硫化铅
材料科学
量子点
光电探测器
光电子学
响应度
吸收(声学)
量子效率
红外线的
异质结
可见光谱
波长
光学
物理
复合材料
作者
Chen Dong,Shuyi Liu,Nilesh Barange,Jaewoong Lee,Tyler N. Pardue,Xueping Yi,Shichen Yin,Franky So
标识
DOI:10.1021/acsami.9b16539
摘要
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.
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