Spray-deposited PbS colloidal quantum dot solid for near-infrared photodetectors

Wei Chen, Haodong Tang, Yulong Chen, Julian E. Heger, Nian Li, Lucas P. Kreuzer, Yue Xie, Depeng Li, Carl Anthony, Zoe Pikramenou, Kar Wei Ng, Xiao Wei Sun, Kai Wang, Peter Müller-Buschbaum

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

Colloidal PbS quantum dots (QDs) are promising candidates for various optoelectronic applications based on solution-processed thin-film techniques. In this work, a versatile layer-by-layer (LBL) spray deposition of the QDs is introduced aiming for a future large-scale fabrication process of optoelectronic devices. As compared to spin-coated QD solids, a smaller inter-dot distance and a better-ordered superlattice stacking behavior of the QDs are found in the spray-deposited QD solids as confirmed by grazing-incidence small-angle X-ray scattering (GISAXS). The spectral mapping combined time-resolved photoluminescence analysis indicates a longer charge carrier lifetime and better order of the energy state distribution of the spray-deposited QD solid comparing with the spin-coated one. Thus, photodetectors based on spray deposition of QD solids demonstrate an excellent device performance, with the responsivity achieving 365.1 A/W and the detectivity reaching up to 1.4 × 1012 Jones under an illumination power of 63.5 μW/cm2 at a wavelength of 1250 nm. The spray-deposited device performances indicate a great potential of spray deposition of large sized QDs in large-scale fabrications for optoelectronics using longer wavelengths.

Original languageEnglish
Article number105254
JournalNano Energy
Volume78
DOIs
Publication statusPublished - Dec 2020

Bibliographical note

Funding Information:
This work was supported by funding from the Deutsche Forschungsgemeinschaft, Germany (DFG, German Research Foundation) under Germany's Excellence Strategy ? EXC 2089/1?390776260 (e-conversion), TUM.solar in the context of the Bavarian Collaborative Research Project Solar Technologies Go Hybrid (SolTech), the Center for NanoScience (CeNS) and the International Research Training Group 2022 Alberta/Technical University of Munich International Graduate School for Environmentally Responsible Functional Hybrid Materials (ATUMS). K.W. acknowledges funding supports from the National Natural Science Foundation of China, China (No.61875082, No. 61674074), National Natural Science Foundation of China (No.2017YFE0120400), and Natural Science Foundation of Guangdong, China (No.2017B030306010). W.C. and N.L. are grateful to the support from the China Scholarship Council (CSC), China and L.P.K. from the BMBF project ?Flexiprobe? (grant number 05K16WOA). The authors thank Prof. Alexander Holleitner and Peter Weiser for providing access to the SEM.

Funding Information:
This work was supported by funding from the Deutsche Forschungsgemeinschaft, Germany (DFG, German Research Foundation) under Germany's Excellence Strategy – EXC 2089/1–390776260 (e-conversion), TUM.solar in the context of the Bavarian Collaborative Research Project Solar Technologies Go Hybrid (SolTech), the Center for NanoScience (CeNS) and the International Research Training Group 2022 Alberta/Technical University of Munich International Graduate School for Environmentally Responsible Functional Hybrid Materials (ATUMS). K.W. acknowledges funding supports from the National Natural Science Foundation of China, China (No. 61875082 , No. 61674074 ), National Natural Science Foundation of China (No. 2017YFE0120400 ), and Natural Science Foundation of Guangdong, China (No. 2017B030306010 ). W.C. and N.L. are grateful to the support from the China Scholarship Council (CSC), China and L.P.K. from the BMBF project “Flexiprobe” (grant number 05K16WOA ). The authors thank Prof. Alexander Holleitner and Peter Weiser for providing access to the SEM.

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

  • GISAXS
  • Near-infrared photodetector
  • PbS quantum Dots
  • Spray deposition

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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