Synthesis and Characterization of C60-Porphyrin Derivatives for Enhanced Photovoltaic Performance through Efficient Charge Generation and Transport
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University of Akron / OhioLINK
2011
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ndltd-OhioLink-oai-etd.ohiolink.edu-akron13013530452021-08-03T05:26:32Z Synthesis and Characterization of C60-Porphyrin Derivatives for Enhanced Photovoltaic Performance through Efficient Charge Generation and Transport Wang, Chien-Lung Chemistry Materials Science Molecular Physics Physical Chemistry supramolecular materials photovoltaics liquid crystals fullerenes porphyrins Although organic bulk-heterojunction photovoltaics has been developed for over 15 years, active material with ideal morphology for efficient solar radiation to electricity conversion has not yet been achieved. The thermally unstable morphology and convoluted charge transport pathway in this system lead to less efficient charge generation and transport. “Double cable polymers” comprised of p-type conjugated polymer backbone and n-type semiconductor side chains has been proposed to form thermally stable phase-separated electron donor (D)/electron acceptor (A) domains on the nanometer scale. However, due to the lack of control over primary chemical structure and secondary physical structure, desired phase structure obtained from this concept is still absent. This dissertation demonstrates two well-defined, thermally stable, supramolecular double cable structures with one p-type porphyrin columnar channel and three n-type C60 side channels formed by monoC60-Por 7 and 13. The helical structure of the column was determined to be a 12944 helix. Deshielding the C60 moiety from the peripheral alkyl chains allows the intercolumnar interaction of C60s. MonoC60-Por 15 thus forms a Colr phase, which has a core porphyrin columnar channel and four peripheral C60 side channels in close contact with the C60 channels in the neighboring columns. The well-defined and oriented bulk material contains a parallel array of hole and electron transport channels that are phase-separated at the molecular level. The structures provide large D/A interface and efficient charge transporting properties, which are highly desired for high photovoltaic performance. This supramolecular approach in the construction of such structures allows further performance optimization through molecular structural modifications to adjust and improve/balance the electronic properties in these hierarchical structures. It holds great promise in meeting all of the essential requirements for photovoltaic applications in a readily processible single molecular system. With two C60 moieties per molecule, trans-diC60-ZnPor (16) formed a thermally stable supramolecular sandwich structure constructed via alternative stacking of Zn (II) porphyrins and C60s. The formation of this stable phase is kinetically slow and requires annealing. Thus, a less ordered metastable phase was observed when directly cooled from the I phase. Compared to the supramolecular double cable structures formed by monoC60-Pors, increase of the number of C60 segments completely changes the phase behavior and phase structure of the C60-Por derivatives. Thus, formation of ordered phases of C60-Por derivatives relies on delicate molecular design and balance among C60-C60, Por-Por and C60-Por interactions. 2011-04-22 English text University of Akron / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=akron1301353045 http://rave.ohiolink.edu/etdc/view?acc_num=akron1301353045 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Chemistry Materials Science Molecular Physics Physical Chemistry supramolecular materials photovoltaics liquid crystals fullerenes porphyrins |
| spellingShingle |
Chemistry Materials Science Molecular Physics Physical Chemistry supramolecular materials photovoltaics liquid crystals fullerenes porphyrins Wang, Chien-Lung Synthesis and Characterization of C60-Porphyrin Derivatives for Enhanced Photovoltaic Performance through Efficient Charge Generation and Transport |
| author |
Wang, Chien-Lung |
| author_facet |
Wang, Chien-Lung |
| author_sort |
Wang, Chien-Lung |
| title |
Synthesis and Characterization of C60-Porphyrin Derivatives for Enhanced Photovoltaic Performance through Efficient Charge Generation and Transport |
| title_short |
Synthesis and Characterization of C60-Porphyrin Derivatives for Enhanced Photovoltaic Performance through Efficient Charge Generation and Transport |
| title_full |
Synthesis and Characterization of C60-Porphyrin Derivatives for Enhanced Photovoltaic Performance through Efficient Charge Generation and Transport |
| title_fullStr |
Synthesis and Characterization of C60-Porphyrin Derivatives for Enhanced Photovoltaic Performance through Efficient Charge Generation and Transport |
| title_full_unstemmed |
Synthesis and Characterization of C60-Porphyrin Derivatives for Enhanced Photovoltaic Performance through Efficient Charge Generation and Transport |
| title_sort |
synthesis and characterization of c60-porphyrin derivatives for enhanced photovoltaic performance through efficient charge generation and transport |
| publisher |
University of Akron / OhioLINK |
| publishDate |
2011 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=akron1301353045 |
| work_keys_str_mv |
AT wangchienlung synthesisandcharacterizationofc60porphyrinderivativesforenhancedphotovoltaicperformancethroughefficientchargegenerationandtransport |
| _version_ |
1719420131601285120 |