Induced growth of CsPbBr3 perovskite films by incorporating metal chalcogenide quantum dots in PbBr2 films for performance enhancement of inorganic perovskite solar cells

Eui Jin Lee, Dae Hwan Kim, Robert P.H. Chang, Dae Kue Hwang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Cesium lead bromide (CsPbBr3), an inorganic perovskite material with a large band gap energy (Eg = 2.3 eV), is a great candidate to produce stable and semitransparent perovskite solar cell (PSC) platforms owing to its complete and stable perovskite structure in humid environments. We synthesized quantum dots (QDs) composed of five atoms, copper (Cu), zinc (Zn), indium (In), sulfur (S), and selenium (Se; CZISSe QDs), and incorporated them into CsPbBr3 inorganic perovskite films. To enable the dispersion of CsPbBr3-capped CZISSe QDs in a PbBr2 solution, we used the ligand-exchange method to substitute an inorganic CsPbBr3 shell instead of the long organic capping chains. CZISSe QDs functioned as crystal nuclei seeds in the PbBr2 film and promoted the crystallization of CsPbBr3. Furthermore, they were present in the mesoporous TiO2-CsPbBr3 perovskite layer, improving the extraction and transport of electrons from the CsPbBr3 light absorption layer to the TiO2. Consequently, the power conversion efficiency of the QD-containing inorganic PSC was enhanced by 20.6% compared to that of the QD-free PSC.

Original languageEnglish (US)
Pages (from-to)10376-10383
Number of pages8
JournalACS Applied Energy Materials
Volume3
Issue number11
DOIs
StatePublished - Nov 23 2020

Keywords

  • CZISSe quantum dots
  • Cesium lead bromide perovskite
  • Charge transport
  • Inorganic perovskite solar cells
  • Ligand exchange

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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