자료유형  

 학위논문

Control Number  

0017164439

International Standard Book Number  

9798346389859

Dewey Decimal Classification Number  

620

Main Entry-Personal Name  

Yuan, Yue.

Publication, Distribution, etc. (Imprint  

[S.l.] : The Pennsylvania State University., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

204 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-05, Section: B.

General Note  

Advisor: Asbury, John B.

Dissertation Note  

Thesis (Ph.D.)--The Pennsylvania State University, 2024.

Summary, Etc.  

요약Organic solar cells (OSCs) based on polymer donor and non-fullerene small molecule acceptor bulk heterojunctions have emerged as the leading candidates to replace the traditional inorganic solar cells for their flexibility, tailorability, and potential for low-cost manufacturing. Among the high performance OSCs, PM6:Y6 has gained a lot of attention in recent years because of its high power conversion efficiency (PCE) of over 15%. This extraordinary performance mainly comes from: 1, The complementary absorption of the donor and acceptor molecules. 2, The barrierless charge separation at the donor acceptor interfaces. Despite the rapid progress made in the organic photovoltaics (OPVs) field, a comprehensive understanding of how the materials morphology affects its optoelectronics properties like charge separation efficiency remains incomplete. Such information is essential for the future design of OPV molecules.In this dissertation, time-resolved mid-infrared (TRIR) spectroscopy is used to directly probe the polaron generation efficiency in a series of PM6:Y6 thin films with different donor acceptor weight ratios (DARs). The DAR induced Y6 aggregation change is monitored by photoluminescence spectroscopy and grazing incidence wide angle X-ray scattering. The similar trend between the polaron generation efficiency variation and the morphology variation against the DAR reveals the relation between molecular aggregation and charge separation. This work provides first direct experimental evidence for the aggregation effect on reducing the Coulomb attraction between the hole and electron in the charge transfers states and promoting charge separation.

Subject Added Entry-Topical Term  

Silicon.

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Electrodes.

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Semiconductors.

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Aggregates.

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Voltammetry.

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Thin films.

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Industrial plant emissions.

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Advanced materials.

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Annealing.

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Polymers.

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Nuclear energy.

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Fourier transforms.

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Cadmium.

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Flexibility.

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Indium.

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Molecular structure.

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Alternative energy sources.

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Quantum dots.

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Alternative energy.

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Atmospheric sciences.

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Condensed matter physics.

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Materials science.

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Mathematics.

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Nuclear engineering.

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Nuclear physics.

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Polymer chemistry.

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Quantum physics.

Added Entry-Corporate Name  

The Pennsylvania State University.

Host Item Entry  

Dissertations Abstracts International. 86-05B.

Electronic Location and Access  

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Control Number  

joongbu:654015