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Impact of the implementation of a mesoscopic TiO2 film from a low-temperature method on the performance and degradation of hybrid perovskite solar cells
摘要： High efficiencies of over 20% have been reported in the literature for both planar and mesoscopic hybrid perovskite solar cells, and the preferred configuration for scale-up and commercialization is still a matter of debate. The mesoscopic configuration generally requires a high-temperature processing step, which limits applications and makes the process less cost-effective. We have used low-temperature (LT) processing (≤120 °C) to fabricate high-efficiency planar and mesoscopic TiO2-based hybrid perovskite solar cells with comparable performance, highlighted by a champion LT mesoscopic solar cell with 16.2% efficiency. Photovoltaic efficiencies of 14–16% have been achieved for a mesoporous film thickness ranging from 120 to 480 nm by fine-tuning the precursor solution chemistry. The presence of the LT mesoporous layer improves the preservation of performance under conditions of relative humidity of 60%, especially under illumination. Impedance spectroscopy illustrates a similarity of the locus and kinetics of the recombination processes for both configurations. However, inductive loops usually related to ion migration are observed showing different characteristics between both configurations, pointing to the previously suggested correlation between ion migration and degradation. These results suggest that the beneficial role of a mesoporous TiO2 layer might be the stabilization of harmful defects at the perovskite/electron extraction layer interface, and indicate that interface engineering is critical to achieving improved long-term performance.
关键词： Low temperature TiO2,Perovskite solar cells,Impedance spectroscopy,Interfacial degradation
更新于2025-09-23 15:21:01
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Ultraviolet-ozone modification on TiO2 surface to promote both efficiency and stability of low-temperature planar perovskite solar cells
摘要： As a classical electron transport layer, the high crystallinity TiO2 has been widely used in perovskite solar cells (PSCs), however, its high-temperature preparation process elevates the fabrication cost and limits its application. Here, we report an ultraviolet-ozone assisted strategy to modify low-temperature TiO2 interface for PSCs. In addition to the more appropriate work function and reinforced built-in potential, the lattice strain of perovskite films crystallized on modified TiO2 has also been released in some degree. Ultrafast transient absorption technique is employed to provide an deep insight into the carrier dynamics, revealing that less non-radiative recombination exists in the modified device. Interestingly, transient surface photovoltage results demonstrate that ultraviolet-ozone modification can efficiently suppress the decomposition of perovskite films under light illumination. Taking advantage of these facts, this device exhibits better efficiency and remarkable stability. This demonstrated low-temperature strategy is a promising way for fabricating low-cost, efficient and stable perovskite device.
关键词： interface passivation,ultraviolet-ozone treatment,photocatalysis,low-temperature TiO2,perovskite solar cells
更新于2025-09-19 17:13:59
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Interlayer Engineering for Flexible Large-Area Planar Perovskite Solar Cells
摘要： Hybrid metal halide perovskite solar cells (PSCs) have consistently demonstrated high power conversion efficiency (PCE), although the best performing PSCs mostly employ high-temperature (500 oC) processed compact and mesoporous TiO2. Instead, low-temperature processed PSCs are desirable for implementation on flexible substrates and tandem solar cells. Here, we present a new method to achieve high efficiency flexible planar PSCs based on a low-temperature processed nonaqueous sol-gel route synthesized TiO2 and a guanidinium iodide (GuaI) salt passivation treatment of the perovskite film. We fabricate both rigid and flexible triple-cation perovskite (Cs0.05 (MA0.17FA0.83)0.95Pb(I0.85Br0.15)3, Eg ~1.58 eV) PSCs, achieving PCEs of 19.8% and 17.0% on glass and polyethylene naphtholate, (PEN) substrates respectively. At the same time, rigid and flexible high-bandgap double cation (FA0.85Cs0.15Pb(I0.7Br0.3)3, Eg ~1.72 eV) PSCs reached a PCE of 18.0 % and of 15.8%. Moreover, large area (1cm2) ~1.58 eV and ~1.72 eV-PSCs achieved PCEs of 18.2% and 16.7% PCE on glass substrates and of 16.2% and 13.9% on PEN substrates demonstrating the high uniformity of all the solar cell layers.
关键词： Solar Cells,Flexible,Guanidinium Iodide Passivation,Perovskite,Low Temperature TiO2
更新于2025-09-16 10:30:52
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Investigation of Low Temperature Processed Titanium Dioxide (TiO2) Films for Printed Dye Sensitized Solar Cells (DSSCs) for Large Area Flexible Applications
摘要： This paper reports a systematic study of the effect of nano-crystalline titanium dioxide (TiO2) formulations and annealing temperature conditions on the performance of dye sensitized solar cells (DSSCs) realized on fluorine tin oxide (FTO) glass substrates. DSSC fabrication is restricted to high temperature (>150 oC) process-compatible materials by the nano-crystalline process of the TiO2. DSSCs benefit from the use of lower cost materials and offer higher efficiency than organic solar cells but high processing temperatures limit their application on, for example, textile substrates. The aim of this study is to develop and optimize a low temperature processable TiO2 formulation suitable for both screen printing and spray coating. The results from this paper can be applied in future fabrication processes on flexible plastic and fabric substrates. The challenge of this research work is to achieve the smooth deposition and processing at 150 oC of TiO2 layers on glass substrates. We report a maximum DSSC efficiency of 4.3 % achieved by screen printing and 2.5 % achieved by spray coating on a glass substrate using the new low temperature process.
关键词： low temperature TiO2,Dye sensitized solar cells,flexibe solar cells
更新于2025-09-12 10:27:22