Efficient electron injection in non-toxic silver sulfide (Ag2S) sensitized solar cells

Heping Shen, Xingjian Jiao, Dan Oron, Jianbao Li, Hong Lin

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

α-Ag2S, with a direct forbidden bandgap of about 1.0 eV, is a non-toxic low bandgap semiconductor which can readily be deposited in the form of a thin film by chemical bath deposition. In a solar cell configuration, it can potentially provide a high short-circuit current due to the infrared absorption, and is compatible with the polysulfide electrolyte. Its practical use in a solar cell depends, however, critically on band alignment between the Ag2S, the oxide anode and the electrolyte redox potential. Here we examine the conduction band (CB) offsets in the nanostructured α-Ag 2S sensitized TiO2 and SnO2 electrodes by X-ray Photoelectron Spectroscopy, and show that they can significantly differ from the extrapolated bulk values. The much higher CB offset for SnO 2/Ag2S interface (∼0.6 eV) compared with that of ∼0.2 eV for TiO2/Ag2S, supplied a sufficient injection driving force and was favorable for the electron separation at the heterojunction. When fabricated into solar cells, a dramatically higher current density under AM 1.5 illumination for the SnO2/Ag2S heterojunction was obtained, which was contributed by the efficient electron injection.

Original languageEnglish
Pages (from-to)8-13
Number of pages6
JournalJournal of Power Sources
Volume240
DOIs
Publication statusPublished - 2013

Fingerprint

Electron injection
sulfides
Solar cells
Silver
solar cells
silver
injection
Conduction bands
Electrolytes
Heterojunctions
heterojunctions
conduction bands
Energy gap
electrolytes
polysulfides
Polysulfides
electrons
Infrared absorption
short circuit currents
Short circuit currents

Keywords

  • Conduction band offset
  • Electron injection
  • Non-toxic
  • Semiconductor sensitized solar cell
  • Silver sulfide

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

Cite this

Efficient electron injection in non-toxic silver sulfide (Ag2S) sensitized solar cells. / Shen, Heping; Jiao, Xingjian; Oron, Dan; Li, Jianbao; Lin, Hong.

In: Journal of Power Sources, Vol. 240, 2013, p. 8-13.

Research output: Contribution to journalArticle

Shen, Heping ; Jiao, Xingjian ; Oron, Dan ; Li, Jianbao ; Lin, Hong. / Efficient electron injection in non-toxic silver sulfide (Ag2S) sensitized solar cells. In: Journal of Power Sources. 2013 ; Vol. 240. pp. 8-13.
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