13 research outputs found
Counting Below the Curve: Combinatorial Proofs of Integral Formulas
Note from Isaac Hodes: the presentation and subsequent defense was the entirety of the comps. Student indicates no adviser assigned
hammerlab/ketrew: Ketrew 3.1.0: Performance and UI improvements
Improve display of programs and logs in the WebUI.
Add more User-level notifications for async-errors.
Add indexes to the DB.
Improve node-list display in the TextUI.
Remove and clean-out some code.
Add option ~safe_ids to job submission (on by default).
Fix build with Lwt ≥ 3.0.0.
Improve "Getting Started" documentation
Computational Pipeline for the PGV-001 Neoantigen Vaccine Trial
This paper describes the sequencing protocol and computational pipeline for the PGV-001 personalized vaccine trial. PGV-001 is a therapeutic peptide vaccine targeting neoantigens identified from patient tumor samples. Peptides are selected by a computational pipeline that identifies mutations from tumor/normal exome sequencing and ranks mutant sequences by a combination of predicted Class I MHC affinity and abundance estimated from tumor RNA. The personalized genomic vaccine (PGV) pipeline is modular and consists of independently usable tools and software libraries. We hope that the functionality of these tools may extend beyond the specifics of the PGV-001 trial and enable other research groups in their own neoantigen investigations
Mobility–Lifetime Products in MAPbI<sub>3</sub> Films
Photovoltaic
solar cells operate under steady-state conditions
that are established during the charge carrier excitation and recombination.
However, to date no model of the steady-state recombination scenario
in halide perovskites has been proposed. In this Letter we present
such a model that is based on a single type of recombination center,
which is deduced from our measurements of the illumination intensity
dependence of the photoconductivity and the ambipolar diffusion length
in those materials. The relation between the present results and those
from time-resolved measurements, such as photoluminescence that are
commonly reported in the literature, is discussed
What Is the Mechanism of MAPbI<sub>3</sub> p‑Doping by I<sub>2</sub>? Insights from Optoelectronic Properties
Obtaining insight
into, and ultimately control over, electronic
doping of halide perovskites may improve tuning of their remarkable
optoelectronic properties, reflected in what appear to be low defect
densities and as expressed in various charge transport and optical
parameters. Doping is important for charge transport because it determines
the electrical field within the semiconducting photoabsorber, which
strongly affects collection efficiency of photogenerated charges.
Here we report on intrinsic doping of methylammonium lead tri-iodide,
MAPbI<sub>3</sub>, as thin films of the types used for solar cells
and LEDs, by I<sub>2</sub> vapor at a level that does not affect the
optical absorption and leads to a small (<20 meV, ∼9 nm)
red shift in the photoluminescence peak. This I<sub>2</sub> vapor
treatment makes the films 10× more electronically conductive
in the dark. We show that this change is due to p-type doping because
we find their work function to increase by 150 mV with respect to
the ionization energy (valence band maximum), which does not change
upon I<sub>2</sub> exposure. The majority carrier (hole) diffusion
length increases upon doping, making the material less ambipolar.
Our results are well-explained by I<sub>2</sub> exposure decreasing
the density of donor defects, likely iodide vacancies (V<sub>I</sub>) or defect complexes, containing V<sub>I</sub>. Invoking iodide
interstitials, which are acceptor defects, seems less likely based
on calculations of the formation energies of such defects and is in
agreement with a recent report on pressed pellets