Analysis of ultrafast carrier dynamics and steady-state reflectivity on lattice expansion in metal halide perovskite during continuous illumination
Analysis of ultrafast carrier dynamics and steady-state reflectivity on lattice expansion in metal halide perovskite during continuous illumination
复制标题
连续照明期间金属卤化物钙钛矿晶格膨胀的超快载流子动力学和稳态反射率分析
DOI：
10.1063/5.0098129
复制
发表时间：
2022
影响因子：
3.2
通讯作者：
Shi-Bing Liu
中科院分区：
文献类型：
--
作者：
Ya-Chao Li;Chao Ge;Hai-Ying Song;Peng Wang;Xiao-Ran Ma;Shi-Bing Liu
混合卤化物钙钛矿的晶格膨胀直接影响其光电性能和钙钛矿基光电器件的稳定性，并与相关的诱导机制密切相关。从载流子弛豫动力学和介电性质的角度来看，我们报告了采用超快时间分辨瞬态和稳态反射率技术来诊断体混合钙钛矿MAPbI中发生的晶格膨胀的结果[公式：分别在连续照射和直接加热期间见正文。在恒定温度下连续光照时，MAPbI[式：见]中没有明显的结构变化，但在自然温度变化的条件下，连续光照可以诱导晶格膨胀，并且与热诱导膨胀的效果一致。本结果是基于晶格膨胀引起的电子结构变化导致MAPbI[式：见正文]介电性质变化并进而导致光反射率变化的物理机制。
Lattice expansion in hybrid halide perovskite directly affects its photoelectric properties and the stability of perovskite-based optoelectronic devices, which was certified also to closely connect with relevant inducing mechanisms. From the perspective of carrier relaxation dynamics and dielectric properties, we report the results employing ultrafast time-resolved transient and steady-state reflectivity technology to diagnose the lattice expansion occurring in bulk hybrid perovskite MAPbI[Formula: see text during continuous illumination and directly heating, respectively. Upon continuous illumination at a constant temperature, there were no evident structural changes in MAPbI[Formula: see but in the condition of naturally temperature changes, the lattice expansion can be induced by continuous light illumination and is consistent with the effect of heat-inducted expansion. The present results are based on the physical mechanism that the change of the electronic structure caused by lattice expansion leads to the change of the dielectric properties in MAPbI[Formula: see text and sequentially to the change of light reflectivity.