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HL: Fachverband Halbleiterphysik
HL 28: Focus: Exploitation of Anisotropy in Organic Semiconductors I (joint session CPP/HL)
HL 28.3: Vortrag
Dienstag, 17. März 2020, 10:45–11:00, ZEU 222
Application of polar molecules to electret for vibrational energy generator: Improvement of device productivity and output power by utilizing spontaneous orientation polarization — •Yuya Tanaka1,2, Noritaka Matsuura1, and Hisao Ishii1 — 1Chiba University, Chiba, Japan — 2Japan Science and Technology Agency, PRESTO, Saitama, Japan
Electret-based vibrational energy generator (E-VEGs) have attracted much attention because they can generate electrical power from ambient vibrations. The challenges for E-VEGs are to: (i) simplify charging process for making electret and (ii) enhance output power (P) of the device. Recently, we developed polar molecules (PM), such as Alq3 and TPBi, based VEGs that do not require any charging process by utilizing spontaneous orientation of the molecules. To increase P of the device, enhancement of surface potential (SP), namely, order parameter of the molecule, is required. In this study, we prepared PM films with various deposition rate (r). We found that the SP becomes larger in the case of high r, suggesting that molecular orientation can be controlled by r. Further, the estimated surface charge density was comparable to conventional polymer-based electret after charging (typically, 2 mC/m2). We believe that the realization of PM-VEGs will open up the novel ways for supplying electrical energy to the various devices.