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首页> 外文期刊>Advanced Functional Materials >Improved Stability and Photodetector Performance of CsPbI_3 Perovskite Quantum Dots by Ligand Exchange with Aminoethanethiol
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Improved Stability and Photodetector Performance of CsPbI_3 Perovskite Quantum Dots by Ligand Exchange with Aminoethanethiol

机译：通过与氨基乙硫醇的配体交换提高了CsPbI_3钙钛矿量子点的稳定性和光电探测器性能

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摘要

A surface engineering strategy aimed at improving the stability of CsPbI3 perovskite quantum dots (QDs) both in solution and as films is demonstrated, by performing partial ligand exchange with a short chain ligand, 2-aminoethanethiol (AET), in place of the original long chain ligands, oleic acid (OA) and oleylamine (OAm), used in synthesis. This results in the formation of a compact ligand barrier around the particles, which prevents penetration of water molecules and thus degradation of the films and, in addition, at the same time improves carrier mobility. Moreover, the AET ligand can passivate surface traps of the QDs, leading to an enhanced photoluminescence (PL) efficiency. As a result, AET-CsPbI3 QDs maintain their optical performance both in solution and as films, retaining more than 95% of the initial PL intensity in water after 1 h, and under ultraviolet irradiation for 2 h. Photodetectors based on the AET-CsPbI3 QD films exhibit remarkable performance, such as high photoresponsivity (105 mA W-1) and detectivity (5 x 10(13) Jones at 450 nm and 3 x 10(13) Jones at 700 nm) without an external bias. The photodetectors also show excellent stability, retaining more than 95% of the initial responsivity in ambient air for 40 h without any encapsulation.
机译：通过与短链配体2-氨基乙硫醇（AET）进行部分配体交换，代替原来的长链，证明了旨在改善溶液和薄膜中CsPbI3钙钛矿量子点（QDs）稳定性的表面工程策略。链配体，油酸（OA）和油胺（OAm），用于合成。这导致在颗粒周围形成紧密的配体阻挡层，这防止了水分子的渗透并因此防止了膜的降解，此外，同时还改善了载流子迁移率。此外，AET配体可以钝化QD的表面陷阱，从而提高光致发光（PL）效率。结果，AET-CsPbI3 QD在溶液和薄膜中均保持其光学性能，在1 h后和在紫外线照射下2 h，在水中保留超过95％的初始PL强度。基于AET-CsPbI3 QD薄膜的光电探测器表现出卓越的性能，例如不具有高光响应性（105 mA W-1）和探测性（450 nm处的5 x 10（13）Jones和700 nm处的3 x 10（13）Jones）外部偏见。光电探测器还显示出出色的稳定性，无需任何封装即可在环境空气中保持超过95％的初始响应度40小时。

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