Abstract
Solar absorbers featuring prolonged hot-carrier (HC) cooling are highly desired for the development of HC solar cells. Two-dimensional (2D) hybrid perovskites are known for their exceptional stability and tunable optoelectronic properties. Nevertheless, their hot-carrier dynamics have been inadequately investigated. Here, we demonstrate ultraslow hot-carrier cooling with a lifetime >2 ns and long HC diffusion length in 2D (ACA)(MA)PbI4 (ACA = acetamidinium) with alternating cations in the interlayer space (ACI), surpassing those of 3D MAPbBr3 and 2D Ruddlesden–Popper (PEA)2PbI4. Our nonadiabatic molecular dynamics simulations with spin–orbit coupling show that the enhanced HC cooling in the ACI-phase 2D perovskite is due to multiple split-off bands and reduced electron–phonon coupling. Furthermore, the hot electrons can be efficiently extracted from (ACA)(MA)PbI4 and then transferred to the electron-transporting layer. These new insights highlight the benefit of manipulating interlayer cations in 2D perovskites as an advantageous approach to control long-lived hot carriers, thus potentially enhancing photovoltaic device performance.
Original language | English (US) |
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Pages (from-to) | 4315-4322 |
Number of pages | 8 |
Journal | ACS Energy Letters |
DOIs | |
State | Published - Sep 22 2023 |
Bibliographical note
KAUST Repository Item: Exported on 2023-09-26Acknowledgements: J.Y. acknowledges financial support from Hong Kong Polytechnic University (Grant no. P0042930) and a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. PolyU 25300823). M.L. acknowledges financial support from the Shenzhen Science, Technology and Innovation Commission (JCYJ20210324131806018), the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. PolyU 25301522 and PolyU 15301323), and the National Natural Science Foundation of China (22373081). Q.W. acknowledges support from the Natural Science Foundation of China (61904152). This work was also supported by King Abdullah University of Science and Technology (KAUST).