Structural, optical and electrical impacts of marcasite in pyrite thin films

Dong Gwon Moon, Shanza Rehan, Soo Yeon Lim, Dahyun Nam, Ilwan Seo, Jihye Gwak, Hyeonsik Cheong, Yong Soo Cho, Yunsang Lee, Se Jin Ahn

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

The structural and electro-optical influence of marcasite on the properties of solution-processed iron pyrite thin films was investigated. Marcasite has a strong tendency to form simultaneously with pyrite upon sulfurization of amorphous iron-oxide precursor films, leading to a mixed-phase structure in which pyrite grains are surrounded by nanocrystalline marcasite boundaries. The optical analysis in combination with spectroscopic ellipsometry revealed that marcasite should have a bandgap of approximately 0.85–0.88 eV with a higher absorption coefficient than pyrite, differing strongly from the prior belief that marcasite has a bandgap of less than 0.4 eV. In addition, the pyrite/marcasite film has been found to have a larger diffusion coefficient for photogenerated minority carriers than the phase-pure pyrite film from electrochemical impedance analyses, resulting in a higher photocurrent density, as determined through photoelectrochemical measurement. The facile transport of a minority carrier along the marcasite boundaries is the putative origin of the observed improvement in the photoactivity of the pyrite/marcasite mixture films.

Original languageEnglish
Pages (from-to)930-939
Number of pages10
JournalSolar Energy
Volume159
DOIs
Publication statusPublished - 2018 Jan 1

Bibliographical note

Funding Information:
This work was conducted under the framework of the Research and Development Program of the Korea Institute of Energy Research (B7-2426) and (B7-2421-01).

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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