The effects of a quantum wire intermediate band, grown by molecular beam epitaxy, on the optical and electrical properties of solar cells are reported. To investigate the behavior of the intermediate band, the quantum wires were remotely doped at three different doping concentrations, the number of quantum wire layers was varied from three to twenty, and the solar cell structure was optimized. For all the structures, current-voltage and external quantum efficiency measurements were performed to examine the effect of absorption and power conversion of the intermediate band solar cell (IBSC). Time-resolved photoluminescence measurements showed that δ-doping can increase the lifetime of the excited electrons in the quantum wires. The quantum efficiency measurements revealed that the quantum wires extend the absorption spectrum in the infrared and produce a photocurrent by absorption of photons with energies below the GaAs band gap energy. In addition, the quantum wire intermediate band solar cell increased the solar conversion efficiency by 13.3% over the reference cell. An increase in the quantum efficiency was observed by increasing the number of quantum wire layers in the intermediate band. Furthermore, by optimizing the solar cell structure, the quantum efficiency and solar power conversion efficiency were substantially improved. Finally, temperature dependent current-voltage measurements reveal that the quantum wire intermediate band does not degrade the temperature sensitivity of the device. This research shows the potential for a quantum wire intermediate band as a viable option for creating higher efficiency solar cell devices.
","abstract_html":"<p>The effects of a quantum wire intermediate band, grown by molecular beam epitaxy, on the optical and electrical properties of solar cells are reported. To investigate the behavior of the intermediate band, the quantum wires were remotely doped at three different doping concentrations, the number of quantum wire layers was varied from three to twenty, and the solar cell structure was optimized. For all the structures, current-voltage and external quantum efficiency measurements were performed to examine the effect of absorption and power conversion of the intermediate band solar cell (IBSC). Time-resolved photoluminescence measurements showed that δ-doping can increase the lifetime of the excited electrons in the quantum wires. The quantum efficiency measurements revealed that the quantum wires extend the absorption spectrum in the infrared and produce a photocurrent by absorption of photons with energies below the GaAs band gap energy. In addition, the quantum wire intermediate band solar cell increased the solar conversion efficiency by 13.3% over the reference cell. An increase in the quantum efficiency was observed by increasing the number of quantum wire layers in the intermediate band. Furthermore, by optimizing the solar cell structure, the quantum efficiency and solar power conversion efficiency were substantially improved. Finally, temperature dependent current-voltage measurements reveal that the quantum wire intermediate band does not degrade the temperature sensitivity of the device. This research shows the potential for a quantum wire intermediate band as a viable option for creating higher efficiency solar cell devices.</p>","abstract_has_math":false,"creators":["Furrow, Colin Stuart"],"institution":null,"degree_name":"Doctor of Philosophy in Microelectronics-Photonics (PhD)","degree_level":"Dissertation","degree_discipline":null,"degree_department":null,"school":null,"contributors":["Singh, Surendra P.","Yu, Shui-Qing \"Fisher\""],"advisors":["Salamo, Gregory J."],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-07-01T07:00:00Z","date_published":"2015-07-01T07:00:00Z","updated_at":"2026-07-24T00:59:49Z","subjects":["Applied sciences","InGaAs","Quantam wire","Solar cell","Nanoscience and Nanotechnology"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://scholarworks.uark.edu/etd/1280","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Singh, Surendra P.","Yu, Shui-Qing \"Fisher\""]},{"key":"dc:contributor.advisor","label":"Advisor","values":["Salamo, Gregory J."]},{"key":"dc:creator","label":"Author","values":["Furrow, Colin Stuart"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2017-09-29T07:00:00Z"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Doctor of Philosophy in Microelectronics-Photonics (PhD)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Applied sciences","InGaAs","Quantam wire","Solar cell","Nanoscience and Nanotechnology"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholarworks.uark.edu/etd/1280"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The effects of a quantum wire intermediate band, grown by molecular beam epitaxy, on the optical and electrical properties of solar cells are reported. To investigate the behavior of the intermediate band, the quantum wires were remotely doped at three different doping concentrations, the number of quantum wire layers was varied from three to twenty, and the solar cell structure was optimized. For all the structures, current-voltage and external quantum efficiency measurements were performed to examine the effect of absorption and power conversion of the intermediate band solar cell (IBSC). Time-resolved photoluminescence measurements showed that δ-doping can increase the lifetime of the excited electrons in the quantum wires. The quantum efficiency measurements revealed that the quantum wires extend the absorption spectrum in the infrared and produce a photocurrent by absorption of photons with energies below the GaAs band gap energy. In addition, the quantum wire intermediate band solar cell increased the solar conversion efficiency by 13.3% over the reference cell. An increase in the quantum efficiency was observed by increasing the number of quantum wire layers in the intermediate band. Furthermore, by optimizing the solar cell structure, the quantum efficiency and solar power conversion efficiency were substantially improved. Finally, temperature dependent current-voltage measurements reveal that the quantum wire intermediate band does not degrade the temperature sensitivity of the device. This research shows the potential for a quantum wire intermediate band as a viable option for creating higher efficiency solar cell devices.
"]},{"key":"dc:title","label":"Title","values":["Development and Characterization of Intermediate-Band Quantum Wire Solar Cells"]}]}],"canonical_facts":{"dc:contributor":["Singh, Surendra P.","Yu, Shui-Qing \"Fisher\""],"dc:contributor.advisor":["Salamo, Gregory J."],"dc:creator":["Furrow, Colin Stuart"],"dc:date":["2015"],"dc:date.available":["2017-09-29T07:00:00Z"],"dc:description.abstract":["The effects of a quantum wire intermediate band, grown by molecular beam epitaxy, on the optical and electrical properties of solar cells are reported. To investigate the behavior of the intermediate band, the quantum wires were remotely doped at three different doping concentrations, the number of quantum wire layers was varied from three to twenty, and the solar cell structure was optimized. For all the structures, current-voltage and external quantum efficiency measurements were performed to examine the effect of absorption and power conversion of the intermediate band solar cell (IBSC). Time-resolved photoluminescence measurements showed that δ-doping can increase the lifetime of the excited electrons in the quantum wires. The quantum efficiency measurements revealed that the quantum wires extend the absorption spectrum in the infrared and produce a photocurrent by absorption of photons with energies below the GaAs band gap energy. In addition, the quantum wire intermediate band solar cell increased the solar conversion efficiency by 13.3% over the reference cell. An increase in the quantum efficiency was observed by increasing the number of quantum wire layers in the intermediate band. Furthermore, by optimizing the solar cell structure, the quantum efficiency and solar power conversion efficiency were substantially improved. Finally, temperature dependent current-voltage measurements reveal that the quantum wire intermediate band does not degrade the temperature sensitivity of the device. This research shows the potential for a quantum wire intermediate band as a viable option for creating higher efficiency solar cell devices.
"],"dc:identifier":["https://scholarworks.uark.edu/etd/1280"],"dc:subject":["Applied sciences","InGaAs","Quantam wire","Solar cell","Nanoscience and Nanotechnology"],"dc:title":["Development and Characterization of Intermediate-Band Quantum Wire Solar Cells"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Doctor of Philosophy in Microelectronics-Photonics (PhD)"]},"updated_at":"2026-07-24T00:59:49Z"}