Narrow Linewidth Excitonic Emission in Organic–Inorganic Lead Iodide Perovskite Single Crystals

详细信息    查看全文

• 作者：Hiba Diab ; Gaëlle Trippé-Allard ; Ferdinand Lédée ; Khaoula Jemli ; Christèle Vilar ; Guillaume Bouchez ; Vincent L.R. Jacques ; Antonio Tejeda ; Jacky Even ; Jean-Sébastien Lauret ; Emmanuelle Deleporte ; Damien Garrot
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2016
• 出版时间：December 15, 2016
• 年：2016
• 卷：7
• 期：24
• 页码：5093-5100
• 全文大小：495K
• ISSN：1948-7185

文摘

Hybrid perovskite thin films have demonstrated impressive performance for solar energy conversion and optoelectronic applications. However, further progress will benefit from a better knowledge of the intrinsic photophysics of materials. Here, the temperature-dependent emission properties of CH₃NH₃PbI₃ single crystals are investigated and compared to those of thin polycrystalline films by means of steady-state and time-resolved photoluminescence spectroscopy. Single crystals photoluminescence present a sharp excitonic emission at high energy, with full width at half maximum of only 5 meV, assigned to free excitonic recombination. We highlight a strong thermal broadening of the free excitonic emission, due to exciton–LO-phonon coupling. The emission turned to be very short-lived with a subnanosecond dynamics, mainly induced by the fast trapping of the excitons. The free excitonic emission is completely absent of the thin film spectra, which are dominated by trap state bands.