Multiple excitons dynamics of lead halide perovskite

Wanxiao Gao,Yaoyao Qi,Zhenxu Bai,Jie Ding,Zhiwei Lv,Yulei Wang

doi:10.1515/nanoph-2021-0411

Abstract

Abstract The lead halide perovskite material shows its unique photoelectric properties, the resulting conversion efficiency of perovskite solar cells. However, the efficiency comes to a bottleneck owing to that mechanism research fall behind the device research. Multiple excitons dynamics play an important role, especially in the lifetime and binding energy of multiple excitons. A long multiexciton lifetime is beneficial to the application for light-emitting devices and photovoltaic devices. Large multiexciton binding energy means a large Stokes shift in exciton absorption, thus avoiding the loss of linear absorption. To conclude, discussions are presented regarding views of current multiple excitons research in terms of the biexciton lifetime and biexciton binding energy that should be considered for further advances in materials and devices.

Highlights

Lead halide perovskite materials with high quantum efficiency [1], high carrier mobility [2], electronic band gapIn light-emitting technology, such as the light-emitting diode (LED) of the display, the emission color purity is very important
Discussions are presented regarding views of current multiple excitons research in terms of the biexciton lifetime and biexciton binding energy that should be considered for further advances in materials and devices
Material properties can be modified through interfaces, modified device architectures, and physical constraints on the size of photoactive materials [21,22,23]. One such process utilized by physical constraints of light-absorbing materials is the multiple exciton generation process [24]

Summary

Introduction

Lead halide perovskite materials with high quantum efficiency [1], high carrier mobility [2], electronic band gap. The study of the lifetime of multiple excitons is very important for the application potential of perovskite nanocomposites [17,18,19]. Material properties can be modified through interfaces, modified device architectures, and physical constraints on the size of photoactive materials [21,22,23] One such process utilized by physical constraints of light-absorbing materials is the multiple exciton generation process [24]. Perovskite materials can exhibit a variety of exciton species, including biexciton and triple exciton [25], the dynamics process of these multiple excitons play an important role in understanding the multibody effect of lead halide perovskite, the power conversion efficiency of photovoltaic devices can be improved by the. If the lifetime of multiple excitons is short, it means that the multiple exciton binding energy is low, the multiple excitons are unstable, which is not conducive to the application of lead halide perovskite materials

Study of multiple excitons

Biexciton lifetime

Findings

Biexciton binding energy