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Synthesis of Size-Controllable Self-Assembled CsPbBr3 Perovskite Nanowires: Implications for Photoemission with Less Recombination
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2022-03-29 , DOI: 10.1021/acsanm.2c00515 Huazheng Li 1 , Wangwei Lu 1 , Gaoling Zhao 1 , Bin Song 2 , Weixia Dong 1, 3 , Gaorong Han 1
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2022-03-29 , DOI: 10.1021/acsanm.2c00515 Huazheng Li 1 , Wangwei Lu 1 , Gaoling Zhao 1 , Bin Song 2 , Weixia Dong 1, 3 , Gaorong Han 1
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CsPbBr3 perovskite nanowires (NWs) with various lengths and widths have attracted much attention because of their attractive optoelectronic properties in optoelectronic devices. This study provides an effective approach to get size-controllable CsPbBr3 perovskite NWs based on the hot injection method. Oleylamine was used as the solvent to control the reaction speed, and CsPbBr3 perovskite NWs with adjustable widths and lengths were obtained by controlling the reaction time at 180 °C. X-ray diffraction, transmission electron microscopy (TEM), high-resolution transmission electronic microscopy, optical absorption, and photoluminescence (PL) spectra were carried out to investigate the structural evolution and growth mechanism. The results show that Cs4PbBr6 nanocrystals precipitated within 10 min and their amount reduced, and α-CsPbBr3 nanocrystals appeared and grew with the reaction time extending to 30 min. Cs4PbBr6 nanocrystals disappeared, and α-CsPbBr3 NWs with a width of ∼20 nm and a length of ∼1 μm were obtained when the reaction reached 60 min. Further extending the reaction time resulted in self-assembling and growth of CsPbBr3 NWs, the width of CsPbBr3 wires reached ∼1 μm, and the length reached ∼100 μm when the reaction time was 24 h. TEM images clearly showed that CsPbBr3 NWs become wider and longer by self-assembly of CsPbBr3 nanocubes and NWs. A statistics study revealed that there is a linear relationship between the width and the reciprocal of time. The self-assembly CsPbBr3 perovskite NWs presented a high-intensity green PL around 519 nm and high PL quantum yield, which was 71.7, 76.9, 64.9, and 39.5% for the samples reacted for 10, 30, 60, and 180 min, respectively, under 375 nm laser irradiation, and the photocarrier lifetime for the sample with 180 min can reach 25.79 ns. The obtained CsPbBr3 NWs have few defects and produce less recombination during the photoemission process, which is promising for applications in the fields of optoelectronic devices, especially photodetectors, lasers, and solar cells devices.
中文翻译：
尺寸可控的自组装 CsPbBr3 钙钛矿纳米线的合成：具有较少复合的光发射的意义
具有不同长度和宽度的CsPbBr 3钙钛矿纳米线（NWs）因其在光电器件中具有吸引力的光电特性而备受关注。本研究提供了一种基于热注入法获得尺寸可控的CsPbBr 3钙钛矿纳米线的有效方法。以油胺为溶剂控制反应速度，控制反应时间在180 ℃，得到宽度和长度可调的CsPbBr 3钙钛矿纳米线。进行了X射线衍射、透射电子显微镜（TEM）、高分辨率透射电子显微镜、光吸收和光致发光（PL）光谱，以研究结构演变和生长机制。结果表明，Cs10 min内析出4个PbBr 6纳米晶且数量减少，反应时间延长至30 min，出现并生长α-CsPbBr 3纳米晶。当反应达到60 min时，Cs 4 PbBr 6纳米晶消失，得到宽约20 nm、长约1 μm的α-CsPbBr 3 NW。进一步延长反应时间导致CsPbBr 3 NWs的自组装和生长，当反应时间为24 h时，CsPbBr 3线的宽度达到~1 μm，长度达到~100 μm。TEM图像清楚地表明CsPbBr 3 NWs通过CsPbBr 3的自组装变得更宽和更长纳米立方体和 NW。一项统计研究表明，宽度与时间的倒数之间存在线性关系。自组装 CsPbBr 3钙钛矿纳米线在 519 nm 附近呈现出高强度的绿色 PL 和高 PL 量子产率，反应 10、30、60 和 180 分钟的样品分别为 71.7、76.9、64.9 和 39.5%，分别在375 nm激光照射下，180 min样品的光载流子寿命可达25.79 ns。所获得的CsPbBr 3 NWs在光电发射过程中缺陷少，复合少，有望在光电器件领域应用，特别是光电探测器、激光器和太阳能电池器件。
更新日期：2022-03-29
中文翻译：
尺寸可控的自组装 CsPbBr3 钙钛矿纳米线的合成：具有较少复合的光发射的意义
具有不同长度和宽度的CsPbBr 3钙钛矿纳米线（NWs）因其在光电器件中具有吸引力的光电特性而备受关注。本研究提供了一种基于热注入法获得尺寸可控的CsPbBr 3钙钛矿纳米线的有效方法。以油胺为溶剂控制反应速度，控制反应时间在180 ℃，得到宽度和长度可调的CsPbBr 3钙钛矿纳米线。进行了X射线衍射、透射电子显微镜（TEM）、高分辨率透射电子显微镜、光吸收和光致发光（PL）光谱，以研究结构演变和生长机制。结果表明，Cs10 min内析出4个PbBr 6纳米晶且数量减少，反应时间延长至30 min，出现并生长α-CsPbBr 3纳米晶。当反应达到60 min时，Cs 4 PbBr 6纳米晶消失，得到宽约20 nm、长约1 μm的α-CsPbBr 3 NW。进一步延长反应时间导致CsPbBr 3 NWs的自组装和生长，当反应时间为24 h时，CsPbBr 3线的宽度达到~1 μm，长度达到~100 μm。TEM图像清楚地表明CsPbBr 3 NWs通过CsPbBr 3的自组装变得更宽和更长纳米立方体和 NW。一项统计研究表明，宽度与时间的倒数之间存在线性关系。自组装 CsPbBr 3钙钛矿纳米线在 519 nm 附近呈现出高强度的绿色 PL 和高 PL 量子产率，反应 10、30、60 和 180 分钟的样品分别为 71.7、76.9、64.9 和 39.5%，分别在375 nm激光照射下，180 min样品的光载流子寿命可达25.79 ns。所获得的CsPbBr 3 NWs在光电发射过程中缺陷少，复合少，有望在光电器件领域应用，特别是光电探测器、激光器和太阳能电池器件。
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