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http://hdl.handle.net/10397/90940
Title: | 2D WSe₂ flakes for synergistic modulation of grain growth and charge transfer in Tin-based perovskite solar cells | Authors: | Wang, T Zheng, F Tang, G Cao, J You, P Zhao, J Yan, F |
Issue Date: | Jun-2021 | Source: | Advanced science, 9 June 2021, v. 8, no. 11, 2004315 | Abstract: | Tin (Sn)-based perovskites with favorable optoelectronic properties and ideal bandgaps have emerged as promising alternatives to toxic lead (Pb)-based perovskites for photovoltaic applications. However, it is challenging to obtain high-quality Sn-based perovskite films by solution process. Here, liquid-exfoliated 2D transition-metal dichalcogenides (i.e., MoS2, WS2, and WSe2) with smooth and defect-free surfaces are applied as growth templates for spin-coated FASnI3 perovskite films, leading to van der Waals epitaxial growth of perovskite grains with a growth orientation along (100). The authors find that WSe2 has better energy alignment with FASnI3 than MoS2 and WS2 and results in a cascade band structure in resultant perovskite solar cells (PSCs), which can facilitate hole extraction and suppress interfacial charge recombination in the devices. The WSe2-modified PSCs show a power conversion efficiency up to 10.47%, which is among the highest efficiency of FASnI3-based PSCs. The appealing solution phase epitaxial growth of FASnI3 perovskite on 2D WSe2 flakes is expected to find broad applications in optoelectronic devices. | Keywords: | 2D transition-metal dichalcogenides Charge transfer Grain growth Tin-based perovskite solar cells WSe2 |
Publisher: | Wiley-VCH | Journal: | Advanced science | ISSN: | 2198-3844 | DOI: | 10.1002/advs.202004315 | Rights: | ©2021 The Authors. Advanced Science published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited. The following publication Wang, T., Zheng, F., Tang, G., Cao, J., You, P., Zhao, J., Yan, F., 2D WSe2 Flakes for Synergistic Modulation of Grain Growth and Charge Transfer in Tin-Based Perovskite Solar Cells. Adv. Sci. 2021, 8, 2004315 is available at https://doi.org/10.1002/advs.202004315 |
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