Solution-processed Cu2ZnSnS4 nanocrystal solar cells

Efficient stripping of surface insulating layers using alkylating agents

Satoshi Suehiro, Keisuke Horita, Kota Kumamoto, Masayoshi Yuasa, Tooru Tanaka, Katsuhiko Fujita, Kengo Shimanoe, Tetsuya Kida

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Solution-processed photovoltaic (PV) devices based on semiconductor nanocrystals (NCs) such as Cu2ZnSnS4 (CZTS) and CuInS 2 (CIS) are attracting much attention for use in next-generation solar cells. However, the performance of NC-based devices is hindered by insulating surface-capping ligands that limit transfer/transport of charged carriers. Here, to remove surface-capping ligands (long-chain fatty amines) from NCs, we use the strong alkylating agent methyl iodide, which converts primary amines to quaternary amines that have low coordinating affinity to the NC surface. X-ray diffraction, Raman spectroscopy, and Fourier transform infrared spectroscopy analyses confirm the successful removal of capping ligands from the CZTS surface after treatment with methyl iodide without changing the crystal structure of CZTS. CZTS and CIS NC-based devices treated with methyl iodide exhibit a reproducible PV response under simulated sunlight. The developed route can potentially enhance the performance of NC-based devices used in a broad range of applications.

Original languageEnglish
Pages (from-to)804-810
Number of pages7
JournalJournal of Physical Chemistry C
Volume118
Issue number2
DOIs
Publication statusPublished - Jan 16 2014

Fingerprint

Alkylating Agents
stripping
Nanocrystals
Solar cells
nanocrystals
solar cells
iodides
Amines
amines
Ligands
ligands
sunlight
surface treatment
Fourier transform infrared spectroscopy
Raman spectroscopy
affinity
Cu2ZnSnS4
Crystal structure
infrared spectroscopy
routes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Solution-processed Cu2ZnSnS4 nanocrystal solar cells : Efficient stripping of surface insulating layers using alkylating agents. / Suehiro, Satoshi; Horita, Keisuke; Kumamoto, Kota; Yuasa, Masayoshi; Tanaka, Tooru; Fujita, Katsuhiko; Shimanoe, Kengo; Kida, Tetsuya.

In: Journal of Physical Chemistry C, Vol. 118, No. 2, 16.01.2014, p. 804-810.

Research output: Contribution to journalArticle

Suehiro, Satoshi ; Horita, Keisuke ; Kumamoto, Kota ; Yuasa, Masayoshi ; Tanaka, Tooru ; Fujita, Katsuhiko ; Shimanoe, Kengo ; Kida, Tetsuya. / Solution-processed Cu2ZnSnS4 nanocrystal solar cells : Efficient stripping of surface insulating layers using alkylating agents. In: Journal of Physical Chemistry C. 2014 ; Vol. 118, No. 2. pp. 804-810.
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