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dc.contributor.authorAdhikari, Tham
dc.contributor.otherQueen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.))en
dc.date.accessioned2018-05-31T18:23:05Z
dc.date.available2018-05-31T18:23:05Z
dc.identifier.urihttp://hdl.handle.net/1974/24264
dc.description.abstractSignificant progress has been achieved recently in the development of solution-processed organic photovoltaic devices, and they are now in the early stages of commercialization. However, achieving a smooth and homogenous film morphology without disturbing the optical and electronic properties of the active layer remains a crucial challenge to overcome for developing small-molecule materials. Strong molecular forces between conjugated small molecules can result in the nucleation of molecular crystals in solution, thereby resulting in an incomplete film coverage with high surface roughness. In addition, most small-molecule donor and acceptor materials tend to crystallize rapidly during solvent and thermal annealing to yield films of poor quality with polycrystalline small domains separated by grain boundaries, which act as electron traps and limit the long-range transport of electrons, and thusly impacting negatively device performance. To improve film quality with enhanced efficiency, several efforts are focused on molecular design which is based on high solubility, high optical absorption, high charge carrier mobility and a high interfacial gap between donor and acceptor. The approach studied herein consists in improving the film quality of PV devices by synthesizing amorphous glass-forming donors and acceptors with improved optical and electronic properties. Organic molecular glasses are a class of glass-forming materials that usually show outstanding glass-forming ability, and high kinetic stability towards crystallization. Organic materials functionalized with glass-forming mexylaminotriazine derivatives can remain indefinitely in the amorphous state at working temperatures, thereby preserving their optical and electronic properties. In this thesis, we developed molecular glasses functionalized with n- and p-type organic small molecules and studied their optoelectronic and photovoltaic properties. This thesis mainly focuses on the optical, electronic and photovoltaic properties of target mexylaminotriazine-functionalized amorphous donor and acceptor materials which show outstanding PV performance compared to their crystalline analogues. In addition, the structural and morphological properties of their respective thin films studied by XRD, AFM and SEM are also discussed.en_US
dc.language.isoenen_US
dc.relation.ispartofseriesCanadian thesesen
dc.rightsQueen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canadaen
dc.rightsProQuest PhD and Master's Theses International Dissemination Agreementen
dc.rightsIntellectual Property Guidelines at Queen's Universityen
dc.rightsCopying and Preserving Your Thesisen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectOrganic Molecular Glassen_US
dc.subjectOptical Propertiesen
dc.subjectBand Gapen
dc.subjectOrganic PV Cellsen
dc.subjectEfficiencyen
dc.titleAmorphous Organic Molecular Glasses for Photovoltaic Applicationsen_US
dc.typethesisen
dc.description.degreeDoctor of Philosophyen_US
dc.contributor.supervisorNunzi, Jean-Michel
dc.contributor.departmentChemistryen_US


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