Impact of crystallization on ferro-, piezo- and pyro-electric characteristics in thin film P(VDF–TrFE) |
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| Affiliation: | 1. Univ. Grenoble Alpes, F-38000 Grenoble, France;2. CEA, DRT, LITEN, F-38054 Grenoble, France;3. ARKEMA-PIEZOTECH, F-68220 Hésingue, France;1. National Research University of Electronic Technology “MIET”, 124498 Moscow, Russia;2. Institute of Mathematical Problems of Biology, Keldysh Institute of Applied Mathematics RAS, 142290 Pushchino, Moscow Region, Russia;3. Scientific-Practical Materials Research Centre of NAS of Belarus, 220072 Minsk, Belarus;4. TEMA-NRD, Mechanical Engineering Department and Aveiro Institute of Nanotechnology (AIN), University of Aveiro, 3810-193 Aveiro, Portugal;5. Tver State University, 170100 Tver, Russia;1. Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, United Kingdom;2. Jeonju centre, Korea Basic Science Institute, Jeonju, Jeollabuk-do 561-180, Republic of Korea;3. Department of Electronic Engineering, Yeungnam University, Gyeongbuk 712-749, Republic of Korea;4. Department of Information and Communication Engineering, Daegu Gyeongbuk Institute of Science and Technology, Daegu 711-873, Republic of Korea;1. School of Materials Science & Engineering, Gwangju Institute of Science & Technology, Gwangju 500-712, Republic of Korea;2. GREMAN, UMR 7347, Université François Rabelais, Tours, France;1. State Key Laboratory of ASIC and System, School of Microelectronics, Fudan University, Shanghai, China;2. Solid-State Electronics, The Ångström Laboratory, Uppsala University, P.O. Box 534, 75121 Uppsala, Sweden;1. Engineering and Macromolecular Architectures, Institut Charles Gerhardt UMR 5253 (CNRS, UM, ENSCM), Ecole Nationale Supérieure de Chimie de Montpellier, 8 Rue de l’Ecole Normale, 34296 Montpellier Cedex 5, France;2. Piezotech S.A.S., Arkema-CRRA, Rue Henri-Moissan, 69493 Pierre-Bénite Cedex, France;1. Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan;2. Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai, 980-8577, Japan |
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| Abstract: | In this paper, the impact of the crystallization and polymer chain length of the P(VDF–TrFe) on its dielectric, ferroelectric, piezoelectric and pyroelectric properties are studied. X-rays diffraction (XRD) analysis have revealed that a higher β crystalline phase is obtained with a lower polymer chain length corresponding to a higher grain size for a P(VDF–TrFe) composition of 72.2/27.8 mol.%. The polymer chain morphology was characterized by scanning electron microscopy (SEM) where the fibrils orientation and width were extracted. By coupling both XRD analysis and chain morphology analysis, we have established that an increase of the grain size of the polymer chain enhances the ferroelectric and piezoelectric effects of the P(VDF–TrFe) layer. On the other hand, we observed a slight degradation of its pyroelectric properties. In addition, the piezoelectric coefficient (d33) of the P(VDF–TrFe) was enhanced by decreasing the molecular weight (Mw) of the copolymer, exhibiting a maximum value around ?50 pC/N for the composition 72.2/27.8 with a molecular weight of 470 kg/mol. On the opposite, the pyroelectric properties were enhanced for the lowest polymer crystalline grain size studied and obtained with the composition 71/29 mol.% with a molecular weight of 505 kg/mol. A pyroelectric coefficient of 37.8 μC/m2 K was measured. |
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| Keywords: | Piezoelectricity Pressure sensor Pyroelectricity P(VDF–TrFe) |
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