A5078779529- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Organic Electronics and Photovoltaics
- Silicon and Solar Cell Technologies
- solar cell performance optimization
- Advancements in Solid Oxide Fuel Cells
- Solid-state spectroscopy and crystallography
- Nanocluster Synthesis and Applications
- Thin-Film Transistor Technologies
- Solar Radiation and Photovoltaics
- Advanced Condensed Matter Physics
- Solar Thermal and Photovoltaic Systems
- Semiconductor Quantum Structures and Devices
- Catalytic Processes in Materials Science
- Insect and Pesticide Research
- Organic and Molecular Conductors Research
- Silicon Nanostructures and Photoluminescence
- Thermal Expansion and Ionic Conductivity
- Luminescence and Fluorescent Materials
- Photovoltaic System Optimization Techniques
- Nanowire Synthesis and Applications
- Organic Light-Emitting Diodes Research
- Layered Double Hydroxides Synthesis and Applications
National Renewable Energy Laboratory
2019-2024
Arizona State University
2023-2024
University of Colorado Boulder
2022-2023
Universitat de València
2023
Rice University
2023
Colorado School of Mines
2023
Stanford University
2015-2019
Tandem perovskite cells The ready processability of organic-inorganic materials for solar should enable the fabrication tandem cells, in which top layer is tuned to absorb shorter wavelengths and lower remaining longer-wavelength light. difficulty making an all-perovskite cell finding a material that absorbs red end spectrum. Eperon et al. developed infrared-absorbing mixed tin-lead can deliver 14.8% efficiency on its own 20.3% four-terminal cell. Science , this issue p. 861
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
Tuning band gaps with three halides Tandem solar cells can boost cell efficiency by using two active layers to absorb the spectrum more completely, provided that are current-matched. Inorganic-organic perovskites tuned appropriate wide gap (∼1.7 electron volts) as top contained iodine and bromine or chlorine have short carrier diffusion lengths undergo photo-induced phase segregation. Xu et al. now report a method for incorporating chloride allows fabrication of stable triple-halide 1.67...
The development of highly stable and efficient wide-bandgap (WBG) perovskite solar cells (PSCs) based on bromine-iodine (Br-I) mixed-halide (with Br greater than 20%) is critical to create tandem cells. However, issues with Br-I phase segregation under cell operational conditions (such as light heat) limit the device voltage stability. This challenge often exacerbated by ready defect formation associated rapid crystallization Br-rich chemistry antisolvent processes. We combined a gentle...
The rapid rise in efficiency and tunable bandgap of metal-halide perovskites makes them highly attractive for use tandems on silicon. Recently we demonstrated a perovskite–silicon monolithic two-terminal tandem with 23.6% power conversion efficiency. Here, present work optical optimization to improve light harvesting that includes thinning out the top transparent electrode reduce front-surface reflection parasitic absorption; introducing metal fingers minimize series resistance losses;...
The wettability issue associated with the Me-4PACz hole-selective monolayer is solved by introduction of second component to precursor solution. This results in a similar performance while simultaneously significantly improving yield devices.
Abstract The authors investigate how chiral ligands attached to perovskite nanocrystal (PNC) surfaces structurally distort the lattice. Chiral electro‐optical properties of resulting PNCs are demonstrated through fabrication a circularly polarized light (CPL) detector with discrimination up 14% between left‐ and right‐handed CPL. Both experimental electronic‐structure‐based simulations combined provide insights into interactions (both structural electronic) organic PNCs. major finding is...
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...
Wide-bandgap perovskites are attractive top-cell materials for tandem photovoltaic applications. Comprehensive optical modeling is essential to minimize the losses of state-of-the-art perovskite/perovskite, perovskite/CIGS, and perovskite/silicon tandems. Such models require accurate constants wide-bandgap perovskites. Here, we report determined with ellipsometry spectrophotometry two new wide-bandgap, cesium-formamidinium-based We validate by comparing simulated quantum efficiency...
Low-bandgap Sn/Pb ABX3 perovskites have reached photovoltaic power conversion efficiencies >20%, but they usually poor stability due to the common use of acidic poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) hole transport layers and A-site cation compositions containing methylammonium (MA). Here, we develop a process enable high-quality MA-free perovskite films grown using gas quenching instead conventional antisolvents, which provides improved control film growth...
ALD vanadium oxide and a low-absorbing hole transport material (HTM) enable semi-transparent perovskite solar cells with high photocurrent thermal stability.
Robust contact schemes that boost stability and simplify the production process are needed for perovskite solar cells (PSCs). We codeposited hole-selective while protecting to enable deposition of SnO x /Ag without use a fullerene. The , prepared through atomic layer deposition, serves as durable inorganic electron transport layer. Tailoring oxygen vacancy defects in led power conversion efficiencies (PCEs) >25%. Our devices exhibit superior over conventional p-i-n PSCs, successfully...
Abstract Metal halide perovskites offer a wide and tunable bandgap, making them promising candidates for top‐cell absorbers in tandem photovoltaics. In this work, the authors aim to understand atomic layer deposition (ALD) precursor–perovskite interactions of tin oxide ALD system role organic fullerenes at perovskite–tin interface while establishing framework developing alternative perovskite‐compatible processes future. It is shown, case growth with tetrakis(dimethylamino)tin(IV) water on...
This review highlights applications of atomic layer deposition for third generation photovoltaics, including light absorption, barrier formation and passivation.
Colloidal quantum dots (CQDs) have received recent attention for low cost, solution processable, high efficiency solid-state photovoltaic devices due to the possibility of tailoring their optoelectronic properties by tuning size, composition, and surface chemistry. However, device performance is limited diffusion length charge carriers recombination. In this work, we show that band engineering PbS QDs achievable changing dipole moment passivating ligand molecules surrounding QD. The valence...
Mixed tin–lead halide perovskite solar cells have promising power conversion efficiencies, but long-term stability is still a challenge. Herein we examine the of 60:40 to better understand diminished device performance upon thermal treatment, both in ambient and inert atmosphere. Operando X-ray diffraction shows stable bulk structure absorber, leading hypothesis that surface chemistry dominates degradation mechanism. photoelectron spectroscopy reveals two new observations post-thermal...
Abstract Metal‐halide perovskites show promise as highly efficient solar cells, light‐emitting diodes, and other optoelectronic devices. Ensuring long‐term stability is now a major priority. In this study, an ultrathin (2 nm) layer of polyethylenimine ethoxylated (PEIE) used to functionalize the surface C 60 for subsequent deposition atomic (ALD) SnO 2 , commonly electron contact bilayer p–i–n The enhanced nucleation results in more continuous initial ALD that exhibits superior barrier...