Solution-Processed Air-Stable Mesoscopic Selenium Solar Cells

Menghua Zhu, Feng Hao, Lin Ma, Tze Bin Song, Claire E. Miller, Michael R Wasielewski, Xin Li, Mercouri G Kanatzidis

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Crystalline selenium (c-Se) is a direct band gap semiconductor and has been developed for detector applications for more than 30 years. While most advances have been made using vacuum deposition processes, it remains a challenge to prepare efficient c-Se devices directly from solution. We demonstrate a simple solution process leading to uniform and high-crystallinity selenium films under ambient conditions. A combination of ethylenediamine (EDA) and hydrazine solvents was found to be effective in dissolving selenium powder and forming highly concentrated solutions. These can be used to infiltrate a mesoporous titanium dioxide layer and form a smooth and pinhole-free capping overlayer. Efficient light-induced charge injection from the crystalline selenium to TiO2 was observed using transient absorption spectroscopy. A small amount of EDA addition in the hydrazine solution was found to improve the film coverage significantly, and on the basis of the finding, we are able to achieve up to 3.52% power conversion efficiency solar cells with a fill factor of 57%. These results provide a method to control the crystalline selenium film and represent significant progress in developing low-cost selenium-based solar cells.

Original languageEnglish
Pages (from-to)469-473
Number of pages5
JournalACS Energy Letters
Volume1
Issue number2
DOIs
Publication statusPublished - Aug 12 2016

Fingerprint

Selenium
Solar cells
ethylenediamine
hydrazine
Air
Crystalline materials
Hydrazine
Vacuum deposition
Charge injection
Absorption spectroscopy
Powders
Titanium dioxide
Conversion efficiency
Energy gap
Semiconductor materials
Detectors
Costs

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

Cite this

Solution-Processed Air-Stable Mesoscopic Selenium Solar Cells. / Zhu, Menghua; Hao, Feng; Ma, Lin; Song, Tze Bin; Miller, Claire E.; Wasielewski, Michael R; Li, Xin; Kanatzidis, Mercouri G.

In: ACS Energy Letters, Vol. 1, No. 2, 12.08.2016, p. 469-473.

Research output: Contribution to journalArticle

Zhu, Menghua ; Hao, Feng ; Ma, Lin ; Song, Tze Bin ; Miller, Claire E. ; Wasielewski, Michael R ; Li, Xin ; Kanatzidis, Mercouri G. / Solution-Processed Air-Stable Mesoscopic Selenium Solar Cells. In: ACS Energy Letters. 2016 ; Vol. 1, No. 2. pp. 469-473.
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