Journal
NANO ENERGY
Volume 78, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105254
Keywords
PbS quantum Dots; Spray deposition; GISAXS; Near-infrared photodetector
Categories
Funding
- Deutsche Forschungsgemeinschaft, Germany (DFG, German Research Foundation) [EXC 2089/1-390776260]
- Center for NanoScience (CeNS)
- International Research Training Group 2022 Alberta/Technical University of Munich International Graduate School for Environmentally Responsible Functional Hybrid Materials (ATUMS)
- National Natural Science Foundation of China, China [61875082, 61674074]
- National Natural Science Foundation of China [2017YFE0120400]
- Natural Science Foundation of Guangdong, China [2017B030306010]
- China Scholarship Council (CSC), China
- BMBF project Flexiprobe [05K16WOA]
- TUM.solar
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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 x 10(12) Jones under an illumination power of 63.5 mu W/cm(2) 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.
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