@article{kim_atanasov_lemaire_lee_parsons_2015, title={Platinum-Free Cathode for Dye-Sensitized Solar Cells Using Poly(3,4-ethylenedioxythiophene) (PEDOT) Formed via Oxidative Molecular Layer Deposition}, volume={7}, ISSN={["1944-8244"]}, url={http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000350193000002&KeyUID=WOS:000350193000002}, DOI={10.1021/am5084418}, abstractNote={Thin ∼ 20 nm conformal poly(3,4-ehylenedioxythiophene) (PEDOT) films are incorporated in highly conductive mesoporous indium tin oxide (m-ITO) by oxidative molecular layer deposition (oMLD). These three-dimensional catalytic/conductive networks are successfully employed as Pt-free cathodes for dye-sensitized solar cells (DSSCs) with open circuit voltage equivalent to Pt cathode devices. Thin and conformal PEDOT films on m-ITO by oMLD create high surface area and efficient electron transport paths to promote productive reduction reaction on the PEDOT film. Because of these two synergetic effects, PEDOT-coated m-ITO by oMLD shows power conversion efficiency, 7.18%, comparable to 7.26% of Pt, and higher than that of planar PEDOT coatings, which is 4.85%. Thus, PEDOT-coated m-ITO is an exceptional opportunity to compete with Pt catalysts for low-cost energy conversion devices.}, number={7}, journal={ACS APPLIED MATERIALS & INTERFACES}, author={Kim, Do Han and Atanasov, Sarah E. and Lemaire, Paul and Lee, Kyoungmi and Parsons, Gregory N.}, year={2015}, month={Feb}, pages={3866–3870} }
 @article{lee_kim_parsons_2014, title={Free-Floating Synthetic Nanosheets by Atomic Layer Deposition}, volume={6}, ISSN={["1944-8252"]}, url={http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000339472100023&KeyUID=WOS:000339472100023}, DOI={10.1021/am502850p}, abstractNote={Two-dimensional (2D) nanosheets with distinctive properties are often fabricated by exfoliation, hydrothermal synthesis, or vapor-phase reaction. While these approaches are useful to generate nanosheets, we show that free-floating 2D metal oxide flakes with nanometer-scale thickness can also be formed by atomic layer deposition (ALD), where the ALD process allows the thickness and composition to be precisely tuned. In this work, we describe in detail the ALD nanosheet fabrication process and demonstrate how the choice of the sacrificial substrate affects the subsequent ALD processing and the resulting nanosheet thickness and surface structure. In addition, we introduce the fabrication of organic/inorganic bilayer nanosheets with unique potential applications.}, number={14}, journal={ACS APPLIED MATERIALS & INTERFACES}, author={Lee, Kyoungmi and Kim, Do Han and Parsons, Gregory N.}, year={2014}, month={Jul}, pages={10981–10985} }
 @article{lee_losego_kim_parsons_2014, title={High performance photocatalytic metal oxide synthetic bi-component nanosheets formed by atomic layer deposition}, volume={1}, ISSN={["2051-6355"]}, url={http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000348204200005&KeyUID=WOS:000348204200005}, DOI={10.1039/c4mh00012a}, abstractNote={Synthetic nanosheets that are ultrathin variants of bulk materials have been acquired using atomic layer deposition (ALD) on dissolvable substrates with a control over layer dimension including single and bilayered “Janus nanosheet” structures. TiO2, ZnO, Al2O3 and TiO2/ZnO nanosheets function as dispersible photocatalysts in aqueous media showing 3× synergistic rate enhancement for bilayered nanosheets.}, number={4}, journal={MATERIALS HORIZONS}, author={Lee, Kyoungmi and Losego, Mark D. and Kim, Do Han and Parsons, Gregory N.}, year={2014}, month={Jul}, pages={419–423} }
 @article{kim_losego_hanson_alibabaei_lee_meyer_parsons_2014, title={Stabilizing chromophore binding on TiO2 for long-term stability of dye-sensitized solar cells using multicomponent atomic layer deposition}, volume={16}, ISSN={["1463-9084"]}, url={http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000334602900050&KeyUID=WOS:000334602900050}, DOI={10.1039/c4cp01130a}, abstractNote={Dye sensitized solar cells (DSSCs) are coated with subnanometer oxide coatings to prevent device degradation in ambient humidity and high temperatures.}, number={18}, journal={PHYSICAL CHEMISTRY CHEMICAL PHYSICS}, author={Kim, Do Han and Losego, Mark D. and Hanson, Kenneth and Alibabaei, Leila and Lee, Kyoungmi and Meyer, Thomas J. and Parsons, Gregory N.}, year={2014}, pages={8615–8622} }
 @article{kim_woodroof_lee_parsons_2013, title={Atomic Layer Deposition of High Performance Ultrathin TiO2 Blocking Layers for Dye-Sensitized Solar Cells}, volume={6}, ISSN={["1864-564X"]}, url={http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000319828000011&KeyUID=WOS:000319828000011}, DOI={10.1002/cssc.201300067}, abstractNote={Abstract}, number={6}, journal={CHEMSUSCHEM}, author={Kim, Do Han and Woodroof, Mariah and Lee, Kyoungmi and Parsons, Gregory N.}, year={2013}, month={Jun}, pages={1014–1020} }
 @article{peng_kalanyan_hoertz_miller_kim_hanson_alibabaei_liu_meyer_parsons_et al._2013, title={Solution-Processed, Antimony-Doped Tin Oxide Colloid Films Enable High-Performance TiO2 Photoanodes for Water Splitting}, volume={13}, ISSN={["1530-6992"]}, url={http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000317549300020&KeyUID=WOS:000317549300020}, DOI={10.1021/nl3045525}, abstractNote={Photoelectrochemical (PEC) water splitting and solar fuels hold great promise for harvesting solar energy. TiO2-based photoelectrodes for water splitting have been intensively investigated since 1972. However, solar-to-fuel conversion efficiencies of TiO2 photoelectrodes are still far lower than theoretical values. This is partially due to the dilemma of a short minority carrier diffusion length, and long optical penetration depth, as well as inefficient electron collection. We report here the synthesis of TiO2 PEC electrodes by coating solution-processed antimony-doped tin oxide nanoparticle films (nanoATO) on FTO glass with TiO2 through atomic layer deposition. The conductive, porous nanoATO film-supported TiO2 electrodes, yielded a highest photocurrent density of 0.58 mA/cm(2) under AM 1.5G simulated sunlight of 100 mW/cm(2). This is approximately 3× the maximum photocurrent density of planar TiO2 PEC electrodes on FTO glass. The enhancement is ascribed to the conductive interconnected porous nanoATO film, which decouples the dimensions for light absorption and charge carrier diffusion while maintaining efficient electron collection. Transient photocurrent measurements showed that nanoATO films reduce charge recombination by accelerating transport of photoelectrons through the less defined conductive porous nanoATO network. Owing to the large band gap, scalable solution processed porous nanoATO films are promising as a framework to replace other conductive scaffolds for PEC electrodes.}, number={4}, journal={NANO LETTERS}, author={Peng, Qing and Kalanyan, Berc and Hoertz, Paul G. and Miller, Andrew and Kim, Do Han and Hanson, Kenneth and Alibabaei, Leila and Liu, Jie and Meyer, Thomas J. and Parsons, Gregory N. and et al.}, year={2013}, month={Apr}, pages={1481–1488} }
 @article{lee_jur_kim_parsons_2012, title={Mechanisms for hydrophilic/hydrophobic wetting transitions on cellulose cotton fibers coated using Al2O3 atomic layer deposition}, volume={30}, ISSN={["0734-2101"]}, url={http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000298992800063&KeyUID=WOS:000298992800063}, DOI={10.1116/1.3671942}, abstractNote={This report explores reactions that proceed during the first few cycles of inorganic film atomic layer deposition (ALD) on natural cellulose cotton fibers, and how surface reactions can explain the previously observed transitions in surface wetting upon ALD on cotton fibers. Atomic layer deposition of aluminum oxide and zinc oxide onto natural cotton cellulose produces a transition from hydrophilic to hydrophobic, then from hydrophobic back to hydrophilic, and we describe here the main factors that bring about. Interestingly, we show that air exposure and related adventitious carbon adsorption also affects the subsequent reactions and wetting properties obtained after subsequent ALD cycles. X-ray photoelectron spectroscopy and in situ Fourier transform infrared spectroscopy data indicate Al-(O-C-)3 bonding units form when trimethylaluminum interacts with surface –OH units during the first precursor doses, producing a hydrophobic finish on the cotton that remains for only a few ALD cycles. Also, field-emission scanning electron microscopy results show that some surface roughening may occur in the first few ALD cycles, and the roughening of the hydrophobic-finished surface can also promote an increase in measured hydrophobicity.}, number={1}, journal={JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A}, author={Lee, Kyoungmi and Jur, Jesse S. and Kim, Do Han and Parsons, Gregory N.}, year={2012}, month={Jan} }
 @article{gong_kim_parsons_2012, title={Mesoporous Metal Oxides by Vapor Infiltration and Atomic Layer Deposition on Ordered Surfactant Polymer Films}, volume={28}, ISSN={["0743-7463"]}, url={http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000307479000029&KeyUID=WOS:000307479000029}, DOI={10.1021/la302027b}, abstractNote={Catalysis, chemical separations, and energy conversion devices often depend on well-defined mesoporous materials as supports or active component elements. Herein, we show that ordered assembled organic surfactant films can directly template porous inorganic solids with surface area exceeding 1000 m(2)/g by infusing the polymers with reactive inorganic vapors, followed by anneal. The specific surface area, pore size, chemical composition, and overall shape of the product material are tuned by choice of the polymer and precursor materials as well as the influsion and postinfusion treatment conditions. X-ray diffraction, infrared spectroscopy, and electron microscopy show that vapor infusion changes both the physical and chemical structure of the starting ordered polymer films, consistent with quantified trends in specific surface area and pore size distribution measured by nitrogen adsorption after film annealing. This method yields porous TiO(2) films, for example, that function as an anode layer in a dye-sensitized solar cell.}, number={32}, journal={LANGMUIR}, author={Gong, Bo and Kim, Do Han and Parsons, Gregory N.}, year={2012}, month={Aug}, pages={11915–11922} }
 @article{kim_koo_jur_woodroof_kalanyan_lee_devine_parsons_2012, title={Stable anatase TiO2 coating on quartz fibers by atomic layer deposition for photoactive light-scattering in dye-sensitized solar cells}, volume={4}, ISSN={["2040-3372"]}, url={http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000306324000056&KeyUID=WOS:000306324000056}, DOI={10.1039/c2nr30939d}, abstractNote={Quartz fibers provide a unique high surface-area substrate suitable for conformal coating using atomic layer deposition (ALD), and are compatible with high temperature annealing. This paper shows that the quartz fiber composition stabilizes ALD TiO(2) in the anatase phase through TiO(2)-SiO(2) interface formation, even after annealing at 1050 °C. When integrated into a dye-sensitized solar cell, the TiO(2)-coated quartz fiber mat improves light scattering performance. Results also confirm that annealing at high temperature is necessary for better photoactivity of ALD TiO(2), which highlights the significance of quartz fibers as a substrate. The ALD TiO(2) coating on quartz fibers also boosts dye adsorption and photocurrent response, pushing the overall efficiency of the dye-cells from 6.5 to 7.4%. The mechanisms for improved cell performance are confirmed using wavelength-dependent incident photon to current efficiency and diffuse light scattering results. The combination of ALD and thermal processing on quartz fibers may enable other device structures for energy conversion and catalytic reaction applications.}, number={15}, journal={NANOSCALE}, author={Kim, Do Han and Koo, Hyung-Jun and Jur, Jesse S. and Woodroof, Mariah and Kalanyan, Berc and Lee, Kyoungmi and Devine, Christina K. and Parsons, Gregory N.}, year={2012}, pages={4731–4738} }
 @article{kim_kim_kim_lee_parsons_park_2011, title={SiNx charge-trap nonvolatile memory based on ZnO thin-film transistors}, volume={99}, ISSN={["0003-6951"]}, url={http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000295034400043&KeyUID=WOS:000295034400043}, DOI={10.1063/1.3640221}, abstractNote={We have demonstrated the fabrication and application of a nonvolatile thin-film transistor memory with SiNx charge traps using a ZnO thin film as the active channel layer. The thin film of ZnO was deposited using an atomic-layer deposition process and was subsequently post-annealed in an O2-filled atmosphere. X-ray diffraction and x-ray photoemission results indicated that the O2 annealing process was effective for the crystallinity and stoichiometry of the ZnO films. A saturation field-effect mobility of 6 cm2/Vs, on/off ratio of ≈105, subthreshold slope of 0.7 V/decade, and threshold voltage of −5 V were obtained in transistor operations. Threshold-voltage shift measurements performed for various stress voltages and time durations revealed that these devices had a large memory window of 5.4 V and a long retention time (>10 years) in nonvolatile memory operations.}, number={11}, journal={APPLIED PHYSICS LETTERS}, author={Kim, Eunkyeom and Kim, Youngill and Kim, Do Han and Lee, Kyoungmi and Parsons, Gregory N. and Park, Kyoungwan}, year={2011}, month={Sep} }