A5069325240- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Advanced Semiconductor Detectors and Materials
- Perovskite Materials and Applications
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Semiconductor materials and interfaces
- solar cell performance optimization
- Silicon and Solar Cell Technologies
- Thin-Film Transistor Technologies
- Superconducting and THz Device Technology
- ZnO doping and properties
- Organic Light-Emitting Diodes Research
- Photovoltaic System Optimization Techniques
- Electronic Packaging and Soldering Technologies
- Semiconductor materials and devices
- Nanowire Synthesis and Applications
- Molecular Junctions and Nanostructures
- Photovoltaic Systems and Sustainability
- Physics of Superconductivity and Magnetism
- Carbon Nanotubes in Composites
- Copper-based nanomaterials and applications
- Thermal Radiation and Cooling Technologies
- Terahertz technology and applications
- Solid-state spectroscopy and crystallography
National Renewable Energy Laboratory
2016-2025
Colorado School of Mines
2008-2024
Loughborough University
2024
Drexel University
2023
University of Florida
2023
First Solar (United States)
2023
New York University
2023
Twin Cities Orthopedics
2023
University of Minnesota
2023
University of Illinois Chicago
2022
Abstract Improving the long-term stability of perovskite solar cells is critical to deployment this technology. Despite great emphasis laid on stability-related investigations, publications lack consistency in experimental procedures and parameters reported. It therefore challenging reproduce compare results thereby develop a deep understanding degradation mechanisms. Here, we report consensus between researchers field for testing cell stability, which are based International Summit Organic...
We describe here a simple, all-inorganic metal/NC/metal sandwich photovoltaic (PV) cell that produces an exceptionally large short-circuit photocurrent (>21 mA cm−2) by way of Schottky junction at the negative electrode. The PV consists PbSe NC film, deposited via layer-by-layer (LbL) dip coating yields EQE 55−65% in visible and up to 25% infrared region solar spectrum, with spectrally corrected AM1.5G power conversion efficiency 2.1%. This device one largest currents any nanostructured...
Efficient all-perovskite tandem cells Organic-inorganic perovskite films can boost the output of conventional silicon solar in geometries by utilizing more light at blue end spectrum. Tandem that use only have been less successful because lack a suitable material with low bandgap replace silicon. Tong et al. report mixed tin-lead organic-inorganic containing small fraction guanidinium thiocyanate has bandgap, long charge-carrier lifetime, and efficiencies around 25%. Science , this issue p. 475
Abstract Over the past decade, global cumulative installed photovoltaic (PV) capacity has grown exponentially, reaching 591 GW in 2019. Rapid progress was driven large part by improvements solar cell and module efficiencies, reduction manufacturing costs realization of levelized electricity that are now generally less than other energy sources approaching similar with storage included. Given this success, it is a particularly fitting time to assess state photovoltaics field technology...
Abstract Metal halide perovskite solar cells (PSCs) have risen in efficiency from just 3.81% 2009 to over 25.2% today. While metal perovskites excelled efficiency, advances stability are significantly more complex and progressed slowly. The advance of which is readily measured, stability, can require literally thousands hours demonstrate, be expected given the rapid rate innovation field. In face changing absorber composition, synthetic approaches, device stack components it necessary...
Abstract As organic photovoltaic efficiencies steadily improve, understanding degradation pathways becomes increasingly important. In this paper, the stability under prolonged illumination of a prototypical polymer:fullerene active layer is studied without complications introduced by additional layers and interfaces in complete devices. Combining contactless photoconductivity with spectroscopy, structural characterization at molecular film level, quantum chemical calculations, mechanism...
We investigated and characterized the stability of power output from methylammonium lead iodide perovskite photovoltaic devices produced with various hole-collecting anode configurations consisting Au, Ag, MoOx/Au, MoOx/Ag, MoOx/Al. The unencapsulated were operated under constant illumination load conditions in laboratory ambient periodic current–voltage testing. Although initial efficiencies comparable across these configurations, varied significantly due to subtle differences electrode...
CdTe devices have reached efficiencies of 22% due to continuing improvements in bulk material properties, including minority carrier lifetime. Device modeling has helped guide these device by quantifying the impacts properties and different designs on performance. One barriers truly predictive is interdependence properties. For example, interfaces become more critical as particularly, hole density lifetime, increase. We present device-modeling analyses that describe effects recombination at...
Floating photovoltaic (FPV) systems, also called floatovoltaics, are a rapidly growing emerging technology application in which solar (PV) systems sited directly on water. The water-based configuration of FPV can be mutually beneficial: Along with providing such benefits as reduced evaporation and algae growth, it lower PV operating temperatures potentially reduce the costs energy generation. Although there is interest FPV, to date has been no systematic assessment technical potential...
To push perovskite solar cell (PSC) technology toward practical applications, large-area modules with multiple subcells need to be developed by fully scalable deposition approaches. Here, we demonstrate a scheme for module fabrication spray coating of TiO2 electron transport layer (ETL) and blade both absorber spiro-OMeTAD-based hole (HTL). The ETL remaining in the interconnection between significantly affects performance. Reducing thickness changes contact from Schottky diode ohmic...
Cadmium telluride (CdTe)-based cells have emerged as the leading commercialized thin film photovoltaic technology and has intrinsically better temperature coefficients, energy yield, degradation rates than Si technologies. More 30 GW peak (GWp) of CdTe-based modules are installed worldwide, multiple companies in production, shipping at up to 18.6% efficiency, lab cell efficiency is above 22%. We review developments science that occurred over approximately past decade. These achievements were...
CdTe-based solar cells exhibiting 19% power conversion efficiency were produced using widely available thermal evaporation deposition of the absorber layers on SnO2-coated glass with or without a transparent MgZnO buffer layer. Evaporating CdSe and CdTe sequentially by subsequent CdCl2 annealing establishes efffective CdSeTe band grading as well dense, large-grain films. These results show that high-performance II–VI photovoltaics can be made inexpensive, commercially systems need to build...
Combining two or more junctions into a tandem solar cell promises to deliver leap in power conversion efficiency that will help sustain continued growth installed photovoltaic (PV) capacity. Although tandems are now on the roadmaps of many PV manufacturers, much work remains before they ready for mass deployment. Accelerating their development requires advances fronts. In this article, we outline fundamentals and status PV, considering multiple technology pairings architectures. We then...
The role of the work function and interfacial chemistry on organic device performance was investigated by using a series contact materials. active layer standard blend poly(3-hexylthiophene) [6-6]-phenyl C61-butyric acid methyl ester. Over 100 devices were fabricated measured to obtain good statistics. Ba∕Al Ca∕Al electrodes performed best, with similar open-circuit voltages power conversion efficiencies. Device stability studies showed these two remained after six weeks degradation 11%–16%...
For organic photovoltaics (OPVs) to become a truly viable technology, it is critical correctly identify their degradation mechanism(s) and pave the way for strategies improve device lifetime. Changes in active component are often cited as leading pathway OPVs. In this shelf life study, we monitor performance after storage dark at ambient conditions show that decay behavior dominated by changes top metal electrode and/or metal–organic interface. Cross-sectional TEM reveals extensive void...
Abstract Networks made of single‐walled carbon nanotubes (SWNTs) and metallic nanowire networks, graphene, ultra‐thin metal films have all been proposed as replacements for transparent conducting oxides (TCOs) in photovoltaic other applications. However, only limited comparisons nanostructured networks TCOs are available. Several common figures merit that often used to compare the electrical optical performance contacts evaluated here, merits each method comparison discussed. Calculating...
We report on the effect of humidity structural, optical, and electrical properties formamidinium lead halide perovskite (FAPbI3; prepared by a solvent engineering method) device characteristics planar FAPbI3 solar cells. The relative strongly affects film morphology, which changes from uniform, fully covered at low (e.g., ∼2%) to an inhomogeneous consisting many voids (or pinholes) high (30%–40%). This morphological deterioration with increasing is also accompanied reduction crystallinity,...
Abstract The charge separation and transport dynamics in CdSe nanoparticle:poly(3‐hexylthiophene) (P3HT) blends are reported as a function of the shape CdSe‐nanoparticle electron acceptor (dot, rod, tetrapod). For optimization organic photovoltaic device performance it is crucial to understand role various nanostructures generation carriers. sample processing conditions carefully controlled eliminate any processing‐related effects on carrier with aim keeping conjugated polymer phase constant...