X‐ray‐ultraviolet–visible‐near‐infrared photoresponses realized in a lead‐free hybrid perovskite ferroelectric through light‐induced ferro‐pyro‐phototronic effect
Dongying Fu,
Yanli Ma,
Shufang Wu,
Lin Pan,
Qi Wang,
Ruifang Zhao,
Xian‐Ming Zhang,
Junhua Luo
Affiliations
Dongying Fu
Institute of Crystalline Materials, Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province Taiyuan Shanxi the People's Republic of China
Yanli Ma
Institute of Crystalline Materials, Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province Taiyuan Shanxi the People's Republic of China
Shufang Wu
Institute of Crystalline Materials, Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province Taiyuan Shanxi the People's Republic of China
Lin Pan
Institute of Crystalline Materials, Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province Taiyuan Shanxi the People's Republic of China
Qi Wang
Institute of Crystalline Materials, Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province Taiyuan Shanxi the People's Republic of China
Ruifang Zhao
Institute of Crystalline Materials, Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province Taiyuan Shanxi the People's Republic of China
Xian‐Ming Zhang
College of Chemistry, Key Laboratory of Interface Science and Engineering in Advanced Material, Ministry of Education Taiyuan University of Technology Taiyuan Shanxi the People's Republic of China
Junhua Luo
State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences Fuzhou Fujian the People's Republic of China
Abstract Due to the built‐in electric field induced by spontaneous polarization in hybrid perovskite (HP) ferroelectrics, the devices based on them exhibit excellent performance in self‐powered photodetection. However, most of the self‐powered photodetector are made of lead‐based HP ferroelectrics and have a relatively narrow photoresponse waveband. Although lead‐free HPs solve the problem of lead toxicity, their optoelectronic performance is inferior to that of lead‐based HPs and photoresponse waveband is limited by its optical band gap, which hinders their further application. To solve this problem, herein, a lead‐free HP ferroelectric (HDA)BiI5 (HDA is hexane‐1,6‐diammonium) with large spontaneous polarization shows an enhanced photocurrent and achieves x‐ray‐ultraviolet–visible‐near‐infrared (x‐ray‐UV–Vis–NIR) photoresponse through the ferro‐pyro‐phototronic (FPP) effect. The ferroelectric, pyroelectric, and photovoltaic characteristics coupled together in a single‐phase (HDA)BiI5 ferroelectric is an effective way to improve the performance of the devices. What is particularly attractive is that the FPP effect not only improves the optoelectronic performance of (HDA)BiI5, but also achieves broadband photoresponses beyond its optical absorption range. Especially, the current boosting with an exceptional contrast of ~1100% and 2400% under 520 and 637 nm, respectively, which is associated with FPP effect. Meanwhile, single crystal self‐powered photodetector based on (HDA)BiI5 also exhibit significant FPP effects even under high‐energy x‐ray, which owns an outstanding sensitivity of 170.7 μC Gy−1 cm−2 and a lower detection limit of 266 nGy s−1 at 0 V bias. Therefore, it is of great significance to study the coupling of multiple physical effects and improve device performance based on lead‐free HP ferroelectrics.
