Maeng Seongkyu, Park Sun Jae, Lee Jaehwan, Lee Hyungdoh, Choi Jonghui, Kang Jeung Ku, Cho Himchan
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291, Daehak-ro, Yuseong-gu, Daejeon, Republic of Korea.
Sci Adv. 2023 Aug 18;9(33):eadi6950. doi: 10.1126/sciadv.adi6950. Epub 2023 Aug 16.
We present a universal direct photocatalytic patterning method that can completely preserve the optical properties of perovskite nanocrystals (PeNCs) and other emissive nanomaterials. Solubility change of PeNCs is achieved mainly by a photoinduced thiol-ene click reaction between specially tailored surface ligands and a dual-role photocatalytic reagent, pentaerythritol tetrakis(3-mercaptopropionate) (PTMP), where the thiol-ene reaction is enabled at a low light intensity dose (~ 30 millijoules per square centimeter) by the strong photocatalytic activity of PeNCs. The photochemical reaction mechanism was investigated using various analyses at each patterning step. The PTMP also acts as a defect passivation agent for the PeNCs and even enhances their photoluminescence quantum yield (by ~5%) and photostability. Multicolor patterns of cesium lead halide (CsPbX)PeNCs were fabricated with high resolution (<1 micrometer). Our method is widely applicable to other classes of nanomaterials including colloidal cadmium selenide-based and indium phosphide-based quantum dots and light-emitting polymers; this generality provides a nondestructive and simple way to pattern various functional materials and devices.
我们提出了一种通用的直接光催化图案化方法，该方法可以完全保留钙钛矿纳米晶体（PeNCs）和其他发光纳米材料的光学性质。PeNCs的溶解度变化主要通过特殊定制的表面配体与双功能光催化试剂季戊四醇四（3-巯基丙酸酯）（PTMP）之间的光诱导硫醇-烯点击反应来实现，其中硫醇-烯反应通过PeNCs的强光催化活性在低光强度剂量（约每平方厘米30毫焦耳）下得以实现。在每个图案化步骤中使用各种分析方法研究了光化学反应机理。PTMP还作为PeNCs的缺陷钝化剂，甚至提高了它们的光致发光量子产率（约5%）和光稳定性。制备了高分辨率（<1微米）的卤化铯铅（CsPbX）PeNCs多色图案。我们的方法广泛适用于其他类型的纳米材料，包括基于胶体硒化镉和磷化铟的量子点以及发光聚合物；这种通用性提供了一种无损且简单的方法来图案化各种功能材料和器件。
