Author details
Author's Published Works
Scheduled Maintenance on Monday 1/13/2025
Single article sales and account management will be unavailable from 5:00 AM - 7:00 PM ET (09:00 - 23:00 UTC). We apologize for the inconvenience.
Author details
Showing 1-11 of 11 results
- Sort
Filter Results
Show
Sort By
Results
Development of an Optical Library for Coevaporated CdSexTe1−x
António J. N. Oliveira;Bin Du;Kevin D. Dobson;Jennifer P. Teixeira;Maria R. P. Correia;Pedro M. P. Salomé;William N. Shafarman
The conversion efficiency of CdTe solar cells may be improved by bandgap engineering, i.e., changing the bandgap value through the addition of Se in the absorber. The Se alloying enables a short-circuit current density improvement, as it leads to a bandgap energy value decrease. Furthermore, it has been associated with increased minority carrier lifetimes, assuring high open-circuit voltage values...Show More
Towards Perovskite Vapor Transport Deposition: PbI2 Deposition and Modeling in a Close Space Vapor Transport Configuration
Alexander J. Harding;Austin G. Kuba;Kevin D. Dobson;Ujjwal K. Das;Babatunde A. Ogunnaike;William N. Shafarman
2021 IEEE 48th Photovoltaic Specialists Conference (PVSC)
Year: 2021 | Conference Paper |
Interactions between temperature, pressure, and deposition rate are explored for the deposition of PbI2 in a close space vapor transport (CSVT) geometry. The data presented here confirm that PbI2 deposition occurs through diffusive mass transport based on strong correlations between the deposition rate and PbI2 concentration gradient from the source and to the substrate. The calculated deposition ...Show More
The Role of Oxygen Exposure on the Performance of All-Vapor-Processed Perovskite Solar Cells with CuPC Hole Transport Layers
Austin Kuba;Bin Du;Alex Harding;Kevin Dobson;Brian McCandless;Ujjwal Das;William Shafarman
2021 IEEE 48th Photovoltaic Specialists Conference (PVSC)
Year: 2021 | Conference Paper |
Cited by: Papers (2)
Methylammonium lead iodide perovskite solar cells were made using an all-vapor process, including two-step close space vapor transport-processed MAPI and evaporated copper phthalocyanine (CuPC). Solar cells fabricated entirely in a nitrogen glovebox had poor performance due to s-shaped J-V curves and fill factors (FF) <45%. Solar cells exposed to dry air in a desiccator for 7 days, or where O2 was...Show More
Substrate-Dependent Effects on the Growth of Methylammonium Lead Iodide Perovskites via Close Space Vapor Transport
Austin Kuba;Alexander Harding;Brian McCandless;Kevin Dobson;Ujjwal Das;Babatunde Ogunnaike;William Shafarman
2020 47th IEEE Photovoltaic Specialists Conference (PVSC)
Year: 2020 | Conference Paper |
Cited by: Papers (1)
Close space vapor transport is used to investigate PbI2 deposition and the reaction of PbI2 with CH3NH3I to form CH3NH3PbI3 (MAPI) on nanocrystalline (CdS) or amorphous (SnO2) electron transport layers (ETL). The crystallographic structure and surface morphology of PbI2 thin films and the resultant MAPI films after reaction have strong dependence on ETL substrates. Smoother morphology, stronger cr...Show More
Direct Laser Patterned Electroplated Copper Contacts for Interdigitated Back Contact Silicon Solar Cells
Kevin D. Dobson;Zeming Sun;Ugochukwu Nsofor;Ujjwal Das;Arpan Sinha;Mool Gupta;Steven S. Hegedus
2019 IEEE 46th Photovoltaic Specialists Conference (PVSC)
Year: 2019 | Conference Paper |
Laser patterning of seed layers for Cu electroplated interdigitated contacts on Ni/a-SiNx:H/Si substrates is presented. Damage was controlled by varying the laser conditions. Cu growths shorted the contacts due to conductive residues in the scribe lines, but were attenuated with pre-deposition etching yielding electrically-isolated plated fingers. Parasitically-plated Cu stripes were now observed ...Show More
Modeling and Analysis of Photovoltaic Electrochemical System Using Module-Level Power Electronics
Gowri M. Sriramagiri;Nuha Ahmed;Kevin D. Dobson;Steven S. Hegedus
2017 IEEE 44th Photovoltaic Specialist Conference (PVSC)
Year: 2017 | Conference Paper |
Cited by: Papers (1)
The design of a model PV-electrolysis system using a practical water electrolyzer and a commercial solar module is presented and its day-long operation simulated. The fact that photovoltaic electrochemical (PV-EC) devices do not always operate under 1-Sun illumination is often overlooked, which implies that the PV source may not always provide sufficient voltage for electrolyzer operation. The ene...Show More
Broadband Ta2O5 moth-eye antireflection coatings for tandem solar cells on Si
Bo Yuan;Brian Thibeault;David Payne;James Mutitu;Ivan Perez-Wurfl;Kevin Dobson;Brianna Conrad;Allen Barnett;Robert L. Opila
2017 IEEE 44th Photovoltaic Specialist Conference (PVSC)
Year: 2017 | Conference Paper |
Cited by: Papers (1)
Wafer-scale Ta2O5 moth-eye antireflection coatings are directly patterned on dual junction GaAsP/SiGe solar cells on Si substrates using deep UV photolithography and plasma etching. These sub-wavelength structures have an aspect ratio of 1.2, which results in excellent antireflection properties with an average reflectance of 7% over the entire 400-1100nm. Further optimizations of moth-eye and trad...Show More
Chalcogenide nanoparticles precursor in thin-film photovoltaics — Processing limitations
Daniela R. Radu;Dominik Berg;Mimi Liu;Kevin Dobson;Po-Yu Hwang;Cheng-Yu Lai
2016 IEEE 43rd Photovoltaic Specialists Conference (PVSC)
Year: 2016 | Conference Paper |
The operating hypothesis for using nanoparticle precursors to generate thin-film chalcogenide photovoltaics absorbers in Gen 2 PV is that the final crystalline film resulted from thermal treatment would mirror the original nanoprecursors composition. In addition, melting point depression as a result of the nano-confinement would enable relatively low processing temperatures. With nanoparticles mel...Show More
Processing of Cu(In,Ga)Se2 solar cells from electrodeposited precursors
2009 34th IEEE Photovoltaic Specialists Conference (PVSC)
Year: 2009 | Conference Paper |
Multi-step processing of Cu(In,Ga)Se2, incorporating electrodeposition (ED) of single-phase precursors coupled with physical vapor deposition (PVD) to tune film composition, is described. ED conditions for a range of precursors, including CuSe, Cu/In alloys and bi-layers, In2Se3, and Cu metal, were optimized. Precursors were processed by PVD at ~500°C for 45-60 minutes. Resultant Cu(In,Ga)Se2 devi...Show More
How CDTE Solar Cells Operate: Determining Collection using Bifacial Device Characterization
D. Desai;S. Hegedus;B. McCandless;R. Birkmire;K. Dobson;D. Ryan
2006 IEEE 4th World Conference on Photovoltaic Energy Conference
Year: 2006 | Conference Paper |
Cited by: Papers (8)
The fundamental mechanisms governing carrier transport and in CdTe solar cells are not well established. Effects of diffusion length (L), depletion width (W), primary heterojunction vs. back junction are not well correlated with the CdTe thickness (t), or back contact. Bifacial analysis provides quantitative insight into CdTe device operation by separating the effects of front and back junction. B...Show More
Single bath electrodeposition of CuInSe/sub 2/ and Cu(In,Ga)Se/sub 2/ for thin film photovoltaic cells
Conference Record of the Thirty-first IEEE Photovoltaic Specialists Conference, 2005.
Year: 2005 | Conference Paper |
In this paper, an electrodeposition (ED) process for growth of CuInSe/sub 2/ and Cu(In,Ga)Se/sub 2/ films from single baths is presented. The use of buffered baths and careful selection of bath concentrations allows good control of the composition of the deposited films. Prior to cell processing, CuInSe/sub 2/ and Cu(In,Ga)Se/sub 2/ films require recrystallization by annealing in H/sub 2/Se/Ar. Pr...Show More
IEEE Account
Purchase Details
Profile Information
Need Help?
- US & Canada: +1 800 678 4333
- Worldwide: +1 732 981 0060
- Contact & Support
- About IEEE Xplore
- Contact Us
- Help
- Accessibility
- Terms of Use
- Nondiscrimination Policy
- Sitemap
- Privacy & Opting Out of Cookies
A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity.
© Copyright 2025 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.