论文标题
从发射光谱的Urbach尾部的卤化物钙壶中的载体热化和零点的带隙重新归一化
Carrier thermalization and zero-point bandgap renormalization in halide perovskites from the Urbach tails of the emission spectrum
论文作者
论文摘要
我们开发了研究温度依赖性定位，热化和声子散射对卤化物钙钛矿中激素的影响，从发射光谱的分析中。当从温度依赖性发光光谱的低能尾部推断出激素的Urbach边缘，被证明对电子分布和热化敏感。一种观察乌尔巴赫焦点的方法是为卤化物钙壶的设计，其中激素间隙的温度依赖性是异常的。零点带隙重归其化的值被推断为约33 meV。带隙重归其化的小价值排除了小极性子的形成，并指出了弱电子耦合。实验是在原型卤化物钙钛矿的纳米片上进行的，CSPBBR $ _3 $。
We develop techniques to study the temperature dependent localization, thermalization, and the effects of phonon scattering on the excitons in halide perovskites from the analysis of the emission spectra. The excitonic Urbach edge, when inferred from the low energy tails of the temperature dependent luminescence spectra, is shown to be sensitive to the electron distribution and thermalization. A method to observe the Urbach focus is devised for halide perovskites where the temperature dependence of the excitonic gap is anomalous. The value of the zero-point bandgap renormalization is inferred to be about 33 meV. This small value of the bandgap renormalization rules out the formation of small polarons and points to weak electron-phonon coupling. The experiments are performed on the nanosheets of the archetypal halide perovskite, CsPbBr$_3$.
