Facile preparation of a polymer-ZnO composite colloid as an electron transport layer and its effects on inverted polymer solar cells

Mo Beom Yi, Ja Ram Ku, Jin Soo Yoon, Jinha Kal, Wonhee Lee, Seong Geun Oh

Research output: Contribution to journalArticlepeer-review

Abstract

A polymer-ZnO colloidal solution was prepared as the organic-inorganic composite electron transport layer of inverted polymer solar cells (i-PSCs) by successive modification of ZnO particles with organic dispersant and polyethyleneimine (PEI), which offers an alternative to previously used complicated processes such as high temperature annealing or multi-layer coatings. The modification of ZnO surfaces with 2-(2-methoxyethoxy) acetic acid (MEA) provides colloidal stability and prevents aggregation of ZnO particles after adding PEI into the ZnO colloidal solution. The amount of incorporated PEI was increased to ~10 wt%, and the cell performance parameters of Jsc and fill factor (FF) were enhanced proportional to PEI content because of its contribution in decreasing the work function of ZnO ETL. By fabrication of i-PSCs with the modified ZnO ETL, the power conversion efficiency (PCE) was increased by ~40% from 5.10% to 7.51% in the ITO/ETL/PV-D4610:PC60BM/MoO3/Ag structure. The multi-functionalized ZnO ETL provides a more facile process for preparation of an organic-inorganic composite ETL to improve the performance of i-PSCs.

Original languageEnglish
Article number109538
JournalJournal of Physics and Chemistry of Solids
Volume145
DOIs
StatePublished - 2020 Oct

Keywords

  • Electron transport layer
  • Inverted polymer solar cell
  • Organic-inorganic composite
  • Sol-gel synthesis
  • ZnO

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