Abnormal spatial heterogeneity governing the charge-carrier mechanism in efficient Ruddlesden?Popper perovskite solar cells

Title
Abnormal spatial heterogeneity governing the charge-carrier mechanism in efficient Ruddlesden?Popper perovskite solar cells
Authors
김지영Jun Xi변준섭김운수방기준한기림윤정진Hua DongZhaoxin WuGiorgio DivitiniKai Xi박진우이태우최만수이종우Seong Keun Kim
Issue Date
2021-07
Publisher
Energy & environmental science
Citation
VOL 온라인게재, 온라인게재
Abstract
Layered Ruddlesden?Popper perovskite (RPP) photovoltaics have gained substantial attention owing to their excellent air stability. However, their photovoltaic performance is still limited by the unclear real-time charge-carrier mechanism of operating devices. Herein, we report the correlation between the charge-carrier mechanism and the spatially heterogeneous RPP bulks induced by distinct sublattice cations in the state-of-the-art antisolvent-driven RPP devices. In particular, abnormal heterogeneities ranging from the lateral long-range to local sub-grain scale and corresponding charge-carrier behaviours are visualized for triple-cation RPPs. We discovered that such heterogeneities with a unitary 2D/3D hybrid suppress lattice vibrations and reduce Fr?hlich interactions by about 2 times, significantly promoting charge-carrier dynamics. Consequently, optimized triple-cation RPP solar cells greatly outperform their mono-cation counterparts. Furthermore, this principle can be applicable irrespective of 2D layer thickness (n > 2) and substrate type. This work provides a rationale for leveraging a disordered structure to stimulate charge-carrier motion and suggests the design principle of low-dimensional perovskites.
URI
http://pubs.kist.re.kr/handle/201004/73595
ISSN
1754-5692
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KIST Publication > Article
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