Properties of Excitons and Photogenerated Charge Carriers in Metal Halide Perovskites

• Published in: Advanced materials (Weinheim) 2019-11, Vol.31 (47), p.e1806671-n/a
• Main Authors: Jiang, Ying, Wang, Xiao, Pan, Anlian
• Format: Article
• Language: English
• Subjects: charge‐carrier recombination; charge‐carrier transport; Coupling; Current carriers; Dielectric properties; Diffusion length; exciton binding energy; Excitons; exciton–photon/phonon coupling; Materials science; metal halide perovskites; Metal halides; Optical properties; Optoelectronics; Organic light emitting diodes; Perovskites; Silicon
• ISSN: 0935-9648; 1521-4095
• DOI: 10.1002/adma.201806671

Metal halide perovskites (MHPs) have recently attracted great attention from the scientific community due to their excellent photovoltaic performance as well as their tremendous potential for other optoelectronic applications such as light‐emitting diodes, lasers, and photodetectors. Despite the rapid progress in device applications, a solid understanding of the photophysical properties behind the device performance is highly desirable for MHPs. Here, the properties of excitons and photogenerated charge carriers in MHPs are explored. The unique dielectric constant properties, crystal–liquid duality, and fundamental optical processes of MHPs are first discussed. The properties of excitons and related phenomena in MHPs are then detailed, including the exciton binding energy determined by various methods and their influence factors, exciton dynamics, exciton–photon coupling and related applications, and exciton–phonon coupling in MHPs. The properties of photogenerated free charge carriers in MHPs such as the carrier diffusion length, mobility, and recombination are described. Recent progress in various applications is also demonstrated. Finally, a conclusion and perspectives of future studies for MHPs are presented. The properties of excitons and photogenerated charge carriers in metal halide perovskites (MHPs) are explored. The properties of excitons including the exciton binding energy, exciton dynamics, and exciton–photon and exciton–phonon coupling, are discussed. The properties of photogenerated free charge carriers in MHPs such as diffusion length, mobility, and recombination are described. A brief review of recent applications is also demonstrated.