High-efficiency polymer photovoltaic cells using a solution-processable insulating interfacial nanolayer: The role of the insulating nanolayer

Kyung Geun Lim, Mi Ri Choi, Ho Beom Kim, Jong Hyeok Park, Tae Woo Lee

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)

Abstract

We employed a low-cost solution-processed ultrathin insulating polymeric layer of poly(4-hydroxystyrene) (PHS), with a high glass transition temperature (Tg ∼ 185°C), as an interfacial layer between the polymer:fullerene photoactive layer and the Al negative electrode for enhancing device power conversion efficiency (PCE) of polymer bulk-heterojunction photovoltaic cells and investigated the roles of the interfacial nanolayer by ultraviolet photoemission spectroscopy and capacitance-voltage measurement. The thin polymeric layer forms a dipole layer and causes the vacuum level of the adjacent negative electrode to shift upward, which resulted in an increase of the built-in potential. As a result, the open-circuit voltage and PCE of the device using a PHS nanolayer were remarkably improved. We finally achieved a very high PCE of 6.5% with the PHS/Al negative electrode which is even much better than that of the device using an Al electrode (5.0%). The solution-processed inexpensive PHS layer with a high Tg can be an attractive alternative to conventional vacuum-deposited low-work-function metal and insulating metal fluoride interfacial layers.

Original languageEnglish
Pages (from-to)25148-25153
Number of pages6
JournalJournal of Materials Chemistry
Volume22
Issue number48
DOIs
Publication statusPublished - 2012 Dec 28

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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