Harnessing of Spatially Confined Perovskite Nanocrystals Using Polysaccharide-based Block Copolymer Systems
journal contributionposted on 23.06.2022, 21:29 authored by Chih-Chien Hung, Yan-Cheng Lin, Tsung-Han Chuang, Yun-Chi Chiang, Yu-Cheng Chiu, Muhammad Mumtaz, Redouane Borsali, Wen-Chang Chen
Metal halide perovskite nanocrystals (PVSK NCs) are generally unstable upon their transfer from colloidal dispersions to thin film devices. This has been a major obstacle limiting their widespread application. In this study, we proposed a new approach to maintain their exceptional optoelectronic properties during this transfer by dispersing brightly emitting cesium lead halide PVSK NCs in polysaccharide-based maltoheptaose-block-polyisoprene-block-maltoheptaose (MH-b-PI-b-MH) triblock copolymer (BCP) matrices. Instantaneous crystallization of ion precursors with favorable coordination to the sugar (maltoheptaose) domains produced ordered NCs with varied nanostructures of controlled domain size (≈10–20 nm). Confining highly ordered and low dimension PVSK NCs in polysaccharide-based BCPs constituted a powerful tool to control the self-assembly of BCPs and PVSK NCs into predictable structures. Consequently, the hybrid thin films exhibited excellent durability to humidity and stretchability with a relatively high PL intensity and photoluminescence quantum yield (>70%). Furthermore, stretchable phototransistor memory devices were produced and maintained with a good memory ratio of 105 and exhibited a long-term memory retention over 104 s at a high strain of 100%.
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thin film devicesterm memory retentionmajor obstacle limitinggood memory ratiogenerally unstable uponexceptional optoelectronic propertiesconfining highly ordered>- polyisoprene -<>- pi -<based bcps constituted5 </ sup4 </ supbased maltoheptaose -<mh -<block </b </>- mh>- maltoheptaosewidespread applicationvaried nanostructurestriblock copolymerpvsk ncspredictable structurespowerful toolnew approachion precursorsinstantaneous crystallizationhigh strainfavorable coordinationcolloidal dispersions100 %.