Highly improved Sb2S3 sensitized-inorganic-organic heterojunction solar cells and quantification of traps by deep-level transient spectroscopy

Yong Chan Choi, Dong Uk Lee, Jun Hong Noh, Eun Kyu Kim, Sang Il Seok

Research output: Contribution to journalArticle

243 Citations (Scopus)

Abstract

The light-harvesting Sb2S3 surface on mesoporous-TiO2 in inorganic-organic heterojunction solar cells is sulfurized with thioacetamide (TA). The photovoltaic performances are compared before and after TA treatment, and the state of the Sb2S3 is investigated by X-ray diffraction, X-ray photoelectron spectroscopy, and deep-level transient spectroscopy (DLTS). Although there are no differences in crystallinity and composition, the TA-treated solar cells exhibit significantly enhanced performance compared to pristine Sb2S3-sensitized solar cells. From DLTS analysis, the performance enhancement is mainly attributed to the extinction of trap sites, which are present at a density of (2-5) × 1014 cm-3 in Sb2S3, by TA treatment. Through such a simple treatment, the cell records an overall power conversion efficiency (PCE) of 7.5% through a metal mask under simulated illumination (AM 1.5G, 100 mW cm-2) with a very high open circuit voltage of 711.0 mV. This PCE is, thus far, the highest reported for fully solid-state chalcogenide-sensitized solar cells. The light-harvesting Sb 2S3 surface on mesoporous-TiO2 in inorganic-organic heterojunction solar cells is sulfurized with thioacetamide. Through such a simple treatment, the cell records an overall power conversion efficiency of 7.5% under simulated illumination (AM 1.5G, 100 mW cm -2) and the performance enhancement is mainly attributed to the extinction of trap sites by deep-level transient spectroscopy analysis.

Original languageEnglish
Pages (from-to)3587-3592
Number of pages6
JournalAdvanced Functional Materials
Volume24
Issue number23
DOIs
Publication statusPublished - 2014 Jun 18
Externally publishedYes

Keywords

  • deep-level transient spectroscopy
  • high efficiency
  • solar cells
  • thioacetamide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Condensed Matter Physics
  • Electrochemistry

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