Beyond Conventional Pyroelectrics: 2D‐Layered Perovskites for Next Generation Pyro‐Phototronic Devices

ABSTRACT Two‐dimensional (2D) layered halide perovskites emerged as one of the most interesting semiconducting systems with a unique combination of quantum well structure, excellent optical and semiconducting properties. The structural flexibility allows us to engineer multifunctional properties in these perovskites such as piezo‐, pyro‐, and ferro‐electricity. The convergence of pyro‐ and ferroelectric properties, along with the photoexcitation and semiconducting properties make them ideal candidates for the investigation of emergent phenomena of pyro‐phototronic or ferro‐pyro‐phototronic effects to design next‐generation self‐powered optoelectronic devices. This review is focused on providing an overview of design strategies in 2D layered halide perovskites which gives rise to non‐centrosymmetric crystal structures. Furthermore, we have discussed the current synthesis strategies and their multi‐modal applications in photodetection, and optical communication has also been discussed. Finally, a comprehensive summary has been provided on the design and applications of emerging 2D‐layered halide perovskite materials in pyro‐phototronic effect, while the current challenges and future outlooks are also discussed.