Hsu, Julia W. P.
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Julia Hsu is a Professor in the Department of Materials Science and Engineering. She also holds the Texas Instruments Distinguished Chair in Nanoelectronics. Her research focuses on nanoscale materials physics. She has done extensive work on local characterization of electronic and photonic materials and devices using scanning probe techniques. The material systems she has studied include metals and alloys, group IV, III-V and II-VI semiconductors, and oxides. She is most interested in the relationship between microscopic organization and macroscopic properties of nanocomposites, including controlling assembly of inorganic nanomaterials in organic matrices and understanding electronic properties at the organic-inorganic interface, with applications towards energy applications, such as nanostructured solar cells. The research projects will include improving organic photovoltaics, nanomaterial synthesis, electrical and electronic studies of nanocomposites and heterojunctions, and nanofabrication.
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Recent Submissions
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Superior Low-Temperature NO Catalytic Performance of PrMn₂O₅ over SmMn₂O₅ Mullite-Type Catalysts
(Royal Society of Chemistry, 2019)By studying their surface chemistry, metal-oxygen bond strength, and critical energy barrier heights, we elucidate the differences in the NO oxidation catalytic performance of PrMn₂O₅ and SmMn₂O₅ mullite-type oxides. The ... -
Probing Defect States in Organic Polymers and Bulk Heterojunctions Using Surface Photovoltage Spectroscopy
(American Chemical Society, 2019-04-10)We performed frequency-modulated (AC) and steady-state (DC) surface photovoltage spectroscopy (SPS) measurements on a bilayer structure consisting of an organic semiconductor (P3HT, P3HT:PC₆₁ BM, or PFBT₂Se₂Th:PC₇₁ BM) on ... -
Solution-Processed Oxide Thin Film Transistors on Shape Memory Polymer Enabled by Photochemical Self-Patterning
Solution-processed metal oxide electronics on flexible substrates can enable applications from military to health care. Due to limited thermal budgets and mismatched coefficients of thermal expansion between oxides and ... -
Minimizing Performance Degradation Induced by Interfacial Recombination in Perovskite Solar Cells through Tailoring of the Transport Layer Electronic Properties
The performance of hybrid organic-inorganic metal halide perovskite solar cells is investigated using one-dimensional drift-diffusion device simulations. We study the effects of interfacial defect density, doping concentration, ... -
Nucleation and Growth of WSe₂: Enabling Large Grain Transition Metal Dichalcogenides
(IOP Publishing Ltd, 2017-09-22)The limited grain size (< 200 nm) for transition metal dichalcogenides (TMDs) grown by molecular beam epitaxy (MBE) reported in the literature thus far is unsuitable for high-performance device applications. In this work, ... -
Understanding the Source of Dielectric Loss in Titania/Polypropylene Nanocomposites up to 220 GHz
(2017-02-20)Nanocomposites are a promising new dielectric material for on-chip and chip-to-chip waveguides that operate at millimeter (mm)-wave frequencies because of their higher relative permittivity compared to neat polymers and ... -
Sub-10 NM Copper Chromium Oxide Nanocrystals as a Solution Processed P-Type Hole Transport Layer for Organic Photovoltaics
We report the synthesis of CuCrO₂ nanocrystals, a p-type transparent conducting oxide, and their application as an efficient hole transport layer (HTL) for organic photovoltaic (OPV) devices. A nanometer-sized mixture of ... -
Organic-Inorganic Hybrid Semiconductor Thin Films Deposited Using Molecular-Atomic Layer Deposition (MALD)
Molecular-atomic layer deposition (MALD) is employed to fabricate hydroquinone (HQ)/diethyl zinc (DEZ) organic-inorganic hybrid semiconductor thin films with accurate thickness control, sharp interfaces, and low deposition ... -
Charge Collection in Bulk Heterojunction Organic Photovoltaic Devices: An Impedance Spectroscopy Study
Through thickness and applied bias variation, charge collection in poly(3-hexylthiophene):[6,6]-phenyl C61-butyric acid methyl ester (P3HT:PCBM) bulk heterojunction organic photovoltaic (OPV) devices was investigated with ... -
Surface Photovoltage Characterization of Organic Photovoltaic Devices
Surface photovoltage response in bulk heterojunction organic solar cells is determined using a Kelvin probe with variable illumination intensity and wavelength. The effect of device architecture, carrier transport layers, ... -
Intensity and Wavelength Dependence of Bimolecular Recombination in P3HT:PCBM Solar Cells: A White-Light Biased External Quantum Efficiency Study
Bimolecular recombination is often a major photogenerated charge carrier loss mechanism in organic photovoltaic (OPV) devices, resulting in lower fill factor (FF) compared to inorganic devices. The recombination parameter ... -
In Situ Chemical Oxidation of Ultrasmall MoOx Nanoparticles in Suspensions
(2012-07-23)Nanoparticle suspensions represent a promising route toward low cost, large area solution deposition of functional thin films for applications in energy conversion, flexible electronics, and sensors. However, parameters ...