Surface-passivated MAPbBr3 microwire with enhanced stability and suppressed ion migration,Journal of Materials Chemistry C

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Surface-passivated MAPbBr3 microwire with enhanced stability and suppressed ion migration
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2023-04-28 , DOI: 10.1039/d3tc00379e
Zeyao Han ₁ , Yang Liu ₁ , Yousheng Zou ₁ , Junyu Li ₁ , Yin He ₁ , Haibo Zeng ₁

Affiliation

One dimensional (1D) halide perovskites (HPs) have achieved tremendous progress in light emitting diodes, lasers, and photodetectors for their splendid optical properties, high mobility, and long diffusion length. However, unsatisfactory stability caused by inherent surface defects and notorious ion migration hinder their further development for commercial and practical applications. Herein, with the assistance of organic halide salts (phenyl-ethylammonium bromide (PEABr) and butylamine bromide (BABr)), we demonstrate a simple solution method for passivating the surface defects of the MAPbBr₃ microwire. Owing to the coordination bonding between amino groups and Pb²⁺, the PEA or BA molecules spontaneously assemble onto the surface of the as-fabricated microwire, leading to an obvious enhancement of the photoluminescence (PL) intensity and an extended PL lifetime. Meanwhile, negligible hysteresis was observed due to the suppressed ion migration. As a consequence, the constructed passivated microwire-based photodetector exhibits an increased responsivity of 35 mA W⁻¹, along with a −3 dB width of 740 Hz, a moderate LDR of 80 dB, and a weak noise current of 2.3 × 10⁻¹³ A × Hz^−0.5. Moreover, the device exhibits an enhanced stability for over 21 days under a humidity of 50%. This work provides an effective strategy to endow 1D perovskites with improved performance and stability for further applications in the future.

中文翻译：

具有增强稳定性和抑制离子迁移的表面钝化 MAPbBr3 微线

一维 (1D) 卤化物钙钛矿 (HP) 以其出色的光学特性、高迁移率和长扩散长度在发光二极管、激光器和光电探测器方面取得了巨大进步。然而，固有的表面缺陷和臭名昭著的离子迁移导致的稳定性不佳阻碍了它们在商业和实际应用中的进一步发展。在此，在有机卤化物盐（苯基乙基溴化铵 (PEABr) 和丁基溴化胺 (BABr)）的帮助下，我们展示了一种用于钝化 MAPbBr 3 微线表面缺陷的简单溶液_方法。由于氨基与Pb ^{2+之间的配位键}，PEA 或 BA 分子自发地组装到制造的微丝表面，导致光致发光 (PL) 强度明显增强并延长 PL 寿命。同时，由于离子迁移受到抑制，观察到的滞后现象可以忽略不计。因此，构建的基于钝化微线的光电探测器表现出 35 mA W ^-1的增加响应度，以及 740 Hz 的 -3 dB 宽度、80 dB 的适度 LDR 和 2.3 × 10 ^{-的弱噪声电流。 13}安 × 赫兹^-0.5。此外，该器件在 50% 的湿度下表现出超过 21 天的增强稳定性。这项工作提供了一种有效的策略，可以赋予一维钙钛矿更高的性能和稳定性，以便将来进一步应用。

更新日期：2023-04-29

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