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Your search keyword '"Mathews, Nripan"' showing total 14 results
Start Over Author "Mathews, Nripan" Journal nature communications
14 results on '"Mathews, Nripan"'

13. Ultrafast long-range spin-funneling in solution-processed Ruddlesden–Popper halide perovskites.

Author

Lim, Swee Sien, Righetto, Marcello, Zhang, Qiannan, Sum, Tze Chien, Giovanni, David, Lim, Jia Wei Melvin, Dewi, Herlina Arianita, Mhaisalkar, Subodh Gautam, Mathews, Nripan, Yuan, Zhongcheng, Qing, Jian, and Gao, Feng

Subjects
HALIDES, PEROVSKITE, SPINTRONICS, SEMICONDUCTOR devices, ENERGY transfer
Abstract

Room-temperature spin-based electronics is the vision of spintronics. Presently, there are few suitable material systems. Herein, we reveal that solution-processed mixed-phase Ruddlesden–Popper perovskite thin-films transcend the challenges of phonon momentum-scattering that limits spin-transfer in conventional semiconductors. This highly disordered system exhibits a remarkable efficient ultrafast funneling of photoexcited spin-polarized excitons from two-dimensional (2D) to three-dimensional (3D) phases at room temperature. We attribute this efficient exciton relaxation pathway towards the lower energy states to originate from the energy transfer mediated by intermediate states. This process bypasses the omnipresent phonon momentum-scattering in typical semiconductors with stringent band dispersion, which causes the loss of spin information during thermalization. Film engineering using graded 2D/3D perovskites allows unidirectional out-of-plane spin-funneling over a thickness of ~600 nm. Our findings reveal an intriguing family of solution-processed perovskites with extraordinary spin-preserving energy transport properties that could reinvigorate the concepts of spin-information transfer. Spin-information transport or transfer is essential for spintronics applications and often relies on high purity and quality materials. Here, the authors report on the defect-tolerant solution-processed Ruddlesden–Popper halide perovskites, where a spin propagation length of 600 nm was achieved via spin funneling. [ABSTRACT FROM AUTHOR]

Published
2019
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