6/7/2023 0 Comments Total annihilation show ranges![]() The exciton diffusion constant is found to increase with quantum-well thickness, ranging from 0.06 ± 0.03 to 0.34 ± 0.03 cm 2 s −1, which leads to long-range exciton diffusion over hundreds of nanometers. Here we employ transient absorption microscopy to disentangle quantum-well-thickness-dependent exciton diffusion and annihilation in two-dimensional perovskites, unraveling the key role of electron-hole interactions and dielectric screening. Exciton transport and annihilation are two key processes in determining device efficiencies however, a thorough understanding of these processes is hindered by that annihilation rates are often convoluted with exciton diffusion constants. Two-dimensional hybrid organic-inorganic perovskites with strongly bound excitons and tunable structures are desirable for optoelectronic applications.
0 Comments
Leave a Reply. |