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Research Output 1900 2019

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2019

An approach to optimize pre-annealing aging and anneal conditions to improve photovoltaic performance of perovskite solar cells

Sanni, D. M., Chen, Y., Yerramilli, A. S., Ntsoenzok, E., Asare, J., Adeniji, S. A., Oyelade, O. V., Fashina, A. A. & Alford, T., Mar 1 2019, In : Materials for Renewable and Sustainable Energy. 8, 1, 3.

Research output: Contribution to journalArticle

Aging of materials
Annealing
Perovskite
Lead
Temperature

Effect of excessive Pb on the stability and performance of Pb-halide perovskite solar cells against photo-induced degradation

Yerramilli, A. S., Chen, Y. & Alford, T., Mar 1 2019, In : MRS Communications. 9, 1, p. 189-193 5 p.

Research output: Contribution to journalArticle

Degradation
ITO glass
Passivation
Grain boundaries
Acetates

Enhanced power conversion efficiency and preferential orientation of the MAPbI3 perovskite solar cells by introduction of urea as additive

Li, Y., Li, L., Yerramilli, A. S., Chen, Y., Fang, D., Shen, Y. & Alford, T., Oct 1 2019, In : Organic Electronics: physics, materials, applications. 73, p. 130-136 7 p.

Research output: Contribution to journalArticle

ureas
Urea
Conversion efficiency
Perovskite
solar cells

Improved performance of inverted perovskite solar cells due to the incorporation of zirconium acetylacetonate buffer layer

Yerramilli, A. S., Chen, Y., Knight, A., Gogoi, B., Li, L., Song, Y., Shen, Y. & Alford, T., Sep 15 2019, In : Solar Energy Materials and Solar Cells. 200, 109927.

Research output: Contribution to journalArticle

Buffer layers
Zirconium
Dark currents
Conversion efficiency
Photoluminescence
1 Citation (Scopus)

Introduction of nitrogen gas flow and precursor aging process to improve the efficiency of the lead acetate derived CH3NH3PbI3 perovskite solar cells

Chen, Y., Li, L., Yerramilli, A. S., Qu, W., Song, Y., Li, N., Shen, Y. & Alford, T., Feb 1 2019, In : Solar Energy Materials and Solar Cells. 190, p. 49-56 8 p.

Research output: Contribution to journalArticle

Flow of gases
Nitrogen
Lead
Aging of materials
Phase composition
2018
1 Citation (Scopus)

Control of the Nucleation and Growth of the Lead Acetate Solution Derived CH 3 NH 3 PbI 3 Films Leads to Enhanced Power Conversion Efficiency

Chen, Y., Yerramilli, A. S., Li, L., Qu, W., Shen, Y., Song, Y. & Alford, T., Jun 25 2018, In : ACS Applied Energy Materials. 1, 6, p. 2898-2906 9 p.

Research output: Contribution to journalArticle

Conversion efficiency
Nucleation
Lead
Spin coating
Solar cells

Development of low-fluorine solution route and UV photolysis process for YBa2Cu3O7-x coated conductors

Chen, Y., Qu, W., Bian, W., Li, L., Yerramilli, A. S., Li, N., Song, Y., Wu, H., Wang, A., Theodore, N. D. & Alford, T., Jan 1 2018, (Accepted/In press) In : MRS Communications.

Research output: Contribution to journalArticle

Fluorine
Photolysis
Trifluoroacetic Acid
Superconducting films
Steam
14 Citations (Scopus)

Effect of excessive Pb content in the precursor solutions on the properties of the lead acetate derived CH3NH3PbI3 perovskite solar cells

Chen, Y., Yerramilli, A., Shen, Y., Zhao, Z. & Alford, T., Jan 1 2018, In : Solar Energy Materials and Solar Cells. 174, p. 478-484 7 p.

Research output: Contribution to journalArticle

Lead
Conversion efficiency
Perovskite
Perovskite solar cells
lead acetate
3 Citations (Scopus)

Fabrication of PZT/CuO composite films and their photovoltaic properties

Song, Y., Li, L., Chen, Y., Li, F., Qu, W., Wu, H., Yerramilli, A. S., Alford, T. & Zheng, H., Jun 23 2018, (Accepted/In press) In : Journal of Sol-Gel Science and Technology. p. 1-7 7 p.

Research output: Contribution to journalArticle

Composite films
Photocurrents
Fabrication
fabrication
composite materials
1 Citation (Scopus)

Impact of excess lead on the stability and photo-induced degradation of lead halide perovskite solar cells

Yerramilli, A. S., Chen, Y., Sanni, D., Asare, J., Theodore, N. D. & Alford, T., Aug 1 2018, In : Organic Electronics: physics, materials, applications. 59, p. 107-112 6 p.

Research output: Contribution to journalArticle

halides
Lead
solar cells
degradation
Degradation

Mathematical model of the effects of government intervention and rehabilitation of prostitution

Lanz, A., White, Z. & Alford, T., Mar 9 2018, (Accepted/In press) In : International Journal of Biomathematics.

Research output: Contribution to journalArticle

Rehabilitation
Patient rehabilitation
Mathematical Model
Mathematical models
Basic Reproductive number
2017

A Comparative Study on TID Influenced Lateral Diffusion of Group 11 Metals into GexS1-x and GexSe1-x Systems: A Flexible Radiation Sensor Development Perspective

Mahmud, A., Gonzalez Velo, Y., Barnaby, H., Kozicki, M., Mitkova, M., Holbert, K., Goryll, M., Alford, T., Taggart, J. L. & Chen, W., Aug 1 2017, In : IEEE Transactions on Nuclear Science. 64, 8, p. 2292-2299 8 p., 7882640.

Research output: Contribution to journalArticle

traveling ionospheric disturbances
selenides
Radiation
Electrodes
electrodes

Comparison of scanning laser annealing and microwave annealing for As+ implanted Si

Zhao, Z., Hilman, J., Oropeza, M., Nian, Q. & Alford, T., Jan 1 2017, In : Journal of Vacuum Science and Technology B: Nanotechnology and Microelectronics. 35, 1, 011202.

Research output: Contribution to journalArticle

laser annealing
Microwaves
Annealing
Scanning
microwaves
6 Citations (Scopus)

Resistive Switching Characteristics of Flexible TiO₂ Thin Film Fabricated by Deep Ultraviolet Photochemical Solution Method

Chen, Y., Li, L., Yin, X., Yerramilli, A., Shen, Y., Song, Y., Bian, W., Li, N., Zhao, Z., Qu, W., Theodore, N. D. & Alford, T., Sep 23 2017, (Accepted/In press) In : IEEE Electron Device Letters.

Research output: Contribution to journalArticle

Thin films
Polyethylene Terephthalates
Tin oxides
Polyethylene terephthalates
Indium
3 Citations (Scopus)
Indium
Tin oxides
Anodes
Electrodes
Styrene
2016
4 Citations (Scopus)

A percolative approach to investigate electromigration failure in printed Ag structures

Zhao, Z., Mamidanna, A., Lefky, C., Hildreth, O. & Alford, T., Sep 28 2016, In : Journal of Applied Physics. 120, 12, 125104.

Research output: Contribution to journalArticle

electromigration
inks
silver
microelectronics
life (durability)
3 Citations (Scopus)

Flexible Ag-ChG Radiation Sensors: Limit of Detection and Dynamic Range Optimization Through Physical Design Tuning

Mahmud, A., Gonzalez Velo, Y., Saremi, M., Barnaby, H., Kozicki, M., Holbert, K., Mitkova, M., Alford, T., Goryll, M., Yu, W., Mahalanabis, D., Chen, W., Chamele, N. & Taggart, J., Jul 18 2016, (Accepted/In press) In : IEEE Transactions on Nuclear Science.

Research output: Contribution to journalArticle

dynamic range
Tuning
tuning
Radiation
optimization
4 Citations (Scopus)

Measurement of InAsBi mole fraction and InBi lattice constant using Rutherford backscattering spectrometry and X-ray diffraction

Shalindar, A. J., Webster, P. T., Wilkens, B. J., Alford, T. & Johnson, S., Oct 14 2016, In : Journal of Applied Physics. 120, 14, 145704.

Research output: Contribution to journalArticle

backscattering
diffraction
spectroscopy
x rays
sidebands
15 Citations (Scopus)
Electrodes
Indium
Tin oxides
Deposition rates
Conversion efficiency
2015
15 Citations (Scopus)

Advances in 2D/3D printing of functional nanomaterials and their applications

Choi, J. Y., Das, S., Theodore, N. D., Kim, I., Honsberg, C., Choi, H. W. & Alford, T., 2015, In : ECS Journal of Solid State Science and Technology. 4, 4, p. P3001-P3009

Research output: Contribution to journalArticle

Nanostructured materials
Printing
Functional materials
Ointments
Ink
9 Citations (Scopus)

Aging effect of a molecularly imprinted polymer on a quartz tuning fork sensor for detection of volatile organic compounds

Deng, Y., Chen, C., Qin, X., Xian, X., Alford, T., Choi, H. W., Tsow, F. & Forzani, E., 2015, In : Sensors and Actuators, B: Chemical. 211, p. 25-32 8 p.

Research output: Contribution to journalArticle

Volatile Organic Compounds
forks
Quartz
volatile organic compounds
Volatile organic compounds

A Method for Efficient Transmittance Spectrum Prediction of Transparent Composite Electrodes

Zhao, Z., Dhar, A. & Alford, T., Jul 1 2015, In : JOM. 67, 7, p. 1612-1616 5 p.

Research output: Contribution to journalArticle

Metals
Electrodes
Composite materials
Oxides
Indium
3 Citations (Scopus)

Carrier recombination lifetime measurement in silicon epitaxial layers using optically excited MOS capacitor technique

Elhami Khorasani, A., Schroder, D. K. & Alford, T., May 1 2015, In : IEEE Transactions on Electron Devices. 62, 5, p. 1553-1560 8 p., 7067362.

Research output: Contribution to journalArticle

MOS capacitors
Epitaxial layers
Silicon
Solid state devices
MOS devices
3 Citations (Scopus)

Computational modeling of optical properties in aluminum nanolayers inserted in ZnO for solar cell electrodes

Rwenyagila, E. R., Agyei-Tuffour, B., Onogu, K. O., Akin-Ojo, O., Zebaze Kana, M. G., Alford, T. & Soboyejo, W. O., 2015, In : Optics Letters. 40, 16, p. 3914-3917 4 p.

Research output: Contribution to journalArticle

solar cells
aluminum
optical properties
electrodes
transmittance
1 Citation (Scopus)

Controlled Microwave Processing of IGZO Thin Films for Improved Optical and Electrical Properties

Dhar, A. & Alford, T., Jul 1 2015, In : JOM. 67, 7, p. 1624-1628 5 p.

Research output: Contribution to journalArticle

Zinc Oxide
Gallium
Indium
Zinc oxide
Oxide films
4 Citations (Scopus)

Effect of Different Substrates on the Wettability and Electrical Properties of Au Thin Films Deposited by Sputtering

Dhar, A., Zhao, Z. & Alford, T., Mar 10 2015, In : JOM. 67, 4, p. 845-848 4 p.

Research output: Contribution to journalArticle

Sputtering
Wetting
Electric properties
Thin films
Substrates
7 Citations (Scopus)
Gold
Multilayers
Electric properties
Optical properties
Annealing
13 Citations (Scopus)

Fabrication of periodic silicon nanopillars in a two-dimensional hexagonal array with enhanced control on structural dimension and period

Choi, J. Y., Alford, T. & Honsberg, C., Mar 17 2015, In : Langmuir. 31, 13, p. 4018-4023 6 p.

Research output: Contribution to journalArticle

Nanospheres
Silicon
Silicon Dioxide
Metals
Silica
10 Citations (Scopus)
Zinc Oxide
Yttrium
Zinc oxide
Doping (additives)
Annealing
33 Citations (Scopus)

P3HT: PC61BM based solar cells employing solution processed copper iodide as the hole transport layer

Das, S., Choi, J. Y. & Alford, T., 2015, In : Solar Energy Materials and Solar Cells. 133, p. 255-259 5 p.

Research output: Contribution to journalArticle

Iodides
Copper
Solar cells
Butyric acid
X ray diffraction analysis
22 Citations (Scopus)

Photocurrent enhancements of organic solar cells by altering dewetting of plasmonic Ag nanoparticles

Fleetham, T., Choi, J. Y., Choi, H. W., Alford, T., Jeong, D. S., Lee, T. S., Lee, W. S., Lee, K. S., Li, J. & Kim, I., Sep 21 2015, In : Scientific Reports. 5, 14250.

Research output: Contribution to journalArticle

drying
photocurrents
solar cells
nanoparticles
ITO (semiconductors)
4 Citations (Scopus)

Prediction of transmittance spectra for transparent composite electrodes with ultra-thin metal layers

Zhao, Z., Khorasani, A. E., Theodore, N. D., Dhar, A. & Alford, T., Nov 28 2015, In : Journal of Applied Physics. 118, 20, 205304.

Research output: Contribution to journalArticle

transmittance
composite materials
electrodes
predictions
metals
2014
3 Citations (Scopus)

A fast I-V screening measurement for tddb assessment of ultra-thick inter-metal dielectrics

Khorasani, A. E., Griswold, M. & Alford, T., Jan 2014, In : IEEE Electron Device Letters. 35, 1, p. 117-119 3 p., 6680596.

Research output: Contribution to journalArticle

Screening
Metals
Electric breakdown
Oxides
Electric potential
4 Citations (Scopus)

A fast technique to screen carrier generation lifetime using DLTS on MOS capacitors

Elhami Khorasani, A., Schroder, D. K. & Alford, T., 2014, In : IEEE Transactions on Electron Devices. 61, 9, p. 3282-3288 7 p., 6867334.

Research output: Contribution to journalArticle

MOS capacitors
Deep level transient spectroscopy
Screening
Capacitors
Metals
5 Citations (Scopus)
Thin film transistors
transistors
Lighting
illumination
Vacancies
6 Citations (Scopus)
Transport properties
Indium
Optical properties
solar cells
transport properties
6 Citations (Scopus)

Enhanced power conversion efficiency of organic solar cells by embedding Ag nanoparticles in exciton blocking layer

Kim, I., Fleetham, T., Choi, H. W., Choi, J. Y., Lee, T. S., Jeong, D. S., Lee, W. S., Lee, K. S., Lee, Y. K., Alford, T. & Li, J., 2014, In : Organic Electronics: physics, materials, applications. 15, 10, p. 2414-2419 6 p.

Research output: Contribution to journalArticle

Excitons
embedding
Conversion efficiency
solar cells
excitons
7 Citations (Scopus)

Flexible sensors based on radiation-induced diffusion of ag in chalcogenide glass

Dandamudi, P., Mahmud, A., Gonzalez Velo, Y., Kozicki, M., Barnaby, H., Roos, B., Alford, T., Ailavajhala, M., Mitkova, M. & Holbert, K., Dec 1 2014, In : IEEE Transactions on Nuclear Science. 61, 6, p. 3432-3437 6 p., 6949157.

Research output: Contribution to journalArticle

Radiation
Glass
glass
sensors
Sensors
6 Citations (Scopus)

Gate-controlled reverse recovery for characterization of LDMOS body diode

Khorasani, A. E., Griswold, M. & Alford, T., Nov 1 2014, In : IEEE Electron Device Letters. 35, 11, p. 1079-1081 3 p., 6895242.

Research output: Contribution to journalArticle

Diodes
Recovery
MOSFET devices
Monitoring
Electric potential
11 Citations (Scopus)

Improved efficiency of P3HT: PCBM solar cells by incorporation of silver oxide interfacial layer

Das, S. & Alford, T., Jul 28 2014, In : Journal of Applied Physics. 116, 4, 044905.

Research output: Contribution to journalArticle

silver oxides
solar cells
shunts
ITO (semiconductors)
equivalent circuits
5 Citations (Scopus)

Optically excited mos-capacitor for recombination lifetime measurement

Khorasani, A. E., Schroder, D. K. & Alford, T., Oct 1 2014, In : IEEE Electron Device Letters. 35, 10, p. 986-988 3 p., 6878420.

Research output: Contribution to journalArticle

MOS capacitors
Epitaxial layers
Capacitors
Impurities
Monitoring
30 Citations (Scopus)
Multilayers
Electrodes
Multilayer films
Sheet resistance
Composite materials
11 Citations (Scopus)

Self-assembled monolayer modified ITO in P3HT: PC61BM organic solar cells with improved efficiency

Das, S., Joslin, J. & Alford, T., May 2014, In : Solar Energy Materials and Solar Cells. 124, p. 98-102 5 p.

Research output: Contribution to journalArticle

Self assembled monolayers
Tin oxides
Short circuit currents
Indium
Solar cells
23 Citations (Scopus)

Solvent-controlled spin-coating method for large-scale area deposition of two-dimensional silica nanosphere assembled layers

Choi, J. Y., Alford, T. & Honsberg, C., May 27 2014, In : Langmuir. 30, 20, p. 5732-5738 7 p.

Research output: Contribution to journalArticle

Nanospheres
Spin coating
Silicon Dioxide
Dimethylformamide
coating
1 Citation (Scopus)

Structural properties of ZnO nanowires directly grown on a carbon film in ZnCl2aqueous solution

Choi, H. W., Theodore, N. D., Das, S., Dhar, A. & Alford, T., Nov 15 2014, In : Journal of Crystal Growth. 406, p. 26-30 5 p.

Research output: Contribution to journalArticle

Carbon films
Nanowires
Structural properties
nanowires
carbon
2013
2 Citations (Scopus)

Characterization and adhesion in Cu/Ru/SiO2/Si multilayer nano-scale structure for Cu metallization

Chawla, N., Venkatesh, S. H., Singh, D. R. P. & Alford, T., Apr 2013, In : Journal of Materials Engineering and Performance. 22, 4, p. 1085-1090 6 p.

Research output: Contribution to journalArticle

Metallizing
Multilayers
Adhesion
Glues
Delamination
3 Citations (Scopus)

Effective dopant activation by susceptor-assisted microwave annealing of low energy boron implanted and phosphorus implanted silicon

Zhao, Z., Theodore, N. D., Vemuri, R. N. P., Lu, W., Lau, S. S., Lanz, A. & Alford, T., Dec 28 2013, In : Journal of Applied Physics. 114, 24, 244903.

Research output: Contribution to journalArticle

phosphorus
boron
activation
microwaves
annealing
8 Citations (Scopus)

Effective dopant activation via low temperature microwave annealing of ion implanted silicon

Zhao, Z., David Theodore, N., Vemuri, R. N. P., Das, S., Lu, W., Lau, S. S. & Alford, T., Nov 4 2013, In : Applied Physics Letters. 103, 19, 192103.

Research output: Contribution to journalArticle

activation
microwaves
annealing
silicon
ions

Effect of low-temperature microwave processing and copper content on the properties of Ag-Cu thin film binary alloys

Das, S. & Alford, T., Apr 2013, In : JOM. 65, 4, p. 534-537 4 p.

Research output: Contribution to journalArticle

Binary alloys
Copper
Microwaves
Thin films
Processing
electrical property
annealing
optical property
silver
electrode