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Jang, Sung-Yeon
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Improved Passivation of PbS Quantum Dots for Solar Cells Using Triethylamine Hydroiodide

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Title
Improved Passivation of PbS Quantum Dots for Solar Cells Using Triethylamine Hydroiodide
Author
Park, DasomAzmi, RandiCho, YounghoKim, Hyung MinJang, Sung-YeonYim, Sanggyu
Issue Date
2019-06
Publisher
American Chemical Society
Citation
ACS SUSTAINABLE CHEMISTRY & ENGINEERING, v.7, no.12, pp.10784 - 10791
Abstract
Surface passivation of colloidal quantum dot (CQD) is one of the most crucial factors used to determine the power conversion efficiency (PCE) of CQD based solar cell (CQDSC) devices. In this work, we developed novel alkylammonium iodide based ligands, which can achieve more effective passivation of iodide for PbS based CQD than the conventionally used tetra-n-butylammonium iodide (TBAI). Sufficient ion dissociation property and higher acidity of triethylamine hydroiodide (tri-EAHI) led to the enhanced oleate ligand removal and iodide passivation compared to TBAI. Owing to the improved iodide passivation by tri-EAHI, the sub-bandgap trap density was successfully reduced, which offered lower doping density and higher electron mobility than TBAI. As a result, the depletion region in CQD active layers was widened, while the charge recombination in CQDSC was significantly reduced. The CQDSCs with the tri-EAHI achieved significantly higher PCE (9.84%) than that obtained using conventional TBAI (9.20%).
URI
https://scholarworks.unist.ac.kr/handle/201301/27026
URL
https://pubs.acs.org/doi/10.1021/acssuschemeng.9b01542
DOI
10.1021/acssuschemeng.9b01542
ISSN
2168-0485
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