High Performance Self-Powered Photodetector Based on Ferroelectric (001)-Oriented Bi0.9La0.1FeO3 Thin Film

Self-powered photodetectors based on ferroelectric photovoltaic materials have attracted a lot of attentions in advanced optoelectronic systems. Because of the opposition between ferroelectric polarization and bandgap, however, low photocurrent output is a serious drawback for their photodetection performances. Here, excellent photodetection properties are achieved in a Bi0.9La0.1FeO3 (BLFO(001)) ferroelectric thin film with (001)-orientation growth. Its responsivity and detectivity can reach respectively 3.95 mA/W and 5.058 x 10 9 Jones under 100 mW/cm(2), which are almost 5 and 3 times than those of the Bi0.9La0.1FeO3 (BLFOro) thin film with random orientation. It is suggested that the BLFO(001) thin film with a strong domain structure possesses high polarization, which enhances depolarization field and decreases build-in field (E-bi) at Au/BLFO interface, generating a large driving force to separate photogenerated carriers. This work opens up a promising route to the development of high-performance ferroelectric photodetectors.