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• W4366742623 abstract "Charge-transport layers are essential for achieving electrically pumped perovskite lasers. However, their role in perovskite lasing is not fully understood. Here, the role of charge-transport layers on the lasing actions of perovskite films is explored by investigating the amplified spontaneous emission (ASE) thresholds. A largely reduced ASE threshold and enhanced ASE intensity is demonstrated by introducing an additional hole transport layer poly(triaryl amine) (PTAA). It is shown that the key role of the PTAA layer is to accelerate the hot-carrier cooling process by extracting holes in perovskites. With reduced hot holes, the Auger recombination loss is largely suppressed, resulting in decreased ASE threshold. This argument is further supported by the fact that the ASE threshold can be further reduced from 25.7 to 7.2 µJ cm-2 upon switching the pumping wavelength from 400 to 500 nm to directly avoid excess hot-hole generation. This work exemplifies how to further reduce the ASE threshold with transport layer engineering through hot-hole manipulation. This is critical to maintaining the excellent gain properties of perovskites when integrating them into electrical devices, paving the way for electrically pumped perovskite lasers." @default.
• W4366742623 created "2023-04-24" @default.
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• W4366742623 date "2023-06-11" @default.
• W4366742623 modified "2023-10-17" @default.
• W4366742623 title "Transport Layer Engineering Toward Lower Threshold for Perovskite Lasers" @default.
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• W4366742623 doi "https://doi.org/10.1002/adma.202300922" @default.
• W4366742623 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37086205" @default.
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