A thermodynamic and kinetic description of PCBM phase segregation and aggregation in P3HT:PCBM blends |
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| Affiliation: | 1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow Region, Russian Federation;2. Skolkovo Institute of Science and Technology, 143025 Skolkovo, Moscow Region, Russian Federation;1. Laboratoire de Physico-Chimie des Nano-Objets, INSA-Université de Toulouse, 135, Av. de Rangueil, 31075 Toulouse, France;2. Depto. de Matemáticas Aplicadas y Sistemas, Universidad Autónoma Metropolitana Cuajimalpa, México D.F., Mexico;3. Departamento de Física, Facultad de Ciencias, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos 62209, Mexico;1. State Key Laboratory on Integrated Optoelectronics, College of Electronics Science and Engineering, Jilin University, Changchun, 130012, People''s Republic of China;2. Beijing Tuocai Optoelectronics Technology Co. Ltd, Beijing, 100086, People''s Republic of China;1. Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China;2. Department of Chemistry and Biochemistry, Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106, USA;1. Institut für Angewandte Photophysik, Technische Universität Dresden, George-Bähr-Straße 1, 01069 Dresden, Germany;2. NaMLab gGmbH, Nöthnitzer Straße 64, 01187 Dresden, Germany;3. Institut für Halbleiter und Mikrosystemtechnik, Technische Universität Dresden, Nöthnitzer Straße 64, 01187 Dresden, Germany |
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| Abstract: | 
The kinetics and thermodynamics of PCBM phase segregation and aggregation in P3HT:PCBM blends has been studied. We develop a thermodynamic model for PCBM phase segregation in P3HT:PCBM blends which explains the formation of nanoscale crystallites which subsequently diffuse and coalesce into larger PCBM aggregates. We show that the formation of nanoscale crystallites during the film making process prevents spinodal decomposition of the P3HT:PCBM blends even at PCBM weight fractions above the spinodal decomposition boundary for the system. Finally, we demonstrate that the observed aggregate morphology can be understood in terms of a kinetic model based on the diffusional flux lines of PCBM crystallite which, in turn, govern the evolution of the macroscopic growth front. |
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| Keywords: | P3HT PCBM Aggregation Crystallisation |
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