Colloidal CsPbX3 (X = Cl, Br, I) Nanocrystals 2.0: Zwitterionic Capping Ligands for Improved Durability and Stability.,ACS Energy Letters

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Colloidal CsPbX3 (X = Cl, Br, I) Nanocrystals 2.0: Zwitterionic Capping Ligands for Improved Durability and Stability.
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-02-09 , DOI: 10.1021/acsenergylett.8b00035
Franziska Krieg _{1,

2} , Stefan T Ochsenbein _{1,

2} , Sergii Yakunin _{1,

2} , Stephanie Ten Brinck ₃ , Philipp Aellen _{1,

2} , Adrian Süess _{1,

2} , Baptiste Clerc _{1,

2} , Dominic Guggisberg _{1,

2} , Olga Nazarenko _{1,

2} , Yevhen Shynkarenko _{1,

2} , Sudhir Kumar ₄ , Chih-Jen Shih ₄ , Ivan Infante ₃ , Maksym V Kovalenko _{1,

2}

Affiliation

Colloidal lead halide perovskite nanocrystals (NCs) have recently emerged as versatile photonic sources. Their processing and optoelectronic applications are hampered by the loss of colloidal stability and structural integrity due to the facile desorption of surface capping molecules during isolation and purification. To address this issue, herein, we propose a new ligand capping strategy utilizing common and inexpensive long-chain zwitterionic molecules such as 3-(N,N-dimethyloctadecylammonio)propanesulfonate, resulting in much improved chemical durability. In particular, this class of ligands allows for the isolation of clean NCs with high photoluminescence quantum yields (PL QYs) of above 90% after four rounds of precipitation/redispersion along with much higher overall reaction yields of uniform and colloidal dispersible NCs. Densely packed films of these NCs exhibit high PL QY values and effective charge transport. Consequently, they exhibit photoconductivity and low thresholds for amplified spontaneous emission of 2 μJ cm-2 under femtosecond optical excitation and are suited for efficient light-emitting diodes.

中文翻译：

胶体CsPbX3（X = Cl，Br，I）纳米晶体2.0：两性离子封端配体，可提高耐用性和稳定性。

胶态卤化钙钛矿型纳米晶体（NCs）最近已成为通用的光子源。由于在分离和纯化过程中表面加帽分子的容易解吸，胶体稳定性和结构完整性的损失阻碍了它们的加工和光电应用。为了解决这个问题，在本文中，我们提出了一种新的配体封端策略，该策略利用了普通且廉价的长链两性离子分子，例如3-（N，N-二甲基十八烷基氨基）丙烷磺酸盐，从而大大提高了化学耐久性。尤其是，这类配体可分离出四轮沉淀/再分散后具有90％以上的高光致发光量子产率（PL QYs）的清洁NC，以及均匀和胶体可分散NC的更高的整体反应产率。这些NC的密集包装薄膜表现出较高的PL QY值和有效的电荷传输。因此，它们在飞秒光激发下具有2μJcm-2的放大自发发射的光电导性和低阈值，适合于高效发光二极管。

更新日期：2018-02-09

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