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Hot carrier photovoltaics in van der Waals heterostructures

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Title
Hot carrier photovoltaics in van der Waals heterostructures
Author(s)
Kamal Kumar Paul; Ji- Hee Kim; Young Hee Lee
Publication Date
2021-03
Journal
NATURE REVIEWS PHYSICS, v.3, no.3, pp.178 - 192
Publisher
SPRINGERNATURE
Abstract
Successfully designing an ideal solar cell requires an understanding of the fundamental physics of photoexcited hot carriers (HCs) and the underlying mechanism of unique photovoltaic performance. Harnessing photoexcited HCs offers the potential to exceed the thermodynamic limit of power conversion efficiency, although major loss channels employing ultrafast thermalization of HCs severely restrict their utilization in conventional bulk-absorber-based solar cells. Spatially confined semiconductors, especially 2D van der Waals (vdW) materials, offer several advantages, such as strong Coulomb interaction, high exciton binding energy, strong carrier-carrier scattering and weak carrier-phonon coupling, resulting in slow HC cooling and restricted loss channels. This Review provides a detailed mechanistic understanding of the HC cooling dynamics in confined vdW layered materials for efficiently utilizing HCs and discusses the role of carrier multiplication in designing a solar cell with the power conversion efficiency exceeding the Shockley-Queisser limit. Additionally, we analyse the major energy loss channels that limit the efficiency of a conventional solar cell, as well as the promises held by the 2D vdW heterostructures for an efficient HC solar cell. Furthermore, we highlight the challenges and opportunities involved in successfully utilizing HCs in practical solar cells with efficiencies beyond the thermodynamic limit.
URI
https://pr.ibs.re.kr/handle/8788114/9483
DOI
10.1038/s42254-020-00272-4
ISSN
2522-5820
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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