Room-Temperature Solution-Processed n-Doped Zirconium Oxide Cathode Buffer Layer for Efficient and Stable Organic and Hybrid Perovskite Solar Cells

Chih Yu Chang, Wen Kuan Huang, Jhao Lin Wu, Yu Chia Chang, Kuan Ting Lee, Chin Ti Chen

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

In this study, we present a simple and effective method to improve the performance and stability of organic and hybrid perovskite solar cells by the incorporation of solution-processed cetyltrimethylammonium bromide (CTAB)-doped zirconium oxide (ZrOx) as cathode buffer layer (CBL). This novel n-doped ZrOx CBL possesses several remarkable features, including ease of fabrication without the need for thermal annealing or any other post-treatment, reasonable electrical conductivity (2.9 × 10-5 S cm-1), good ambient stability, effective work function modulation of Ag electrode, relative weak thickness-dependent performance property, and wide applicability in a variety of active layers. Compared with ZrOx CBL without CTAB dopant, CTAB-doped ZrOx can significantly improve the power conversion efficiency (PCE) from 0.57% to 2.48% in organic solar cells based on diketopyrrolopyrrole-thiophene-bezothiadazole low-bandgap polymer (PDPP-TBT):[6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) blend. With this n-doped ZrOx CBL, organic solar cells based on polythieno(3,4-b)-thiophene-alt-benzodithiophene (PTB7):PC71BM blend deliver a record high PCE of 9.3%. The effectiveness of this novel CBL also extends to perovskite solar cells, and a high PCE up to 15.9% is demonstrated, which is superior to those of the devices with undoped ZrOx and state-of-the-art CBL zinc oxide nanoparticle film. In addition, this approach is applicable to the development of high-performance semitransparent solar cells. More significantly, the long-term ambient stability of the resulting devices can be secured without the need of rigorous encapsulation.

Original languageEnglish
Pages (from-to)242-251
Number of pages10
JournalChemistry of Materials
Volume28
Issue number1
DOIs
Publication statusPublished - Jan 12 2016
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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