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

178 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

Fingerprint

Thioacetamide
Deep level transient spectroscopy
Heterojunctions
heterojunctions
Solar cells
solar cells
traps
Conversion efficiency
spectroscopy
extinction
Lighting
illumination
augmentation
Open circuit voltage
open circuit voltage
cells
Masks
high voltages
crystallinity
x rays

Keywords

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

ASJC Scopus subject areas

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

Cite this

Highly improved Sb2S3 sensitized-inorganic-organic heterojunction solar cells and quantification of traps by deep-level transient spectroscopy. / Choi, Yong Chan; Lee, Dong Uk; Noh, Jun Hong; Kim, Eun Kyu; Seok, Sang Il.

In: Advanced Functional Materials, Vol. 24, No. 23, 18.06.2014, p. 3587-3592.

Research output: Contribution to journalArticle

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