2016 Fiscal Year Research-status Report
Bottom-up Construction of Semi-Conductive/Ferroelectric Polymer Hybrid Nanofilms for Flexible Devices
| Project/Area Number |
16K17953
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| Research Institution | Tohoku University |
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Principal Investigator |
朱 慧娥 東北大学, 多元物質科学研究所, 助教 (70754539)
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Keywords | polarization / memory / Langmuir-Blodgett / polymer blends / Ferroelectricity |
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| Outline of Annual Research Achievements |
Ferroelectric poly(vinylidene fluoride)/semiconductive polythiophene (P3CPenT) blend monolayers were successfully developed at varying blend ratios using Langmuir-Blodgett technique. All the monolayers can be transferred regularly and repeatedly with transfer ratios of unity onto various substrates irrespective of the wettability of the substrates. Because of the precisely controllable bottom-up construction, semiconductive polymer were dispersed homogeneously in the ferroelectric matrix. Moreover, the ferroelectric matrix contains almost 100% beta crystals out of crystalline parts. The research results have been presented in several international and domestic conferences, which was highly recongnized by the other participants. Research papers on the results are being prepared.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
According to the research proposal, “Bottom-up Preparation of Ferroelectric/Semiconductive Polymer Hybrid Nanofilms” and “Characterization of Film Properties: surface morphologies, crystallization, density and ferroelectricity” should be achieved at the first year. Such work have been conducted and carried out as planned. The blend monolayers was successfully prepared with controllable film thickness at two nanometer scale. The film morphologies and crystallization properties were also confirmed by various methods, such as AFM, SEM, FT-IR, and so on. Therefore, the research is being proceeded smoothly.
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| Strategy for Future Research Activity |
In the future, memories devices based on the prepared Ferroelectric/Semiconductive Polymer Hybrid Nanofilms will be fabricated and studied to prove the viability and feasibility of the ferroelectric PVDF LB nanofilms as nanoscale building blocks to adjust electronic properties as proposed. The prepared devices will be carefully characterized to obtain the ferroelectric displacement (D)-electric field (E) hysteresis loops using Sawyer-Tower circuit. The current (I)-voltage (V) characteristics will be studied using an Agilent 4284A instrument. By changing the polarization direction of the PVDF matrix, the ferroelectricity-modulated charge transfer and accumulation properties will be characterized. Besides these measurements, the operation endurance and retention will be investigated at the on- or off-state (a negative or positive polarized state of PVDF). Moreover, the bending lifetime for felxible devices will be also studied.
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| Causes of Carryover |
At the first year, research work was focused on the monolayer and blend film preparation, which was proceeded very smoothly based on my previous research experiences. Therefore, the cost is less than that planned. Moreover, I missed the abstract sumbimission to join MRS fall meeting 2016 which was planned in the proposal.Due to these reasons,the incurring amount was caused to be used next fical year.
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| Expenditure Plan for Carryover Budget |
In the next fiscal year, device preparation, characterization and evaluation, paper publishing etc. will be conducted. The results will be presented at several domestic and international conferences.
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