Relationship Between Thermoelectric Properties and Morphology of Doped P3HT Thin Films for Potential Thermoelectric Appl
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.324
Relationship Between Thermoelectric Properties and Morphology of Doped P3HT Thin Films for Potential Thermoelectric Applications Jonathan J. Montes1,3, Harold O. Lee III1*, Faniya C. Doswell1,3, and Sam-Shajing Sun1,2,3
1
Center for Materials Research, Norfolk State University, Norfolk, VA 23504, USA
2
PhD Program in Materials Science and Engineering, Norfolk State University, Norfolk, VA 23504, USA
3
Department of Chemistry, Norfolk State University, Norfolk, VA 23504, USA
ABSTRACT
Polymeric conjugated materials are very promising for developing future soft material-based semiconductors, conductors, electronic and optoelectronic devices due to their inherent advantages such as flexibility, low-cost, ease of processability, and decreased harmful waste. Like their inorganic counterparts, the addition of certain dopants can significantly alter the electronic and optoelectronic properties of the host conjugated polymers or composites allowing modification for a variety of electronic/optoelectronic applications. One way to improve device performance is through the process of thermal annealing. Annealing allows for polymer matrices to self-assemble into a lower energy state which typically leads to increased crystallinity and higher charge mobility. In this work, we plan to evaluate the effects of annealing on doped P3HT films to understand its effects on optoelectronic and electronic properties focusing solely on crystallinity and charge carriers. Further understanding of the connection between annealing and doping in polymeric conjugated materials and thermoelectric properties will allow for an increase net output from multifunction materials and devices.
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INTRODUCTION As the demand for sustainable and renewable sources of energy steadily increases, research in thermoelectric materials and devices has increased as well. The capability of thermoelectric materials to convert heat into electricity has led to the development of solid-state devices that can make use of waste heat. Thermoelectric research has been mostly focused on inorganic Telluride based alloys; Bi2Te3 and PbTe alloys in particular. While their thermoelectric properties are exceptional, they are plagued by environmental toxicity and relatively high thermal conductivities [1]. In response to these issues, organic semiconductors have come into research focus. Polymer based semiconductors and conductors exhibit advantages such as being lightweight, flexible, easily scalable, easily processable, low in production cost, and easily tunable [2]. Like their inorganic counterparts, the addition of certain dopants can tune the electronic and optoelectronic properties of polymeric semiconductors for specific uses. For inorganic semiconduc
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