the passivation reagent in conjunction with solvent annealing process can efficiently improve the performance and stability of corresponding organic-inorganic PSCs. It is anticipated that the hydrophilic poly(ethylene oxide) tails of F127 polymers connect with contiguous perovskite crystals and passivate defects at perovskite grain boundaries, whereas the dangling hydrophobic poly(phenyl oxide) centers suppress perovskite decomposition caused by moisture and heat. After the optimization of the F127 additive, the planar PSCs with champion power conversion efficiencies of 21.01% and 18.71% were achieved on rigid and flexible substrates, respectively. The F127 passivation strategy provides an effective approach for fabricating high-efficiency and stable PSCs.
关键词： flexible solar cells,block copolymer,perovskite solar cells,interface passivation,stability
更新于2025-10-22 19:40:53
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Improving performance of ZnO flexible dye sensitized solar cell by incorporation of graphene oxide
摘要： At today great interest has been paid to hydrogen production by water electrolysis due to their simplicity and low cost. Dye sensitized solar cell are promising devices as renewable electrical power source to achieve water electrolysis because they possess high theoretical ef?ciency compared with Si based solar cells. In this research, ZnO photo catalyst was modi?ed with graphene oxide (GO) by means of high energy milling. The anode of the ?exible dye-sensitized solar cell was fabricated by electrophoretic deposition of the photo catalyst onto ?exible electrodes. The obtained materials were characterized by FTIR, XRD, XPS and SEM–EDS. The ef?ciency and ?ll factor of ZnO and ZnO–GO cells were estimated from the I–V curve, measured under simulated sunlight. The obtained results demonstrate that ZnO–GO cell have higher ef?ciency compared with the ZnO cell. The latter can be explained by the better dispersion of ZnO that enlace the dye adsorption onto the fabricated anode and by the presence of GO that improve the absorption of photons from the light.
关键词： flexible solar cells,dye sensitized solar cell,graphene oxide,ZnO,electrophoretic deposition
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - High-Efficiency Corrugated Monocrystalline Silicon Solar Cells with Multi-Directional Flexing Capabilities
摘要： High efficiency, lightweight and low cost flexible solar cells have attracted a growing interest in the last decades due to their increased applications. Here, we show high-efficiency (19%) and large scale (5 × 5 inch wafer) monocrystalline silicon solar cells with multi-directional flexing capabilities. The flexing of rigid solar cells with interdigitated back contacts is achieved using a photolithography-less corrugation technique. Results show that linear patterns enable flexibility in one direction with a minimum bending radius of 5 mm while diamond patterns result in multi-directional flexibility with different minimum bending radii and robust electrical performance.
关键词： monocrystalline silicon,multi-directional flexing,flexible solar cells,corrugation technique,high efficiency
更新于2025-09-23 15:19:57
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Efficiency improvement of flexible Sb2Se3 solar cells with non-toxic buffer layer via interface engineering
摘要： Thin film Sb2Se3 solar cells have gained a worldwide attention as a highly potential Earth-abundant photovoltaic technology. While Sb2Se3 solar cells are typically fabricated in superstrate structure, substrate configuration devices offer versatility in substrate material choice particularly important for flexible devices. However, all substrate type Sb2Se3 solar cells use CdS as a buffer layer synthesized by chemical bath deposition method, during which Sb2Se3 surface is degraded limiting solar cell performance. Additionally, contamination layer has been reported to exist on Sb2Se3 surface after deposition under low vacuum conditions. In this study, we demonstrate a facile strategy to improve Sb2Se3 solar cell power conversion efficiency (PCE) by replacing CdS with In2S3 and applying a two-step treatment involving chemical etching and subsequent annealing. We show that a combined treatment which first removes the contamination layer and then passivates interface defects improves PCE more than three-fold, from 1.6% to 5.35%. Effective passivation of interface defects is ascribed to the formation of thin crystalline Sb2O3 layer on Sb2Se3 absorber surface after the treatment. In conclusion, optimized two-step treatment offers a simple and effective way to improve PCE and replacement of toxic CdS with In2S3 demonstrates new device design options towards flexible and non-toxic Sb2Se3 solar cells.
关键词： dangling bonds,thin films,flexible solar cells,Sb2Se3,In2S3
更新于2025-09-19 17:13:59
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Achieving efficient flexible perovskite solar cells with room-temperature processed tungsten oxide electron transport layer
摘要： For flexible perovskite solar cells, achieving high power conversion efficiency by using a room-temperature technology to fabricate a compact electron transport layer is one of the best options. Here, we develop an annealing-free, dopant-free, and amorphous tungsten oxide as electron transport layer by vacuum evaporation for flexible perovskite solar cells. The compact amorphous tungsten oxide electron transport layer with different thicknesses (0–50 nm) was directly deposited on flexible PEN/ITO substrate. A model of the improvement mechanism is proposed to understand how the thickness tailoring simultaneously enhances the crystallization and relaxes the trade-off between interface recombination and charge transfer. By optimizing the amorphous tungsten oxide thickness, the high homogeneous, uniform, and dense electron transport layer with a thickness of 30 nm is found to not only decrease the pinhole of the perovskite layer, but also enhance charge transport with reducing resistance. Furthermore, the mechanical bending stability revealed that, the fabricated perovskite solar cells show stable power conversion efficiency up to more than 1000 bending cycles. The room-temperature processed fabrication enables the amorphous tungsten oxide to become a potential electron transport layer candidate for the large-scale flexible perovskite solar cells, which becomes compatible with practical roll-to-roll solar cells manufacturing.
关键词： Electron transport layer,Amorphous tungsten oxides,Low temperature,Flexible solar cells,Interface recombination
更新于2025-09-16 10:30:52
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Optimized Process of Fully Spray-Coated Organic Solar Cells on Woven Polyester Cotton Fabrics
摘要： This paper presents the novel use of spray coating to fabricate organic solar cells on fabrics for wearable energy harvesting applications and optimises photovoltaic efficiency. A fully spray coated photovoltaic (PV) device fabricated on fabric has been successfully demonstrated with comparable power conversion efficiency to glass based counterparts. All the PV devices are characterised under AM 1.5 (100mW/cm2) irradiation using an ABET solar simulator. Device morphologies are examined by scanning electron microscopy (SEM). The aim of this study is to develop and optimise a method to obtain reproducible photovoltaic textiles using a fully spray coating processing at low temperature (<150 oC) on a standard 65/35 polyester cotton fabric. The main challenge when spray coating solar cells of less than a few micron thickness is the surface roughness of the polyester cotton fabric which is of the order of 150 μm. We report a maximum optimised efficiency of 2.7% achieved on a glass substrate and 0.02% on woven fabrics, respectively. This approach is suitable for the low cost integration of PV devices into clothing and other decorative textiles.
关键词： Organic solar cells,textile solar cells,wearable and flexible solar cells
更新于2025-09-12 10:27:22
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Lateral InSe p–n Junction Formed by Partial Doping for Use in Ultrathin Flexible Solar Cells
摘要： Two-dimensional InSe possesses good electrical conductivity, intrinsic and structural flexibility, high chemical stability, and a tunable band gap, enabling it to be a promising candidate for flexible and wearable solar cells. Here we construct a lateral p?n junction by partially doping molybdenum trioxide (MoO3) at the surface of the InSe monolayer. Our density functional theory calculations reveal that the strong hybridization between MoO3 and InSe induces a lateral built-in electric field in the partially doped substrate and promotes the effective separation of carriers. Under a large range of external stains, the doped InSe can maintain the direct band gap, and the lateral structure device exhibits power conversion efficiencies over 5% and high carrier mobility around 1000 cm2 V?1 s?1. In particular, a power conversion efficiency of 20.7% can be achieved with 10% compressive strain. The partially doped InSe monolayer is expected to be used as an ultrathin flexible solar cell.
关键词： lateral p?n junction,density functional theory,carrier mobility,flexible solar cells,power conversion efficiency,Two-dimensional InSe,molybdenum trioxide
更新于2025-09-11 14:15:04
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High Performance Roll-to-Roll Produced Fullerene-Free Organic Photovoltaic Devices via Temperature-Controlled Slot Die Coating
摘要： Solution-processed organic photovoltaics (OPVs) have continued to show their potential as a low-cost power generation technology; however, there has been a significant gap between device efficiencies fabricated with lab-scale techniques—i.e., spin coating—and scalable deposition methods. Herein, temperature-controlled slot die deposition is developed for the photoactive layer of OPVs. The influence of solution and substrate temperatures on photoactive films and their effects on power conversion efficiency (PCE) in slot die coated OPVs using a 3D printer-based slot die coater are studied on the basis of device performance, molecular structure, film morphology, and carrier transport behavior. These studies clearly demonstrate that both substrate and solution temperatures during slot die coating can influence device performance, and the combination of hot substrate (120 °C) and hot solution (90 °C) conditions result in mechanically robust films with PCE values up to 10.0% using this scalable deposition method in air. The efficiency is close to that of state-of-the-art devices fabricated by spin coating. The deposition condition is translated to roll-to-roll processing without further modification and results in flexible OPVs with PCE values above 7%. The results underscore the promising potential of temperature-controlled slot die coating for roll-to-roll manufacturing of high performance OPVs.
关键词： printed solar cells,flexible solar cells,3d printer,roll-to-roll,nonfullerene acceptor
更新于2025-09-09 09:28:46