期刊
ADVANCED MATERIALS
卷 32, 期 40, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202001878
关键词
alkali-substitution; double perovskites; electron-phonon coupling; photophysical properties; X-ray response
类别
资金
- Research Foundation-Flanders (FWO) [G.0962.13, 1203719N, 12Y6418N, G098319N, 1514220N]
- Flemish government through long-term structural funding Methusalem (CASAS2) [Meth/15/04]
- Hercules Foundation [HER/11/14]
- Belgian Federal Science Policy Office [IAP-PH05]
- KU Leuven [C14/19/079]
- EC through the Marie Curie ITN project iSwitch [GA-642196]
- HFML-RU/FOM
- Danish Council for Independent Research under the Sapere Aude program [7027-00077B]
- VILLUM FONDEN via the Centre of Excellence for Dirac Materials [11744]
- German Science Foundation [KU 3287/1-1]
- Projekt DEAL
Lead-free double perovskites have great potential as stable and nontoxic optoelectronic materials. Recently, Cs(2)AgBiBr(6)has emerged as a promising material, with suboptimal photon-to-charge carrier conversion efficiency, yet well suited for high-energy photon-detection applications. Here, the optoelectronic and structural properties of pure Cs(2)AgBiBr(6)and alkali-metal-substituted (Cs1-xYx)(2)AgBiBr6(Y: Rb+, K+, Na+;x = 0.02) single crystals are investigated. Strikingly, alkali-substitution entails a tunability to the material system in its response to X-rays and structural properties that is most strongly revealed in Rb-substituted compounds whose X-ray sensitivity outperforms other double-perovskite-based devices reported. While the fundamental nature and magnitude of the bandgap remains unchanged, the alkali-substituted materials exhibit a threefold boost in their fundamental carrier recombination lifetime at room temperature. Moreover, an enhanced electron-acoustic phonon scattering is found compared to Cs2AgBiBr6. The study thus paves the way for employing cation substitution to tune the properties of double perovskites toward a new material platform for optoelectronics.
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