Colloidal Quantum Dot Solid-Based Infrared Optoelectronics Enabled by Solution-Phase Ligand Exchange

IF 2.9 4区 工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY
Min-Jae Si, Dongeon Kim, Seoryeon Jeong, Minjung Yang, Jeongeun Kim, Seo-Young Lee, In-Suh Lee, Jaewoo Jeong, Byeong-Chan Kim, Taeho Han, Beomkwan Kim, Yongnam Ahn, Seungin Jee, Yujin Jung, Se-Woong Baek
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Abstract

This study explores the rational strategy to build lead sulfide (PbS)-based colloidal quantum dots (CQDs) solid for high performance photodetection and solar energy conversion in the near- and short-wave infrared spectra. We demonstrated a facile engineering process from CQD synthesis to infrared CQD devices fabrication. By controlling the monomer concentration, we effectively tuned the infrared absorption characteristics and the solution-phase surface ligand exchange resulted in highly concentrated CQD ink, facilitating the formation of uniform, and thick CQD solids, which is crucial for high absorption efficiency. The CQD-based infrared photodetector achieved a specific detectivity of approximately 1011 Jones and fast response times under 100 ns. Furthermore, optimized PbS CQDs were utilized in solar cells and achieved high quantum efficiency across visible to infrared spectrum, indicating a significant potential for 2-terminal tandem structures with perovskite front cells.

Abstract Image

通过溶液相配体交换实现胶体量子点固态红外光电子学
本研究探讨了构建硫化铅(PbS)基胶体量子点(CQDs)固体的合理策略,以实现近红外和短波红外光谱中的高性能光电探测和太阳能转换。我们展示了从 CQD 合成到红外 CQD 器件制造的简便工程流程。通过控制单体浓度,我们有效地调整了红外吸收特性。溶液相表面配体交换产生了高浓度的 CQD 墨水,促进了均匀厚实的 CQD 固体的形成,这对高吸收效率至关重要。基于 CQD 的红外光探测器的比检测率约为 1011 琼斯,响应时间小于 100 毫微秒。此外,优化的 PbS CQD 被用于太阳能电池,并在可见光到红外光谱范围内实现了高量子效率,这表明双端串联结构与过氧化物前电池具有巨大的潜力。
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来源期刊
Korean Journal of Chemical Engineering
Korean Journal of Chemical Engineering 工程技术-工程:化工
CiteScore
4.60
自引率
11.10%
发文量
310
审稿时长
4.7 months
期刊介绍: The Korean Journal of Chemical Engineering provides a global forum for the dissemination of research in chemical engineering. The Journal publishes significant research results obtained in the Asia-Pacific region, and simultaneously introduces recent technical progress made in other areas of the world to this region. Submitted research papers must be of potential industrial significance and specifically concerned with chemical engineering. The editors will give preference to papers having a clearly stated practical scope and applicability in the areas of chemical engineering, and to those where new theoretical concepts are supported by new experimental details. The Journal also regularly publishes featured reviews on emerging and industrially important subjects of chemical engineering as well as selected papers presented at international conferences on the subjects.
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