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Research Output 1900 2019

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

Implementing a 'design for online' approach for engineering courses

Mansfield, J. M., Alford, T. & Theodore, N. D., Jun 23 2018, In : ASEE Annual Conference and Exposition, Conference Proceedings. 2018-June

Research output: Contribution to journalConference article

Students
Materials science
Education
Blueprints
Studios

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

Misconception clarification in online graduate courses

Mansfield, J., Alford, T. & Theodore, N. D., Jun 23 2018, In : ASEE Annual Conference and Exposition, Conference Proceedings. 2018-June

Research output: Contribution to journalConference article

Students
Feedback
Materials science

Self-Powered, Inkjet Printed Electrochromic Films on Flexible and Stretchable Substrate for Wearable Electronics Applications

Azhar, E. A., Alford, T. & Yu, H., Aug 7 2018, Proceedings - IEEE 68th Electronic Components and Technology Conference, ECTC 2018. Institute of Electrical and Electronics Engineers Inc., Vol. 2018-May. p. 131-138 8 p. 8429541

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electrochromic devices
Substrates
Ink
Nanoparticles
Size determination
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

Ag-chalcogenide glass flexible radiation sensor: Impact of atomic ratio of Se on the TID influenced lateral diffusion of Ag

Mahmud, A., Gonzalez Velo, Y., Taggart, J., Bamaby, H. J., Kozicki, M., Holbert, K., Mitkova, M., Alford, T., Goryll, M. & Chen, W., Oct 31 2017, 2016 16th European Conference on Radiation and Its Effects on Components and Systems, RADECS 2016. Institute of Electrical and Electronics Engineers Inc., Vol. 2016-September. p. 1-3 3 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ionization
Radiation
ionization
Glass
dosage

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

The extent of dopant activation after microwave and rapid thermal anneals using similar heating profiles

Gunawansa, T., Zhao, Z., Theodore, N. D., Lanz, A. R. & Alford, T., Jan 1 2016, EPD Congress 2015. Springer International Publishing, p. 141-148 8 p.

Research output: Chapter in Book/Report/Conference proceedingChapter

Chemical activation
Microwaves
Doping (additives)
Heating
Annealing
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

As-doped Si's complex permittivity and its effects on heating curve at 2.45 GHz frequency

Varadan, S., Pan, G., Zhao, Z. & Alford, T., Jun 29 2015, 2015 Joint Conference of the IEEE International Frequency Control Symposium and the European Frequency and Time Forum, FCS 2015 - Proceedings. Institute of Electrical and Electronics Engineers Inc., p. 111-116 6 p. 7138802

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Silicon wafers
Permittivity
Doping (additives)
Heating
Silicon
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

Determination of complex permittivity for low- and high-loss materials at microwave frequencies

Varadan, S. K., Zhang, L., Pan, G. & Alford, T., May 7 2015, 2014 IEEE 23rd Conference on Electrical Performance of Electronic Packaging and Systems, EPEPS 2014. Institute of Electrical and Electronics Engineers Inc., p. 219-222 4 p. 7103638

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Microwave frequencies
Polychlorinated biphenyls
Permittivity
Copper
Bessel functions
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
4 Citations (Scopus)

Optimization of flexible Ag-chalcogenide glass sensors for radiation detection

Mahmud, A., Gonzalez Velo, Y., Saremi, M., Barnaby, H., Kozicki, M., Holbert, K., Mitkova, M., Alford, T., Goryll, M., Mahalanabis, D., Yu, W., Chen, W. & Taggart, J., Dec 24 2015, 2015 15th European Conference on Radiation and Its Effects on Components and Systems, RADECS 2015. Institute of Electrical and Electronics Engineers Inc., Vol. 2015-December. 7365644

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Radiation
Glass
optimization
glass
sensors
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
1 Citation (Scopus)

The extent of dopant activation after microwave and rapid thermal anneals using similar heating profiles

Gunawansa, T., Zhao, Z., Theodore, N. D., Lanz, A. R. & Alford, T., 2015, TMS Annual Meeting. January ed. Minerals, Metals and Materials Society, Vol. 2015-January. p. 141-148 8 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Chemical activation
Microwaves
Doping (additives)
activation
Heating
2 Citations (Scopus)

The impact of two-way formative feedback and web-enabled resources on student resource use and performance in materials courses

Krause, S., Baker, D. R., Carberry, A., Alford, T., Ankeny, C. J., Brooks, B. J., Koretsky, M. & Gibbons, B. J., 2015, 122nd ASEE Annual Conference and Exposition: Making Value for Society. American Society for Engineering Education

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Students
Feedback
Textbooks
Teaching
Warehouses
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
3 Citations (Scopus)

Characterizing and addressing student learning issues and misconceptions (SLIMs) in materials science with muddiest point reflections and fast formative feedback

Krause, S., Baker, D. R., Carberry, A., Alford, T., Ankeny, J., Koretsky, M., Brooks, B. J., Waters, C., Gibbons, B. J., Maass, S. & Chan, C., 2014, ASEE Annual Conference and Exposition, Conference Proceedings. American Society for Engineering Education

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Materials science
Students
Feedback
Monitoring
Warehouses
5 Citations (Scopus)
Thin film transistors
transistors
Lighting
illumination
Vacancies
Indium
Zinc Oxide
Gallium
Electric properties
Optical properties
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