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Light Management in Photovoltaic Devices and Nanostructure Engineering in Nitride-based Optoelectronic Devices

Han, Lu
http://orcid.org/0000-0003-1736-0881
http://rave.ohiolink.edu/etdc/view?acc_num=case1486996393294605

Abstract Details

2017, Doctor of Philosophy, Case Western Reserve University, EECS - Electrical Engineering.
Currently, there are several issues that limit the efficiency and performance of modern semiconductor optoelectronic devices. Photovoltaics are promising optoelectronic devices for generating electrical power directly from sunlight on a large scale, with the potential to reduce the worldwide usage of nonrenewable energy. One limiting factor to further enhance the conversion efficiency for solar cells is the undesired interfacial photon energy loss, which is attributed to the refractive index difference at the interface between the semiconductor materials and the surrounding medium. Light management by employing interfacial light coupling elements is one important strategy to further improve the efficiency of solar cells. In this dissertation, my research work focuses on improving the light trapping in solar cells by systematically designing microdome-based and impedance-matching concaved microdome-based structures, with the goal to achieve broadband omnidirectional antireflection. Light emitters using wide band gap semiconductors play important roles in industrial, residential and military applications. The performance of light emitters significantly depends on the design and quality of active medium in the devices. The second part of this dissertation focuses on the nanostructure design and engineering for quantum well active medium by utilizing the heterostructures of III-nitride and II-IV-nitride with the goal to achieve high efficiency light emitters. The novel type-II InGaN-ZnGeN2 QW heterostructures for high-performance blue-/green-/red-LEDs are able to address the charge separation issue in traditional III-nitride LEDs emitting in green and longer wavelength range. Further, the closely lattice-matched of GaN-ZnGeN2 coupled QW structure is able to achieve intersubband transitions promising for near-infrared quantum cascade laser applications.
Hongping Zhao (Committee Chair)
Roger French (Committee Member)
Christian Zorman (Committee Member)
Kathleen Kash (Committee Member)
Philip Feng (Committee Member)
210 p.
Electrical Engineering; Experiments; Optics; Physics; Solid State Physics
Light coupling; Interfacial coupling structures; Photovoltaics; Microdome structures; Concaved-dome structures; Nanostructure engineering; Optoelectric devices; LEDs; II-IV-nitride; III-nitride; Type-II QW; Near-IR quantum cascade laser

Recommended Citations

Citations

  • Han, L. (2017). Light Management in Photovoltaic Devices and Nanostructure Engineering in Nitride-based Optoelectronic Devices [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1486996393294605

    APA Style (7th edition)

  • Han, Lu. Light Management in Photovoltaic Devices and Nanostructure Engineering in Nitride-based Optoelectronic Devices. 2017. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1486996393294605.

    MLA Style (8th edition)

  • Han, Lu. "Light Management in Photovoltaic Devices and Nanostructure Engineering in Nitride-based Optoelectronic Devices." Doctoral dissertation, Case Western Reserve University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1486996393294605

    Chicago Manual of Style (17th edition)

case1486996393294605
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© 2017, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.