Terry E. Haas

Bio: Terry E. Haas is an academic researcher from Tufts University. The author has contributed to research in topics: Electrochromism & Thin film. The author has an hindex of 25, co-authored 69 publications receiving 1874 citations. Previous affiliations of Terry E. Haas include Harvard University.

A Molecular Orbital Treatment of the Bonding in Certain Metal Atom Clusters

Abstract: The structures of the STAM/sub 6/X/sub 8/!/sup 4+/, M=Mo, W(?), STAM/sub 6/Cl/sub 12//sup 2+/, M = Nb, Ta, and STAM/sub 3/X/sub 12/!/sup 3-/, M= Re, species, which contain clusters of heavy transition metal atoms are compared; and the occurrence of approximately square MX/sub4/ units is noted as a common feature. The metal-metal bonding within the clusters is treated by a simple molecular orbital method, and it is shown that in this way all the general aspects of the electronic structures can be straightforwardly accounted for. Clues provided as to other possible metal ion cluster compounds are discussed. (auth)

Rechargeable thin film battery and method for making the same

Abstract: A rechargeable, stackable, thin film, solid-state lithium electrochemical cell, thin film lithium battery and method for making the same is disclosed. The cell and battery provide for a variety configurations, voltage and current capacities. An innovative low temperature ion beam assisted deposition method for fabricating thin film, solid-state anodes, cathodes and electrolytes is disclosed wherein a source of energetic ions and evaporants combine to form thin film cell components having preferred crystallinity, structure and orientation. The disclosed batteries are particularly useful as power sources for portable electronic devices and electric vehicle applications where high energy density, high reversible charge capacity, high discharge current and long battery lifetimes are required.

Electrochromic window with high reflectivity modulation

Abstract: A multi-layered, active, thin film, solid-state electrochromic device having a high reflectivity in the near infrared in a colored state, a high reflectivity and transmissivity modulation when switching between colored and bleached states, a low absorptivity in the near infrared, and fast switching times, and methods for its manufacture and switching are provided. In one embodiment, a multi-layered device comprising a first indium tin oxide transparent electronic conductor, a transparent ion blocking layer, a tungsten oxide electrochromic anode, a lithium ion conducting-electrically resistive electrolyte, a complimentary lithium mixed metal oxide electrochromic cathode, a transparent ohmic contact layer, a second indium oxide transparent electronic conductor, and a silicon nitride encapsulant is provided. Through elimination of optional intermediate layers, simplified device designs are provided as alternative embodiments. Typical colored-state reflectivity of the multi-layered device is greater than 50% in the near infrared, bleached-state reflectivity is less than 40% in the visible, bleached-state transmissivity is greater than 60% in the near infrared and greater than 40% in the visible, and spectral absorbance is less than 50% in the range from 0.65-2.5 μm.

Methods for manufacturing solid state ionic devices

Abstract: A multilayer, thin film solid state ionic device usable as an electrochromic window and/or as a rechargeable battery and a method for its manufacture. In one embodiment, the device comprises a transparent substrate and a thin film, five layered coating, the coating being deposited onto the substrate. The device is made by depositing a first layer of indium tin oxide onto the substrate, depositing a second layer of tungsten trioxide onto the first layer, inserting a quantity of lithium ions into the second layer so as to form a lithium-enriched second layer, depositing a third layer of lithium niobate onto the lithium-enriched second layer, sputter depositing a fourth layer of LiCoO 2 onto the third layer, whereby the fourth layer is lithium-deficient, applying, in the presence of a plasma, a sufficiently large positive electrical potential to the second layer so as to cause virtually all of the lithium ions inserted thereinto to be expelled therefrom, whereby a quantity of lithium ions are added to the fourth layer to ameliorate its lithium deficiency and whereby any lithium ions expelled from the second layer but not needed to cure the deficiency of lithium ions in the fourth layer are expelled into the plasma, and then depositing a fifth layer made of indium oxide onto said fourth layer.

Mixed Valence Chemistry-A Survey and Classification

Abstract: Publisher Summary This review is concerned with the neglected class of inorganic compounds, which contain ions of the same element in two different formal states of oxidation. Although the number of references cited in our review show that many individual examples of this class have been studied, yet they have very rarely been treated as a class, and there has never before, to our knowledge, been a systematic attempt to classify their properties in terms of their electronic and molecular structures. In the past, systems containing an element in two different states of oxidation have gone by various names, the terms “mixed valence,” nonintegral valence,” “mixed oxidation,” “oscillating valency,” and “controlled valency” being used interchangeably. Actually, none of these is completely accurate or all-embracing, but in our hope to avoid the introduction of yet another definition, we have somewhat arbitrarily adopted the phrase “mixed valence” for the description of these systems. The concept of resonance among various valence bond structures is one of the cornerstones of modern organic chemistry.

Evaporated Sn‐doped In2O3 films: Basic optical properties and applications to energy‐efficient windows

Abstract: We review work on In2O3:Sn films prepared by reactive e‐beam evaporation of In2O3 with up to 9 mol % SnO2 onto heated glass. These films have excellent spectrally selective properties when the deposition rate is ∼0.2 nm/s, the substrate temperature is ≳150 °C, and the oxygen pressure is ∼5×10−4 Torr. Optimized coatings have crystallite dimensions ≳50 nm and a C‐type rare‐earth oxide structure. We cover electromagnetic properties as recorded by spectrophotometry in the 0.2–50‐μm range, by X‐band microwave reflectance, and by dc electrical measurements. Hall‐effect data are included. An increase of the Sn content is shown to have several important effects: the semiconductor band gap is shifted towards the ultraviolet, the luminous transmittance remains high, the infrared reflectance increases to a high value beyond a certain wavelength which shifts towards the visible, phonon‐induced infrared absorption bands vanish, the microwave reflectance goes up, and the dc resisitivity drops to ∼2×10−4 Ω cm. The corre...

Graphene based new energy materials

Abstract: Graphene, a one-atom layer of graphite, possesses a unique two-dimensional (2D) structure, high conductivity and charge carrier mobility, huge specific surface area, high transparency and great mechanical strength. Thus, it is expected to be an ideal material for energy storage and conversion. During the past several years, a variety of graphene based materials (GBMs) have been successfully prepared and applied in supercapacitors, lithium ion batteries, water splitting, electrocatalysts for fuel cells, and solar cells. In this review, we will summarize the recent advances in the synthesis and applications of GBMs in these energy related systems. The challenges and prospects of graphene based new energy materials are also discussed.