A5081395376- Laser Material Processing Techniques
- Silicon Nanostructures and Photoluminescence
- Thin-Film Transistor Technologies
- Advanced Surface Polishing Techniques
- Environmental law and policy
- Silicon and Solar Cell Technologies
- Climate Change Communication and Perception
- Atmospheric and Environmental Gas Dynamics
- Climate Change and Geoengineering
- Climate Change Policy and Economics
- Environmental Justice and Health Disparities
- Risk Perception and Management
- Research, Science, and Academia
- Cultural Heritage Materials Analysis
- Diamond and Carbon-based Materials Research
- Glass properties and applications
- Sustainability and Climate Change Governance
- Historical Medical Research and Treatments
- Contact Dermatitis and Allergies
- Global Energy and Sustainability Research
- Occupational exposure and asthma
- Biomedical and Engineering Education
- Nanowire Synthesis and Applications
- Legal Systems and Judicial Processes
- American Environmental and Regional History
University of Oxford
2022-2024
Harvard University
2012-2021
Stanford University
2017-2021
Harvard University Press
2012-2013
Building upon recent work on other major fossil fuel companies, we report new archival research and primary source interviews describing how Total responded to evolving climate science policy in the last 50 years. We show that personnel received warnings of potential for catastrophic global warming from its products by 1971, became more fully informed issue 1980s, began promoting doubt regarding scientific basis late ultimately settled a position 1990s publicly accepting while delay or...
The role of particular scientists in opposing policies to slow and halt global warming has been extensively documented. economists, however, received less attention. Here, I trace the history an influential group economic consultants hired by petroleum industry from 1990s 2010s estimate costs various proposed climate policies. economists used models that inflated predicted while ignoring policy benefits, their results were often portrayed public as independent rather than industry-sponsored....
Determining the onset of organized disinformation about global warming is critical for understanding its political history and evaluating responsibilities fossil fuel producers other relevant parties today. A newly discovered archival document shows American Petroleum Institute was promulgating false misleading information climate change in 1980, nearly a decade earlier than previously known, order to promote public policies favorable industry. This finding demonstrates early use...
Surface texturing of silicon using femtosecond (fs) laser irradiation is an attractive method for enhancing light trapping, but the laser-induced damage that occurs in parallel with surface can inhibit device performance. In this work, we investigate light-material interaction during by directly correlating formation pressure-induced polymorphs, fs-laser conditions, and resulting morphology microstructure scanning electron microscopy, micro-Raman spectroscopy, transmission microscopy. We...
Hyperdoped black silicon fabricated with femtosecond laser irradiation has attracted interest for applications in infrared photodetectors and intermediate band photovoltaics due to its sub-bandgap optical absorptance light-trapping surface. However, hyperdoped typically an amorphous polyphasic polycrystalline surface that can interfere carrier transport, electrical rectification, formation. Past studies have used thermal annealing obtain high crystallinity silicon, but causes a deactivation...
The photovoltaics market has been growing rapidly in the past decade or so, driven by policy support, economies of scale, and technological improvements. Continued advances manufacturing technologies may drive further cost reductions facilitate growth going forward. Here, we review one such potential advance: use ultrafast laser processing silicon photovoltaic production. We provide an overview current major capabilities silicon, including texturing, hyperdoping, combined texturing...
People are increasingly turning to courts combat climate crisis. In the early 2000s, fewer than 10 change litigation cases had been filed globally. By 2024, this number has grown over 2,500, with more half originating in United States. Some of these rely on extreme weather attribution science link damages anthropogenic change. Developing rigorous, legally useful assessments damage attributable is an pressing need.We present a framework for forecast-based impact which can physically...
Hyperdoped and textured silicon created with a femtosecond laser in the presence of SF 6 gas has highly absorbing surface extended spectral sensitivity infrared. The main drawback this micro‐ nanostructured material for photovoltaic (PV) cells is an increase charge‐carrier recombination at due to typically poor crystallinity layer. Laser annealing postprocessing black (b‐Si) used greatly reduce crystal structure defects while maintaining sub‐bandgap absorption. back side cell functionalized...
The fossil fuel divestment movement has been described as the fastest‐growing disinvestment in history, and recent years it continued to expand. Despite its growth, however, made little use of legal action, instead utilizing tactics public pressure persuasion, future role litigation is unclear. To consider litigation's potential challenges may face, I examine first only case thus far : Harvard Climate Justice Coalition et al. v President Fellows College (2015), which seven students...
Abstract This article characterizes key research gaps and opportunities for scientists across disciplines to do work that informs the rapidly growing number of climate lawsuits worldwide. It focuses on can be used inform legal decisions about responsibility greenhouse gas emissions damages. Relevant include claims filed against government corporate defendants alleging they have violated environmental, human rights, constitutional, tort, consumer protection laws due their contributions change...
Irradiating a semiconductor sample with intense laser pulses in the presence of dopants drastically changes optical, material and electronic properties sample. The these processed semiconductors make them useful for photodetectors and, potentially, intermediate band solar cells. This talk discusses processes that lead to doping surface texturing, both which increase optical absorptance material. We will discuss resulting material, including an band, as well our work on developing...
We have developed a technique, optical hyperdoping, for doping semiconductors to unusually high levels and endowing them with remarkable optoelectronic properties. By irradiating silicon (Si) train of femtosecond laser pulses in the presence heavy chalcogen (sulfur, selenium, tellurium) compounds, 100-300 nm thin layer Si is doped nonequilibrium (~1 at. %). Hyperdoped exhibits near-unity photon absorptance from ultraviolet (λ < 0.25 μm) mid-infrared > 2.5 μm), even though crystalline...