A5004389621- Perovskite Materials and Applications
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Chalcogenide Semiconductor Thin Films
- Organic Electronics and Photovoltaics
- Thin-Film Transistor Technologies
- Organic Light-Emitting Diodes Research
- Plasmonic and Surface Plasmon Research
- Thermal Radiation and Cooling Technologies
- Strong Light-Matter Interactions
- ZnO doping and properties
University of Sheffield
2020-2024
Abstract Self‐assembled monolayers (SAMs) are becoming widely utilized as hole‐selective layers in high‐performance p‐i‐n architecture perovskite solar cells. Ultrasonic spray coating and airbrush demonstrated here effective methods to deposit MeO‐2PACz; a carbazole‐based SAM. Potential dewetting of hybrid precursor solutions from this layer is overcome using optimized solvent rinsing protocols. The use air‐knife gas‐quenching then explored rapidly remove the volatile an MAPbI 3 film...
Abstract High temperature post‐deposition annealing of hybrid lead halide perovskite thin films—typically lasting at least 10 min—dramatically limits the maximum roll‐to‐roll coating speed, which determines solar module manufacturing costs. While several approaches for “annealing‐free” cells (PSCs) have been demonstrated, many are limited feasibility scalable fabrication. Here, this work has solvent‐engineered a high vapor pressure solvent mixture 2‐methoxy ethanol and tetrahydrofuran to...
The development of scalable deposition methods for perovskite solar cell materials is critical to enable the commercialization this nascent technology. Herein, we investigate use and processing nanoparticle SnO2 films as electron transport layers in cells develop ultrasonic spray coating slot-die coating, leading photovoltaic device efficiencies over 19%. effects postprocessing treatments (thermal annealing, UV ozone, O2 plasma) are then probed using structural spectroscopic techniques...
Spray coating is an industrially mature technique used to deposit thin films that combines high throughput with the ability coat nonplanar surfaces. Here, we explore use of ultrasonic spray fabricate perovskite solar cells (PSCs) over rigid, surfaces without problems caused by solution dewetting and subsequent "run-off". Encouragingly, find PSCs can be spray-coated using our processes onto glass substrates held at angles inclination up 45° away from horizontal, such devices having comparable...
The power conversion efficiencies (PCEs) of organic solar cells (OSCs) have risen dramatically since the introduction "Y-series" non-fullerene acceptors. However, demonstration rapid scalable deposition techniques to deposit such systems is rare. Here, for first time, we demonstrate a Y-series-based system using ultrasonic spray coating─a technique with potential significantly faster speeds than most traditional meniscus-based methods. Through use an air-knife rapidly remove casting solvent,...
An alumina interlayer is developed to facilitate state-of-the-art spray coated perovskite photovoltaics. This enables deposition onto the Me4PACz self-assembled monolayer (SAMs) resulting in power conversion efficiencies >20%.
The development of stable perovskite precursor solutions is critical if solution-processable solar cells (PSCs) are to be practically manufacturable. Ideally, such precursors should combine high solution stability without using chemical additives that might compromise PSC performance. Here, it was shown the shelf-life high-performing could greatly improved by storing at low-temperature need alter composition. Devices fabricated from stored for 31 days 4 °C achieved a champion power...
Controlling vertical segregation in organic photovoltaics (OPVs) is critical for achieving optimal solar cell performance and stability, requiring careful consideration of a range factors such as the surface energy miscibility components, solvent additive identity, film processing methods. In this work, we use neutron reflectivity to compare two different OPV systems: fullerene-based system (PBDB-T:PC71BM) non-fullerene-based (PBDB-T:ITIC), processed with amounts additive, 1,8-diiodooctane...
We have developed a simplified approach to fabricate high-reflectivity mirrors suitable for applications in strongly-coupled organic-semiconductor microcavity. Such are based on small number of quarter-wave dielectric pairs deposited top thick silver film that combine high reflectivity and broad bandwidth. Using this approach, we construct microcavity containing the molecular dye BODIPY-Br which bottom cavity mirror is composed layer coated by SiO2 Nb2O5 film, show undergoes polariton...
Defect management in perovskite solar cells (PSCs) via surface passivation has become a cornerstone maximizing both stability and solar‐to‐electrical power conversion efficiency (PCE) of devices by reducing defect densities and/or improving energetic alignment between the charge‐transporting layers. Despite this, few reports explore use roll‐to‐roll compatible technologies to deposit such interfacial treatments, limiting applicability real‐world contexts. In this work, iso‐butylammonium...
Integrating photovoltaic devices onto the surface of carbon-fiber-reinforced polymer substrates should create materials with high mechanical strength that are also able to generate electrical power. Such anticipated find ready applications as structural, energy-harvesting systems in both automotive and aeronautical sectors. Here, fabrication triple-cation perovskite n-i-p solar cells planarized is demonstrated, utilizing a transparent top ITO contact. These contain "wrinkled" SiO
Tin oxide (SnO x ) electron‐extraction layers are fabricated via a reactive electron‐beam evaporation process from metal source under partial pressure of oxygen. These then used in standard (n‐i‐p) architecture perovskite solar cells and achieve power conversion efficiencies up to 19.3%. The SnO deposition is performed onto substrates maintained at low temperature compared similar techniques, with films not requiring any subsequent high‐temperature post‐deposition annealing. This...
Abstract Invited for this month′s cover is the group of David Lidzey at University Sheffield. The image shows a futuristic view large‐scale perovskite solar cell (PSC) manufacture. This includes high‐volume roll‐to‐roll printing facility and cold‐storage PSC precursor solutions in large industrial fridges. Full Paper itself available 10.1002/cssc.202100332 .
Perovskite Solar Cells In article number 2200263, David George Lidzey and co-workers fabricated SnOx electron-extraction layers via a reactive electron-beam evaporation process from metal source under partial pressure of oxygen. These are then used in standard (n-i-p) architecture perovskite solar cells achieve power conversion efficiencies up to 19.3%. The deposition is performed onto substrates maintained at low temperature compared similar techniques, with films not requiring any...
Improving the photostability of light-harvesting blend film in organic photovoltaics is crucial to achieving long-term operational lifetimes that are required for commercialization. However, understanding degradation factors which drive instabilities complex, with many variables such as morphology, residual solvents, and acceptor or donor design all influencing how light oxygen interact film. In this work, we show films comprising a polymer (PBDB-T) small molecule (PC
Perovskite Solar Cells In article number 2300814, Ramadan, Lidzey, and co-workers used ultra-sonic spray coating to passivate spray-cast CsFAbI3 perovskite solar cells using iso-butylammonium bromide. This process created a quasi-2D surface-layer increased device open circuit voltage by 80 mV. Devices fabricated in this manner demonstrate power conversion efficiencies of up 21.0%, with work representing the first demonstration spray-coated surface passivation treatment that is compatible...
Self-Assembled Monolayers Carbazole-based self-assembled monolayers are becoming a dominant hole-transporting layer in p-i-n perovskite solar cells, combining stability, efficiency, and low-cost. In article number 2104848 by David G. Lidzey co-workers, spray coating airbrush pen of MeO-2PACz is used to fabricate high-quality transport layers. This combined with gas-quenched spray-coated layers, realize cells power conversion efficiencies excess 20%.