Nested Inverse Opal Perovskite toward Superior Flexible and Self‐Powered Photodetection Performance

• Published in: Advanced materials (Weinheim) Vol. 32; no. 16; pp. e1906974 - n/a
• Main Authors: Tian, Wei, Min, Liangliang, Cao, Fengren, Li, Liang
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 01.04.2020
• Subjects: Bending machines; Carrier transport; flexible photodetectors; Materials science; Optoelectronic devices; Perovskites; Photoelectric effect; Photoelectric emission; Photometers; Portable equipment; self‐powered optoelectronic devices; Structural design; perovskites; self-powered optoelectronic devices; flexible photodetectors; structural design
• ISSN: 0935-9648; 1521-4095; 1521-4095
• DOI: 10.1002/adma.201906974

Flexible and self‐powered perovskite photodetectors have attracted tremendous research interests due to their applications in wearable and portable devices. However, the conventional planar structured photodetectors are always accompanied with limited device performance and undesired mechanical stability. Herein, a nested inverse opal (NIO) structured perovskite photodetector via a facile template‐assisted spin‐coating method is reported. The coupling effect of enhanced light capture, increased carrier transport, and improved perovskite film quality enables NIO device to exhibit superior photoresponse performance. The NIO photodetector exhibits a high responsivity of 473 mA W−1 and detectivity up to 1.35 × 1013 Jones at 720 nm without external bias. The NIO structure can efficiently release mechanical stress during the bending process and the photocurrent has no degradation even after 500 cycles of bending. Moreover, the unencapsulated NIO device can operate for over 16 d under ambient conditions, presenting a significantly enhanced environmental stability compared to the planar device. This work demonstrates that deliberate structural design is an effective avenue for constructing self‐powered, flexible, and stable optoelectronic devices. A flexible and self‐powered photodetector based on a nested inverse opal (NIO) perovskite structure is presented. The NIO device shows excellent photoresponse performance and mechanical durability. The remarkable improvement is attributed to the NIO‐structure‐enabled enhanced light harvesting, fast carrier transport, high perovskite crystallinity, and efficient stress release.