alpha-CsPbI3 Nanocrystals by Ultraviolet Light-Driven Oriented Attachment.
alpha-CsPbI3 Nanocrystals by Ultraviolet Light-Driven Oriented Attachment.
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紫外光驱动定向附件的 α-CsPbI3 纳米晶体。
DOI：
10.1021/acs.jpclett.9b03367
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发表时间：
2020
影响因子：
5.7
通讯作者：
Wang Xi
中科院分区：
文献类型：
--
作者：
Pan Lu;Ye Tao;Qin Changdong;Zhou Bo;Lei Nuo;Chen Shuang;Yan Pengfei;Wang Xi
钙钛矿层中建筑单元的尺寸和结晶度对光伏性能具有重要意义。因此，制备具有良好结晶度的大晶粒钙钛矿材料是十分必要的。定向附着策略是一种有效的控制晶体生长的方法。在此，我们报道了α- cspbi3量子点（QDs）在中紫外光（UV）下定向附着在大晶粒纳米晶体上。利用原子分辨率TEM和x射线吸收精细结构（XAFS）光谱，观察了紫外定向结构演化和生长过程。这是由紫外线照射（7w, 365 nm）触发的，它驱动量子点的定向组装成沿{110}面的大纳米颗粒。此外，我们还观察了α-CsPbI3QDs在高功率紫外线（100 W, 365 nm）照射下，从光失活性-δ相到最终变成pbi2的损伤过程。这一发现为制造具有良好性能的大尺寸钙钛矿纳米结构提供了一个原型。
Size and crystallinity of building units in the perovskite layer are of great significance to photovoltaic performance. Thus, to fabricate large-grain-size perovskite materials with the advantage of good crystallinity is quite necessary. The oriented attachment strategy has been proofed as an efficient method to control crystal growth. Herein, we reported on oriented attachment of α-CsPbI3quantum dots (QDs) into a large-grain-size nanocrystal under moderate ultraviolet (UV) light. By virtue of atomic-resolution TEM and X-ray absorption fine structure (XAFS) spectroscopy, we observed the UV-directed structure-evolution and growth process. This is trigged by UV-light illumination (7 W, 365 nm), which drives the oriented assembly of QDs into a large nanoparticle along {110} facets. Moreover, we also visualized a damage process of the α-CsPbI3QDs to photoinactive-δ-phase ones and finally into PbI2under high-power UV-light (100 W, 365 nm) exposure. The findings provide a prototype for fabricating large-size perovskite nanostructures with promising properties.