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Younis, Adnan; Hu, Long; Sharma, Pankaj; Lin, Chun‐Ho; Mi, Yang; Guan, Xinwei; Zhang, Dawei; Wang, Yutao; He, Tengyue; Liu, Xinfeng; Shabbir, Babar; Huang, Shujuan; Seidel, Jan; Wu, Tom
Advanced functional materials, 08/2020, Letnik: 30, Številka: 31Journal Article
Hybrid organic‐inorganic halide perovskites are actively pursued for optoelectronic technologies, but the poor stability is the Achilles’ heel of these materials that hinders their applications. Very recently, it has been shown that lead sulfide (PbS) quantum dots (QDs) can form epitaxial interfaces with the perovskite matrix and enhance the overall stability. In this work, it is demonstrated that embedding QDs can significantly modify the transport property of pristine perovskite single crystals, endowing them with new functionalities besides being structurally robust and free from grain boundaries. Resistive switching memory devices are constructed using solution‐processed CH3NH3PbBr3 (MAPbBr3) perovskite single crystals and the QD‐embedded counterparts. It is found that QDs could significantly enhance the charge transport and reduce the current–voltage hysteresis. The pristine singe crystal device exhibits negative differential resistance, while the QD‐embedded crystals are featured with filament‐type switching behavior and much improved device stability. This study underscores the potential of QD‐embedded hybrid perovskites as a new media for advanced electronic devices. Embedding PbS quantum dots into CH3NH3PbBr3 single crystals can significantly enhance resistive switching performance and ambient stability. In general, such perovskite/quantum dot heterostructures exhibit improved charge transport property and reduced current–voltage hysteresis, suggesting the potential for advanced optoelectronics.
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in: SICRIS
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