Hydrogen-like Wannier–Mott Excitons in Single Crystal of Methylammonium Lead Bromide Perovskite,ACS Nano

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Hydrogen-like Wannier–Mott Excitons in Single Crystal of Methylammonium Lead Bromide Perovskite
ACS Nano ( IF 15.8 ) Pub Date : 2016-06-06 00:00:00 , DOI: 10.1021/acsnano.6b02734
Jenya Tilchin ₁ , Dmitry N Dirin _{2,

3} , Georgy I Maikov ₁ , Aldona Sashchiuk ₁ , Maksym V Kovalenko _{2,

3} , Efrat Lifshitz ₁

Affiliation

A thorough investigation of exciton properties in bulk CH₃NH₃PbBr₃ perovskite single crystals was carried out by recording the reflectance, steady-state and transient photoluminescence spectra of submicron volumes across the crystal. The study included an examination of the spectra profiles at various temperatures and laser excitation fluencies. The results resolved the first and second hydrogen-like Wannier–Mott exciton transitions at low temperatures, from which the ground-state exciton’s binding energy of 15.33 meV and Bohr radius of ∼4.38 nm were derived. Furthermore, the photoluminescence temperature dependence suggested dominance of delayed exciton emission at elevated temperatures, originating from detrapping of carriers from shallow traps or/and from retrapping of electron–hole pairs into exciton states. The study revealed knowledge about several currently controversial issues that have an impact on functionality of perovskite materials in optoelectronic devices.

中文翻译：

甲基铵溴化铅钙钛矿单晶中的类氢万尼尔-莫特激子

对大量 CH ₃ NH ₃ PbBr ₃中激子特性的彻底研究钙钛矿单晶是通过记录整个晶体的亚微米体积的反射率、稳态和瞬态光致发光光谱来进行的。该研究包括检查不同温度下的光谱分布和激光激发流。结果解决了低温下第一次和第二次类似氢的 Wannier-Mott 激子跃迁，从中推导出 15.33 meV 的基态激子结合能和 ~4.38 nm 的玻尔半径。此外，光致发光温度依赖性表明在升高的温度下延迟激子发射占主导地位，这源于载流子从浅陷阱中脱离或/和电子 - 空穴对重新捕获到激子态。

更新日期：2016-06-06

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