6533b833fe1ef96bd129c116
RESEARCH PRODUCT
High-sensitive switchable photodetector based on BiFeO3 film with in-plane polarization
Er-jia GuoEr-jia GuoHuiying HaoJie XingZhiyuan ZhengChang-chun ZhaoJingjing Dongsubject
PhotocurrentMaterials sciencePhysics and Astronomy (miscellaneous)business.industryPhotoconductivityPolingOptoelectronicsPhotodetectorHigh voltagebusinessFerroelectricityVoltageDark currentdescription
A high-sensitive and fast-response photodetector based on BiFeO3 (BFO) ferroelectric thin film is fabricated using coplanar electrode configuration. A large photocurrent/dark current ratio is found up to two orders of magnitude at 1 V bias. Enhanced photocurrent and rectification behavior of the photodetector are observed after applying high voltage pulses to the BFO film. The short-circuit current varies systematically with the poling process and increases linearly with the light density. On the contrary, the open-circuit voltage keeps as a constant during the measurements. We attribute these behaviors to the depolarization field and the interfacial fields at the film-electrode interfaces. The BFO device presents a peak response of 0.15 mA/W at 365 nm and the response speed is on the order of tens of nanoseconds. Our work highlights the potential application of photodetector based on the ferroelectric materials.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-01-19 | Applied Physics Letters |