2013 Fiscal Year Final Research Report
Anomalous photovoltaic effect based on spontaneous polarization of ferroelectric liquid crystals
| Project/Area Number |
24655132
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Functional materials chemistry
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| Research Institution | Kagawa University |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | 液晶 / 液晶性半導体 / 強誘電性液晶 / 異常光起電力効果 / オリゴシロキサン / キラルスメクティックＣ相 / ホール輸送 / 自発分極 |
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| Research Abstract |
Ferroelectric liquid-crystalline (LC) phenylterthiophene derivatives bearing a decenyl group, a disiloxane chain, and a tetracyclosiloxane ring has been synthesized. These compounds exhibit a chiral smectic C (SmC*) phase, where its spontaneous polarization exceeds 100 nCcm-2. The hole mobilities determined by a time-of-flight method were on the order of 1x10-4 cm2V-1s-1. The compound having decenyl group exhibits an anomalous photovoltaic effect in the SmC* phase. It should be noted that even the compound bearing a bulky cyclotetrasiloxane ring exhibit an enatiotropic SmC* phase. The compound bearing a decenyl chain exhibits anomalous photovoltaic effect in the SmC* phase. Under zer-bias, photocurrent in the reversed direction was generated when DC bias was aplied to the sample before light illumination. The polarity of the zero-bias photocurrent was changed by the sign of the DC bias before the illumination.
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