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Perovskite Photovoltaics on Roll-To-Roll Coated Ultra-thin Glass as Flexible High-Efficiency Indoor Power Generators
摘要： Indoor perovskite photovoltaics can help power the internet of things revolution, being highly ef?cient, low-cost, printable, and compatible with ?exible substrates. Castro-Hermosa et al. develop ?exible perovskite cells on roll-to-roll coated ultra-thin glass with excellent optoelectrical and mechanical properties, delivering ef?ciencies of 20.6%–22.6% under 200–400 lx LED illumination.
关键词： Flexible high-efficiency indoor power generators,Perovskite photovoltaics,LED illumination,Roll-to-roll coated ultra-thin glass
更新于2025-09-23 15:21:01
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Opal-Like Photonic Structuring of Perovskite Solar Cells Using a Genetic Algorithm Approach
摘要： Light management is an important area of photovoltaic research, but little is known about it in perovskite solar cells. The present work numerically studies the positive effect of structuring the photo-active layer of perovskite material. This structuration consists of a hybrid absorbing layer made of an uniform part and an opal-like part. A genetic algorithm approach allows us to determine the optimal combination among more than 1.4 × 109 potential combinations. The optimal combination provides an internal quantum efficiency of 98.1%, nearly 2% higher than for an equivalent unstructured photo-active layer. The robustness of the optimum against potential experimental deviations, as well as the angular dependency of the proposed structure, are examined in the present study.
关键词： photonic crystals,perovskite,photovoltaics,light management
更新于2025-09-23 15:19:57
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Selective UV Absorbance of Copper Chalcogenide Nanoparticles for Enhanced Illumination Durability in Perovskite Photovoltaics
摘要： The inherent optical and electrical properties of inorganic nanoparticles (NPs) give them high potential applicability in advanced energy devices. In this study, PEDOT:PSS was remodeled with aqueous synthesized copper-based chalcogenide NPs, and the novel properties were demonstrated. Raman spectra were used to analyze the changes in intrinsic binding of PEDOT:PSS and derive the main peak shift. X-ray diffraction spectral analysis showed that a photoactive layer stably formed on PEDOT:PSS with or without NPs. Perovskite photovoltaics (PPV) were fabricated with the remodeled PEDOT:PSS as the hole transport layer, and the electrical properties were evaluated. The charge factor and power conversion efficiency were higher in the NP-based PPVs than in the reference PEDOT:PSS devices. The charge behavior in the NP-based PPVs was investigated, and the following were identified: (1) improved device drive characteristics with photocurrent vs internal voltage, (2) tenfold increase in the hole mobility of the hole-only devices, (3) optimized efficiency in the photo-generated exciton dissociation test, and (4) improved charge transport resistance based on the impedance spectrum. The inherent optical properties of the NPs were examined in an illumination-durability test of the perovskite material without encapsulation. Under continuous light exposure, PPV in NP-based devices showed better electrical stability than in the reference devices. Field-effect scanning electron microscopy analysis indicated that perovskite particles in the NP-based samples have advanced morphological stability compared to the reference samples. Thus, integrating NPs is an efficient strategy for fabricating advanced PPVs with improved device efficiency and illumination-durability, in a more cost-effective and eco-friendly manner.
关键词： illumination durability,PEDOT:PSS modification/reforming effect,charge transport,copper-based chalcogenide NPs,perovskite photovoltaics
更新于2025-09-23 15:19:57
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Reduced-dimensional perovskite photovoltaics with homogeneous energy landscape
摘要： Reduced-dimensional (quasi-2D) perovskite materials are widely applied for perovskite photovoltaics due to their remarkable environmental stability. However, their device performance still lags far behind traditional three dimensional perovskites, particularly high open circuit voltage (Voc) loss. Here, inhomogeneous energy landscape is pointed out to be the sole reason, which introduces extra energy loss, creates band tail states and inhibits minority carrier transport. We thus propose to form homogeneous energy landscape to overcome the problem. A synergistic approach is conceived, by taking advantage of material structure and crystallization kinetic engineering. Accordingly, with the help of density functional theory guided material design, (aminomethyl) piperidinium quasi-2D perovskites are selected. The lowest energy distribution and homogeneous energy landscape are achieved through carefully regulating their crystallization kinetics. We conclude that homogeneous energy landscape significantly reduces the Shockley-Read-Hall recombination and suppresses the quasi-Fermi level splitting, which is crucial to achieve high Voc.
关键词： homogeneous energy landscape,open circuit voltage loss,Reduced-dimensional perovskite,photovoltaics,Shockley-Read-Hall recombination
更新于2025-09-19 17:13:59
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Surface-defect passivation through complexation with organic molecules leads to enhanced power conversion efficiency and long term stability of perovskite photovoltaics
摘要： Organic-inorganic hybrid lead halide perovskites (e.g., CH3NH3PbX3, X=Cl, Br, I) possess a unique combination of excellent electronic and photoelectrochemical properties including suitable and tunable bandgap, low exciton binding energy in the range of 9–80 meV, high extinction coefficient, and long electron and hole diffusion lengths, which make them excellent photovoltaic materials. The perovskite layer is at the core of perovskite solar cells (PSCs), whose quality would directly determine the device performance. The deficiency of long-term stability of the hybrid perovskite material has been one of the greatest barriers to the commercialization of PSCs. One of the most important strategies to achieve stable solar cells is to improve the intrinsic stability of the materials. Most recently, Wang et al. reported an in-depth systematic study on molecular defect passivation approaches through the interaction between organic functional groups and demonstrated both enhanced PCE and long term stability.
关键词： long term stability,power conversion efficiency,perovskite photovoltaics,surface-defect passivation
更新于2025-09-19 17:13:59
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Dopant‐Free Hole Transporting Molecules for Highly Efficient Perovskite Photovoltaic with Strong Interfacial Interaction
摘要： One of the attractive ways to develop efficient and cost-effective inverted perovskite solar cells (PVSCs) is through the use of dopant-free hole transporting materials (HTMs) with facile synthesis and a lower price tag. Herein, two organic small molecules with a fluorene core are presented as dopant-free HTMs in inverted PVSCs, namely, FB-OMeTPA and FT-OMeTPA. The two molecules are designed in such a way they differ by replacing one of the benzene rings (FB-OMeTPA) with thiophene (FT-OMeTPA), which leads to a significantly improved coplanarity as manifested in the redshift of the absorbance and a smaller bandgap energy. Density functional theory calculations show that FT-OMeTPA has a strong Pb2+–S interaction at the FT-OMeTPA/perovskite interface, allowing surface passivation and facilitating charge transfer across interfaces. As a result, the PVSCs based on FT-OMeTPA exhibit a much higher hole mobility, power conversion efficiency, operational stability, and less hysteresis as compared with devices based on FB-OMeTPA.
关键词： hole transporting materials,dopant-free,p-i-n,inverted perovskite photovoltaics,interfacial interactions
更新于2025-09-19 17:13:59
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Reverse Manufacturing Enables Perovskite Photovoltaics to Reach the Carbon Footprint Limit of a Glass Substrate
摘要： Innovative energy technologies with the lowest carbon footprint are needed. Our projections show that the photovoltaics (PVs) industry will have significant CO2 emissions in the transition away from fossil fuels. We demonstrate a reverse manufacturing concept for glass-solder-encapsulated, printed PV, based on in situ crystallization of emerging perovskite photo-absorbers. This concept reduces the CO2 emissions of PV 20-fold, approaching the ultimate lower limit of the glass substrate.
关键词： Perovskite Photovoltaics,Carbon Footprint,Glass Substrate,CO2 Emissions,Reverse Manufacturing
更新于2025-09-16 10:30:52
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Tailoring solvent coordination for high-speed, room-temperature blading of perovskite photovoltaic films
摘要： The efficiencies of small-pixel perovskite photovoltaics have increased to above 24%, while most reported fabrication methods cannot be transferred to scalable manufacturing process. Here, we report a method of fast blading large-area perovskite films at an unprecedented speed of 99 mm/s under ambient conditions by tailoring solvent coordination capability. Combing volatile noncoordinating solvents to Pb coordinating solvents achieves both fast drying and large perovskite grains at room temperature. The reproducible fabrication yields a certified module efficiency of 16.4%, with an aperture area of 63.7 cm2. This method can be applied for various perovskite compositions. The perovskite modules also show a small temperature coefficient of ?0.13%/°C and nearly fully recoverable efficiency after 58 cycles of shading, much better than commercial silicon and thin-film solar modules.
关键词： solvent coordination,room-temperature blading,scalable manufacturing,perovskite photovoltaics,module efficiency
更新于2025-09-11 14:15:04
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Tandems in the thick of it
摘要： Two-terminal all-perovskite tandem structures are promising as low-cost yet highly efficient solar cells, but their development is limited by the poor quality of the low bandgap absorber layer. Now, a processing method has been shown to enable the production of uniform, thick tin–lead perovskite layers, which translate into improved photovoltaic parameters.
关键词： perovskite photovoltaics,low bandgap absorber,power conversion efficiency,tin–lead perovskite,tandem solar cells
更新于2025-09-09 09:28:46
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Machine Learning for Perovskites' Reap-Rest-Recovery Cycle
摘要： Perovskite photovoltaics are efficient and inexpensive, yet their performance is dynamic. In this Perspective, we examine the effects of H2O, O2, bias, temperature, and illumination on device performance and recovery. First, we discuss pivotal experiments that evaluate perovskites’ ability to go through a reap-rest-recovery (3R) cycle, and how machine learning (ML) can help identify the optimum values for each operating parameter. Second, we analyze perovskite dynamics and degradation, emphasizing the research challenges surrounding this 3R cycle. We then outline experiments that could identify the impact of environmental factors on recovery for different perovskite compositions. Finally, we propose an ML paradigm for maximizing long-term performance and predicting device performance recovery, including a shared-knowledge repository. By reframing perovskites’ optoelectronic transiency within the context of recovery rather than degradation, we highlight a set of research opportunities and the artificial intelligence solutions needed for the commercial adoption of these promising solar cell materials.
关键词： machine learning,perovskite photovoltaics,environmental factors,reap-rest-recovery cycle,device performance
更新于2025-09-09 09:28:46