Polarization‐Driven Self‐Powered Photodetection in a Single‐Phase Biaxial Hybrid Perovskite Ferroelectric

• Published in: Angewandte Chemie International Edition Vol. 58; no. 41; pp. 14504 - 14508
• Main Authors: Liu, Xitao, Wang, Sasa, Long, Peiqing, Li, Lina, Peng, Yu, Xu, Zhiyun, Han, Shiguo, Sun, Zhihua, Hong, Maochun, Luo, Junhua
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 07.10.2019
• Edition: International ed. in English
• Subjects: Bismuth compounds; Broken symmetry; Curie temperature; Ferroelectric materials; Ferroelectricity; ferroelectrics; Optoelectronic devices; Perovskites; photodetection; Photoelectric effect; Photoelectric emission; Photoelectricity; Polarization; Response time; perovskites; ferroelectrics; photodetection
• ISSN: 1433-7851; 1521-3773; 1521-3773
• DOI: 10.1002/anie.201907660

Self‐powered photodetection driven by ferroelectric polarization has shown great potential in next‐generation optoelectronic devices. Hybrid perovskite ferroelectrics that combine polarization and semiconducting properties have a promising position within this portfolio. Herein, we demonstrate the realization of self‐powered photodetection in a new developed biaxial ferroelectric, (EA)2(MA)2Pb3Br10 (1, EA is ethylammonium and MA is methylammonium), which displays high Curie temperature (375 K), superior spontaneous polarization (3.7 μC cm−2), and unique semiconducting nature. Strikingly, without an external energy supply, 1 exhibits an direction‐selectable photocurrent with fascinating attributes including high photocurrent density (≈4.1 μA cm−2), high on/off switching ratio (over 106), and ultrafast response time (96/123 μs); such merits are superior to those of the most active ferroelectric oxide BiFeO3. Further studies reveal that strong inversion symmetry breaking in 1 provides a desirable driving force for carrier separation, accounting for such electrically tunable self‐powered photoactive behaviors. This work sheds light on exploring new multifunctional hybrid perovskites and advancing the design of intelligent photoelectric devices. The biaxial ferroelectric (EA)2(MA)2Pb3Br10 (1; EA=ethylammonium, MA=methylammonium) displays a high Curie temperature (375 K), superior spontaneous polarization (3.7 μC cm−2), and unique semiconductor properties. Even without an external energy supply, 1 exhibits a direction‐selectable photocurrent with a high photocurrent density, high on/off switching ratio, and ultrafast response time.