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Sensitive and Stable Tin-Lead Hybrid Perovskite Photodetectors Enabled by Double-Sided Surface Passivation for Infrared Upconversion Detection.
Small ( IF 13.0 ) Pub Date : 2020-05-17 , DOI: 10.1002/smll.202001534 Yan Zhao 1 , Chenglong Li 1 , Jizhong Jiang 1 , Boming Wang 1 , Liang Shen 1
Small ( IF 13.0 ) Pub Date : 2020-05-17 , DOI: 10.1002/smll.202001534 Yan Zhao 1 , Chenglong Li 1 , Jizhong Jiang 1 , Boming Wang 1 , Liang Shen 1
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Tin(Sn)‐based perovskite is currently considered one of the most promising materials due to extending the absorption spectrum and reducing the use of lead (Pb). However, Sn2+ is easily oxidized to Sn4+ in atmosphere, causing more defects and degradation of perovskite materials. Herein, double‐sided interface engineering is proposed, that is, Sn‐Pb perovskite films are sandwiched between the phenethylammonium iodide (PEAI) in both the bottom and top sides. The larger organic cations of PEA+ are arranged into a perovskite surface lattice to form a 2D capping layer, which can effectively prevent the water and oxygen to destroy bulk perovskite. Meanwhile, the PEA+ can also passivate defects of iodide anions at the bottom of perovskite films, which is always present but rarely considered previously. Compared to one sided passivation, Sn‐Pb hybrid perovskite photodetectors contribute a significant enhancement of performance and stability, yielding a broadband response of 300–1050 nm, a low dark current density of 1.25 × 10–3 mA cm–2 at –0.1 V, fast response speed of 35 ns, and stability beyond 240 h. Furthermore, the Sn‐Pb broadband photodetectors are integrated in an infrared up‐conversion system, converting near‐infrared light into visible light. It is believed that a double‐sided passivation method can provide new strategies to achieving high‐performance perovskite photodetectors.
中文翻译：
通过双面表面钝化实现的敏感，稳定的锡铅混合钙钛矿光电探测器，用于红外上转换检测。
基于锡（Sn）的钙钛矿由于扩展了吸收光谱并减少了铅（Pb）的使用，目前被认为是最有前途的材料之一。但是，Sn 2+容易被氧化成Sn 4+会导致更多的缺陷和钙钛矿材料的降解。在此，提出了双面界面工程，即在底面和顶面的碘化苯乙铵（PEAI）之间夹有Sn-Pb钙钛矿薄膜。PEA +的较大有机阳离子排列在钙钛矿表面晶格中，形成2D覆盖层，可以有效防止水和氧气破坏大量的钙钛矿。同时，PEA +还可以钝化钙钛矿薄膜底部的碘化物阴离子缺陷，这种缺陷一直存在，但以前很少考虑。与单面钝化相比，Sn-Pb混合钙钛矿光电探测器显着增强了性能和稳定性，产生了300-1050 nm的宽带响应，1.25×10 –3的低暗电流密度mA cm –2在–0.1 V时，响应速度为35 ns，稳定性超过240 h。此外，Sn-Pb宽带光电探测器集成在红外上转换系统中，可将近红外光转换为可见光。相信双面钝化方法可以为实现高性能钙钛矿光电探测器提供新的策略。
更新日期：2020-07-02
中文翻译：
通过双面表面钝化实现的敏感，稳定的锡铅混合钙钛矿光电探测器，用于红外上转换检测。
基于锡（Sn）的钙钛矿由于扩展了吸收光谱并减少了铅（Pb）的使用，目前被认为是最有前途的材料之一。但是，Sn 2+容易被氧化成Sn 4+会导致更多的缺陷和钙钛矿材料的降解。在此，提出了双面界面工程，即在底面和顶面的碘化苯乙铵（PEAI）之间夹有Sn-Pb钙钛矿薄膜。PEA +的较大有机阳离子排列在钙钛矿表面晶格中，形成2D覆盖层，可以有效防止水和氧气破坏大量的钙钛矿。同时，PEA +还可以钝化钙钛矿薄膜底部的碘化物阴离子缺陷，这种缺陷一直存在，但以前很少考虑。与单面钝化相比，Sn-Pb混合钙钛矿光电探测器显着增强了性能和稳定性，产生了300-1050 nm的宽带响应，1.25×10 –3的低暗电流密度mA cm –2在–0.1 V时，响应速度为35 ns，稳定性超过240 h。此外，Sn-Pb宽带光电探测器集成在红外上转换系统中，可将近红外光转换为可见光。相信双面钝化方法可以为实现高性能钙钛矿光电探测器提供新的策略。
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