...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Screening Links Transport and Recombination Mechanisms in Lead Halide Perovskites
【24h】

Screening Links Transport and Recombination Mechanisms in Lead Halide Perovskites

机译：筛选卤化铅钙铅中的链路运输和重组机制

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Excitation-fluence-dependent charge carrier transport and decay dynamics in individual lead bromide perovskite microcrystals were studied using time-resolved pump-probe microscopy. Measurements show that, in contrast to MAPbI(3), diffusion in both CsPbBr3 and MAPbBr(3) decreases for carrier densities that exceed similar to 10(18) cm(-3). Fits to the carrier-carrier scattering rate in CsPbBr3 and MAPbBr(3) indicate that the Coulomb interaction between mobile charges is mediated by an effective dielectric of epsilon = 11.53 +/- 2.23 for CsPbBr3 and epsilon = 13.01 +/- 1.76 for MAPbBr(3), values which are a factor of 2-10 lower than reported values of the static dielectric. Excited state decay kinetics, again collected on individual microcrystalline domains, are consistent with a lower effective dielectric for bromide perovskites relative to iodide perovskites. Nonlinear carrier recombination (2nd order and Auger processes) in CsPbBr3 and MAPbBr(3) scale more strongly with excitation density than in MAPbI(3). Together, these results indicate that low-frequency contributions to the static dielectric, such as low-frequency phonon modes and ionic mobility, have reduced effectiveness screening the rapidly moving mobile charges at room temperature.
机译：使用时间分辨泵探针显微镜研究了各种铅溴钙钛矿微晶中的激发器依赖性电荷载流子传输和衰减动力学。测量结果表明，与MAPBI（3）相比，CSPBBR3和MAPBBR（3）中的扩散对于超过10（18）厘米（-3）的载体密度降低。符合CSPBBR3和MAPBBR（3）中的载波载波散射速率，表明移动电荷之间的库仑相互作用由EPSILON的有效介质介导的CSPBBR3和EPSILON = 13.01 +/- 1.76用于MAPBBR（ 3），比静态电介质的报告值低2-10因子的值。激发状态衰变动力学再次收集在单个微晶结构域，与相对于碘化物钙钛矿的溴化溴化物钙酸盐的较低有效电介质一致。在CSPBBR3和MAPBBR（3）中的非线性载体重组（第二顺序和螺旋钻过程）比MAPBI（3）中的激发密度更强烈。这些结果表明，对静态电介质的低频贡献，例如低频声子模式和离子迁移率，在室温下筛选快速移动的移动电荷减少了效果。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号