One-Stone-for-Multiple-Birds Additive Strategy for Highly Efficient and Stable Carbon-Based Hole-Transport-Layer-Free CsPbI 2 Br Solar Cells.

Autor: Li W; LONGi Institute of Future Technology, and School of Materials & Energy, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, China., Tong H; LONGi Institute of Future Technology, and School of Materials & Energy, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, China.; LONGi Central R&D Institute, LONGi Green Energy Technology Co., Ltd, Xi'an, Shaanxi, 710000, China., Li Y; LONGi Institute of Future Technology, and School of Materials & Energy, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, China., Liu X; LONGi Institute of Future Technology, and School of Materials & Energy, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, China., Wan G; LONGi Institute of Future Technology, and School of Materials & Energy, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, China., Ma X; LONGi Institute of Future Technology, and School of Materials & Energy, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, China., Liu H; LONGi Institute of Future Technology, and School of Materials & Energy, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, China., Gao Z; LONGi Institute of Future Technology, and School of Materials & Energy, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, China., Fu Y; LONGi Institute of Future Technology, and School of Materials & Energy, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, China., He D; LONGi Institute of Future Technology, and School of Materials & Energy, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, China., Li Z; LONGi Institute of Future Technology, and School of Materials & Energy, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, China.; LONGi Central R&D Institute, LONGi Green Energy Technology Co., Ltd, Xi'an, Shaanxi, 710000, China., Li J; LONGi Institute of Future Technology, and School of Materials & Energy, Lanzhou University, 222 South Tianshui Road, Lanzhou, 730000, China.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Oct 14, pp. e2406784. Date of Electronic Publication: 2024 Oct 14.
DOI: 10.1002/smll.202406784
Abstrakt: During fabrication and operation of perovskite solar cells (PSCs), defects commonly arise within the crystals as well as at grain boundaries. However, conventional additive strategies typically only serve to mitigate the occurrence of a single defect and fail to significantly enhance device performance. Herein, carbon-based hole-transport-layer-free CsPbI 2 Br devices are focused on, one kind of important PSCs with more stable structure and an appropriate bandgap for a semitransparent solar cell or a top cell in a tandem configuration, and present a highly efficient one-stone-for-multiple-birds additive strategy based on lanthanide trifluoromethanesulfonates (Ln(OTF) 3 , Ln: neodymium (Nd), europium (Eu), dysprosium (Dy), thulium (Tm)). Density functional theory calculations reveal that the Ln 3+ ions with a smaller radius can elevate defect formation energy for Pb and I vacancies within the crystals, while the presence of OTF - can effectively passivating uncoordinated Pb 2+ at grain boundaries. In addition, Ln(OTF) 3 addition increases the grain size and meanwhile reduces the surface roughness of the CsPbI 2 Br layers. All these positive contributions lead to a significant enhancement in power conversion efficiency (PCE) to 15.13% which is among the top PCEs reported for the corresponding solar cells, from 11.80% of the pristine device without Tm(OTF) 3 addition, while notably boosting long-term stability and reducing current-voltage hysteresis.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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