Heterogeneous Integration of Colloidal Quantum Dot Inks on Silicon Enables Highly Efficient and Stable Infrared Photodetectors

IF 6.5 1区 物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Qiwei Xu, I. Teng Cheong, Hanfa Song, Vien Van, Jonathan G. C. Veinot and Xihua Wang*, 
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引用次数: 4

Abstract

Integrating lead sulfide (PbS) colloidal quantum dots (CQDs) with crystalline silicon (c-Si) has been proven to be an effective strategy in extending the sensitivity of Si-based photodetectors into infrared regime. Here, we demonstrate the successful integration of PbS CQD inks with Si and construct a highly efficient heterojunction infrared photodiode operating in the range from 800 up to 1500 nm. Thanks to the well-passivated Si surface by a two-step chlorination/methylation method and high-quality CQD inks, the heterojunction photodiode yields a low density of trap states, as validated by transient photovoltage and photocurrent measurements. With an insertion layer of a p-type CQD capped with 1,2-ethanedithiol ligands, the built-in electric field is much enhanced, leading to improved charge extractions. As a result, we have obtained an external quantum efficiency (EQE) of 44% at the excitonic wavelength of 1280 nm. The EQE values are maintained without detectable degradation through the course of more than 600 h, achieving superior device stability. In contrast to commercial solutions, which require high-temperature epitaxial deposition of germanium (Ge) or III–V compounds, the presented single-step spin-coating process of CQD inks also enables large-area integration on Si.

Abstract Image

胶体量子点油墨在硅上的异质集成实现了高效稳定的红外光电探测器
将硫化铅(PbS)胶体量子点(CQDs)与晶体硅(c-Si)集成已被证明是将硅基光电探测器的灵敏度扩展到红外波段的有效策略。在这里,我们展示了PbS CQD油墨与Si的成功集成,并构建了一个高效的异质结红外光电二极管,工作范围从800到1500 nm。通过两步氯化/甲基化方法和高质量的CQD墨水,异质结光电二极管产生了低密度的陷阱态,并通过瞬态光电压和光电流测量得到了验证。当p型CQD的插入层被1,2-乙二硫醇配体覆盖时,其内置电场大大增强,从而改善了电荷的提取。在激子波长1280 nm处,我们获得了44%的外量子效率(EQE)。EQE值在超过600小时的过程中保持无可检测的退化,实现了卓越的设备稳定性。与需要高温外延沉积锗(Ge)或III-V化合物的商业解决方案不同,CQD油墨的单步自旋镀膜工艺也可以在Si上大面积集成。
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来源期刊
ACS Photonics
ACS Photonics NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
11.90
自引率
5.70%
发文量
438
审稿时长
2.3 months
期刊介绍: Published as soon as accepted and summarized in monthly issues, ACS Photonics will publish Research Articles, Letters, Perspectives, and Reviews, to encompass the full scope of published research in this field.
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