Long-Wavelength Lead Sulfide Quantum Dots Sensing up to 2600 nm for Short-Wavelength Infrared Photodetectors,ACS Applied Materials & Interfaces

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Long-Wavelength Lead Sulfide Quantum Dots Sensing up to 2600 nm for Short-Wavelength Infrared Photodetectors
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-11-15 , DOI: 10.1021/acsami.9b16539
Chen Dong ₁ , Shuyi Liu ₁ , Nilesh Barange ₁ , Jaewoong Lee ₁ , Tyler Pardue ₁ , Xueping Yi ₁ , Shichen Yin ₁ , Franky So ₁

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Lead sulfide nanoparticles (PbS NPs) are used in the short-wavelength infrared photodetectors because of their excellent photosensitivity, band gap tunability, and solution processability. It has been a challenge to synthesize high-quality PbS NPs with an absorption peak beyond 2000 nm. In this work, using PbS seed crystals with an absorption peak at 1960 nm, we report a successful synthesis of very large monodispersed PbS NPs having a diameter up to 16 nm by multiple injections. The resulting NPs have an absorption peak over 2500 nm with a small full width at half-maximum of 24 meV. To demonstrate the applications of such large quantum dots (QDs), broadband heterojunction photodetectors are fabricated with the large PbS QDs of an absorption peak at 2100 nm. The resulting devices have an external quantum efficiency (EQE) of 25% (over 50% internal quantum efficiency) at 2100 nm corresponding to a responsivity of 0.385 A/W and an EQE of ∼60% in the visible range.

中文翻译：

用于短波长红外光电探测器的高达2600 nm的长波长硫化铅量子点检测

硫化铅纳米颗粒（PbS NPs）由于其出色的光敏性，带隙可调性和溶液加工性而用于短波长红外光电探测器。合成吸收峰超过2000 nm的高质量PbS NP一直是一个挑战。在这项工作中，使用吸收峰在1960 nm处的PbS籽晶，我们报告了通过多次进样成功合成直径高达16 nm的非常大的单分散PbS NP。所得的NP在2500 nm处有一个吸收峰，在24 meV的一半最大值处有一个小的全宽度。为了演示这种大量子点（QD）的应用，制造了宽带异质结光电探测器，该探测器具有在2100 nm处吸收峰的大PbS QD。

更新日期：2019-11-15

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