Kayaharman, MuhammedDas, TaylanSeviora, GregorySaritas, ResulAbdel-Rahman, EihabYavuz, Mustafa2021-01-142021-01-142020Kayaharman, M., Daş, T., Seviora, G., Saritas, R., Abdel-Rahman, E., Yavuz, M. (2020). Long-Term Stability of Ferroelectret Energy Harvesters. Materials, 13(1):42.1996-1944https://doi.org/10.3390/ma13010042https://hdl.handle.net/20.500.12587/12890DAS, MEMIK TAYLAN/0000-0002-9872-8977; Kayaharman, Muhammed/0000-0002-1567-4142; Abdel-Rahman, Eihab/0000-0002-3709-7593Cellular polypropylene (PP) has been recently used in energy harvesting applications. In this work, we investigate its viability and long-term stability under various operating conditions. Specifically, the effect of constant stress and stress cycling on output power and long-term stability of ferroelectret energy harvesters is analyzed. Our findings show that after 112 days constant stress significantly increases the piezoelectric charge constant d(33) and output power from 0.51 mu W for a stress-free harvester to 2.71 mu W. It also increases the harvester center frequency from 450 to 700 Hz and decreases its optimal resistance from 7 to 5.5 M Omega.eninfo:eu-repo/semantics/openAccessenergy harvestersferroelectretpiezoelectricArticle13110.3390/ma130100422-s2.0-8507894371731861779Q2WOS:000515499300042Q1