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Organic Photovoltaics Based on P3HT/PCBM: Correlating Efficiency and Morphology

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dc.contributor.advisorThomas P. Russell
dc.contributor.advisorTodd Emrick
dc.contributor.advisorDhandapani Venkataraman
dc.contributor.authorChen, Dian
dc.contributor.departmentUniversity of Massachusetts Amherst
dc.date2023-09-23T04:49:33.000
dc.date.accessioned2024-04-26T19:49:33Z
dc.date.available2024-04-26T19:49:33Z
dc.date.issued2011-09-01
dc.description.abstractControlling the morphology of thin films is key in optimizing the efficiency of polymer-based photovoltaic (PV) devices. The morphology and interfacial behavior of the multicomponent active layers confined between electrodes are strongly influenced by the preparation conditions. Results obtained in this work quantitatively show the photovoltaic device performance is strongly affected by the nanoscopic morphology, crystal orientation, composition distribution and the interdiffusion behavior of the photoactive layer. To better understand the physics of the photoactive layer in the organic photovoltaic devices, it is necessary to gain a quantitative understanding of the morphology and the manner in which it develops. A key element in the kinetics associated with the structure development is the interdiffusion of the components. To that end we used poly(3-hexylthiophene) (P3HT) / [6,6]-phenyl C61- butyric acid methyl ester (PCBM) bilayers as a model to investigate the interdiffusion of the components and its role in the development of the morphology. A detailed description of the diffusion behavior and the morphology developed from a layer of P3HT in contact with a layer of PCBM during thermal annealing is given. Amorphous P3HT and PCBM are shown to be highly miscible and PCBM can penetrate into the P3HT layer through the P3HT amorphous region and form the bulk heterojunction structure within a few second of annealing at 150 oC. The results indicated that one phase is a pure P3HT crystal domain and the other phase is the mixture of amorphous P3HT and PCBM, which is not consistent with a phase separation of the components by a spinodal decomposition mechanism. We put forth an alternative mechanism, namely a competitive crystallization/diffusion argument, to describe the origin of the morphology. These findings provide new insights and guidance in the generation of active layers in organic photovoltaics that are crucial in enhancing the device performance. Textured organic solar cells were also studied, providing another route to fabricate higher performance devices.
dc.description.degreeDoctor of Philosophy (PhD)
dc.description.departmentPolymer Science and Engineering
dc.identifier.doihttps://doi.org/10.7275/2387337
dc.identifier.urihttps://hdl.handle.net/20.500.14394/38880
dc.relation.urlhttps://scholarworks.umass.edu/cgi/viewcontent.cgi?article=1433&context=open_access_dissertations&unstamped=1
dc.source.statuspublished
dc.subjectMaterials Science and Engineering
dc.subjectPolymer and Organic Materials
dc.titleOrganic Photovoltaics Based on P3HT/PCBM: Correlating Efficiency and Morphology
dc.typedissertation
dc.typearticle
dc.typedissertation
digcom.contributor.authorisAuthorOfPublication|email:dianchen310@gmail.com|institution:University of Massachusetts Amherst|Chen, Dian
digcom.identifieropen_access_dissertations/434
digcom.identifier.contextkey2387337
digcom.identifier.submissionpathopen_access_dissertations/434
dspace.entity.typePublication
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