期刊
ACS ENERGY LETTERS
卷 5, 期 2, 页码 559-565出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b02781
关键词
-
类别
资金
- International Max Planck Research School (IMPRS) for Interface Controlled Materials for Energy Conversion (SurMat)
- European Union via the Leitmarktwettbewerb NRW: Neue Werkstoffe, within the PeroBOOST project [EFRE-0800120, NW-1-1-040h]
The lead-free double perovskite Cs2AgBiX6 (X = Br, Cl) has recently demonstrated great potential for applications in solar cells, photodetectors, and X-ray detectors. This material is characterized by a dominant resonant absorption feature in the UV-blue spectral region, which is still under controversial discussion regarding its origin. Here, we uncover an electronic fine structure of this optical feature in Cs2AgBiBr6 thin films. A detailed temperature-resolved study combining photoluminescence (PL), photoluminescence excitation (PLE), and absorption spectroscopy reveals the existence of three optical transitions, situated approximately 100 meV around the resonance at 2.83 eV. PL measurements under pulsed excitation uncover a short-lived blue emission at the absorption resonance energy that persists up to room temperature and indicates the competition of direct emission from the resonant state and fast relaxation into the red emissive ground state. We derive a comprehensive energy scheme and suggest possible mechanisms leading to the observed fine structure splitting.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据