Enhanced performance of I2-free solid-state dye-sensitized solar cells with conductive polymer up to 6.8%

Jeonghun Kim, Jong Kwan Koh, Byeonggwan Kim, Sung Hoon Ahn, Hyungju Ahn, Du Yeol Ryu, Jong Hak Kim, Eunkyoung Kim

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

An iodine-free solid-state dye-sensitized solar cell (ssDSSC) is reported here, with 6.8% energy conversion efficiency-one of the highest yet reported for N719 dye-as a result of enhanced light harvesting from the increased transmittance of an organized mesoporous TiO2 interfacial layer and the good hole conductivity of the solid-state-polymerized material. The organized mesoporous TiO2 (OM-TiO2) interfacial layer is prepared on large-area substrates by a sol-gel process, and is confirmed by scanning electron microscopy (SEM) and grazing incidence small-angle X-ray scattering (GISAXS). A 550-nm-thick OM-TiO2 film coated on fluorine-doped tin oxide (FTO) glass is highly transparent, resulting in transmittance increases of 8 and 4% compared to those of the bare FTO and conventional compact TiO2 film on FTO, respectively. The high cell performance is achieved through careful control of the electrode/hole transport material (HTM) and nanocrystalline TiO2/conductive glass interfaces, which affect the interfacial resistance of the cell. Furthermore, the transparent OM-TiO2 film, with its high porosity and good connectivity, exhibits improved cell performance due to increased transmittance in the visible light region, decreased interfacial resistance (Î

Original languageEnglish
Pages (from-to)4633-4639
Number of pages7
JournalAdvanced Functional Materials
Volume21
Issue number24
DOIs
Publication statusPublished - 2011 Dec 20

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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