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Multi-functional Optoelectronic Substrates

Haghanifar, Sajad (2020) Multi-functional Optoelectronic Substrates. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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New bio-inspiration, micro-/nanomaterials, and micro-/nanomanufacturing processes offer unprecedented opportunities in engineering optoelectronic substrates for novel photon management strategies, difficult-to-realize material–property combinations, and new multi-functionality. In the past decade, discoveries in the multi-functional properties of micro-/nanostructured surfaces have led to a renaissance of activity in surface engineering, which have transformed substrates for a wide variety of rigid and flexible optoelectronic devices.

The most important properties are related to photon management, such as high transparency, antireflection, and haze control. Transparency is the most important property as this determines the amount of light that either goes into or out of the active region of the device. In addition, haze control is an important property for various devices. Displays and touch screens require low optical haze, as high haze can contribute to the blurriness of text and images viewed. In contrast, applications such as solar cells and light emitting diodes (LEDs) would benefit from substrates with both high transparency and high haze. Substrates with high haze can increase how much light scatters into or out of the photoactive layers and may increase the solar cell power conversion efficiency and display or LED extraction efficiency, respectively.

In addition to photon management properties, a wide variety of other properties are important that are related to the reliability of the optical properties under a variety of stressors. This includes wettability-related properties such as anti-soiling, self-cleaning, stain-resistance, fog resistance, where it is beneficial for the substrate to maintain its optical properties after exposure to various particulates or liquids. Durability under abrasion, hydrostatic pressure, and repeated bending are also important. Finally, properties such as optical switching may also be useful for various applications.

In this study, we summarize our recent research progress in the micro-/nanostructuring of various optoelectronic substrate materials while discussing sources of bio-inspiration, advances in micro-/nanomanufacturing and machine learning strategies we used for fabrication of multi-functional optoelectronic substrates. These engineered surfaces have broad application to a wide variety of substrates for applications such as displays, solar cells, smartphones, light emitting diodes (LEDs), and e-paper, as well as new wearables, RF-ID tags, artificial skin, and medical/health sensors.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Haghanifar, Sajadsah175@pitt.edusah1750000-0003-2620-4792
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Thesis AdvisorLeu,
Committee MemberMostafa,
Committee MemberPaul,
Committee MemberYoung Jae,
Date: 31 July 2020
Date Type: Publication
Defense Date: 25 March 2020
Approval Date: 31 July 2020
Submission Date: 13 April 2020
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 142
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Industrial Engineering
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Antireflection; Light scattering; Machine learning; Optoelectronics; Self cleaning; Superomniphobic surfaces;
Date Deposited: 31 Jul 2020 14:47
Last Modified: 31 Jul 2020 14:47


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