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Bidentate Ligand-Induced Oriented Transformation of CsPbBr3 Perovskite Nanocrystals into Nanowires for X-ray Photodetectors
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2022-03-29 , DOI: 10.1021/acsanm.2c00642
Chunyu Zhao 1 , Zaozhen He 1 , Peihua Wangyang 2 , Jie Tan 2 , Chengyu Shi 1 , Aizhao Pan 1 , Ling He 1 , Yi Liu 3
Affiliation  

Shape and dimensionality control by ligands is an efficient way to fabricate high-quality perovskite nanocrystals (NCs) with optoelectronic properties. Herein, to realize oriented transformations between different morphologies of CsPbBr3 nanocrystals, we conceived of the use of defects and bidentate ligands to synergistically drive the reorientation of CsPbBr3 nanocrystals into CsPbBr3 nanowires (NWs). By employing aminocaproic acid as the bidentate ligand, CsPbBr3 NWs were reconstructed from the CsPbBr3 NCs (∼7 nm) with 20–60 nm in width and several micrometers in length, as well as a 527 nm photoluminescence (PL) peak, 59% PL quantum yield, and 98.5 ns PL lifetime. The bidentate ligand-directed anisotropic shape evolution and growth of perovskite NWs from NCs was elucidated by transmission electronmicroscopy and PL studies. The photodetectors fabricated with the reconstructed CsPbBr3 NWs displayed a photocurrent enhancement (2.75 × 10–11 A) compared with that of the devices based on solution-synthesized NWs (2.28 × 10–11 A). The device also showed a short response time, indicating its more sensitive photoelectric response. This process provides a viable approach to engineering diverse morphologies of perovskite nanocrystals for optoelectronic applications.

中文翻译:

双齿配体诱导的 CsPbBr3 钙钛矿纳米晶体向 X 射线光电探测器纳米线的定向转化

通过配体控制形状和尺寸是制造具有光电特性的高质量钙钛矿纳米晶体(NC)的有效方法。在此,为了实现不同形态的CsPbBr 3纳米晶体之间的定向转变,我们设想使用缺陷和双齿配体协同驱动CsPbBr 3 纳米晶体重新取向为CsPbBr 3纳米线(NW)。通过使用氨基己酸作为二齿配体,从 CsPbBr 3重建 CsPbBr 3 NWsNC(~7 nm),宽度为 20-60 nm,长度为几微米,具有 527 nm 的光致发光(PL)峰,59% 的 PL 量子产率和 98.5 ns 的 PL 寿命。通过透射电子显微镜和 PL 研究阐明了来自 NC 的钙钛矿 NW 的双齿配体定向的各向异性形状演化和生长。与基于溶液合成 NW 的器件 (2.28 × 10 –11 A) 相比,用重建的 CsPbBr 3 NWs 制造的光电探测器显示出光电流增强 (2.75 × 10 –11 A)。该器件还表现出较短的响应时间,表明其光电响应更为灵敏。该过程提供了一种可行的方法来设计用于光电应用的钙钛矿纳米晶体的不同形态。
更新日期:2022-03-29
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