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Thiophene-based Two-Dimensional Dion-Jacobson Perovskite Solar Cells with over 15% Efficiency.

著者 Lu D , Lv G , Xu Z , Dong Y , Ji X , Liu Y
J Am Chem Soc.2020 Jun 01 ; ():.
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Two-dimensional (2D) perovskites are emerging photovoltaic materials because of their highly tunable photophysical proper-ties and improved environmental stability in comparison with 3D perovskites. Here, a thiophene-based bulky dication spacer, namely 2,5-thiophenedimethylammonium (ThDMA), was developed and applicated in 2D Dion-Jacobson (DJ) perovskite. High quality 2D DJ perovskite, (ThDMA)MAn-1PbnI3n+1 (nominal n = 5), with improved crystallinity, preferred vertical orienta-tion and enlarged spatially resolved carrier lifetime could be achieved by one-step method using mixed solvent of DMF/DMSO (v:v, 9:1). The optimized device exhibits a high efficiency of 15.75%, which is a record for aromatic spacer-based 2D DJ perov-skite solar cells (PSCs). Moreover, the unencapsulated 2D DJ perovskite devices sustained over 95% of its original efficiency after storage in N2 for 1655 h. Importantly, both the light soaking stability and thermal stability (T = 80 oC) of the 2D DJ perovksite devices are dramatically improved in comparison with their 3D counterparts. These results indicate that highly effi-cient and stable 2D DJ PSCs could be achieved by developing thiophene-based aromatic spacers as well as device engineering.
PMID: 32478512 [PubMed - as supplied by publisher]
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