High-Efficiency PbS Quantum-Dot Solar Cells with Greatly Simplified Fabrication Processing via "Solvent-Curing"

Kunyuan Lu, Yongjie Wang, Zeke Liu, Lu Han, Guozheng Shi, Honghua Fang, Jun Chen, Xingchen Ye, Si Chen, Fan Yang, Artem G. Shulga, Tian Wu, Mengfan Gu, Sijie Zhou, Jian Fan, Maria Antonietta Loi, Wanli Ma

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Abstract

PbS quantum-dot (QD) solar cells are promising candidates for low-cost solution-processed photovoltaics. However, the device fabrication usually requires ten more times film deposition and rinsing steps, which is not ideal for scalable manufacturing. Here, a greatly simplified deposition processing is demonstrated by replacing methanol with acetonitrile (ACN) as the rinsing solvent. It is discovered that ACN can effectively cure the film cracks generated from the volume loss during the solid-state ligand-exchange process, which enables the deposition of thick and dense films with much fewer deposition steps. Meanwhile, due to the aprotic nature of ACN, fewer trap states can be introduced during the rinsing process. As a result, with only three deposition steps for the active layer, a CPVT-certified 11.21% power conversion efficiency is obtained, which is the highest efficiency ever reported for PbS QD solar cells employing a solid-state ligand-exchange process. More importantly, the simple film-deposition processing provides an opportunity for the future application of QDs in low-cost printing of optoelectronic devices.

Original languageEnglish
Article number1707572
Number of pages9
JournalAdvanced materials
Volume30
Issue number25
DOIs
Publication statusPublished - 20-Jun-2018

Keywords

  • PbS quantum dots
  • rinsing solvent
  • solar cells
  • solvent-curing
  • NANOCRYSTALS
  • FILMS
  • PHOTOVOLTAICS
  • PERFORMANCE
  • SOLIDS
  • OXIDATION
  • MOBILITY
  • METHANOL
  • LIGANDS
  • INKS

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