| Инд. авторы: | Sturman B., Podivilov E. |
| Заглавие: | Tip-enhanced bulk photovoltaic effect |
| Библ. ссылка: | Sturman B., Podivilov E. Tip-enhanced bulk photovoltaic effect // Physical Review B. - 2017. - Vol.96. - Iss. 13. - Art.134107. - ISSN 2469-9950. - EISSN 2469-9969. |
| Внешние системы: | DOI: 10.1103/PhysRevB.96.134107; WoS: 000412746300002; |
| Реферат: | eng: Using the conventional macroscopic description of the bulk photovoltaic effect we analyze the light-induced currents and electric fields arising in the optical configuration with a continuous bottom electrode and a small circular top electrode. This scheme is relevant to recent experiments on the tip-enhanced photovoltaic effect in ferroelectrics. It is shown that a light-induced electric field remains nonzero inside the sample even in the short-circuit regime. Moreover, it is enhanced compared to the photovoltaic field in a large area and strongly enhanced near the top electrode. A field-assisted collection of charge carriers from the illuminated area produces a strong local enhancement of the current density near the top electrode. The tip-enhanced electric field is typically parallel to the photovoltaic current. It is sufficient to repolarize the crystal near the top electrode. The effect of the tip enhancement on the light-current transformation efficiency is considered, and predictions for the tip radius and sample thickness dependencies of the total light-induced current are made.
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| Ключевые слова: | FIELD; FERROELECTRICS; |
| Издано: | 2017 |
| Физ. характеристика: | 134107 |