Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 27th March 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 10, 2019
Previous Article Next Article

Structure–property relations in Ag–Bi–I compounds: potential Pb-free absorbers in solar cells

Author affiliations

Abstract

Recently, Ag–Bi–I system has attracted significant attention as an emergent material for absorbers in solar cells. We have investigated the single-phase compositions, analyzed the detailed crystal structures, measured optical and electronic properties, and determined the structure–property relations of Ag2−3xBixI2. Single-phase samples with CdCl2-type rhombohedral structures were obtained with Ag-rich compositions (x = 0.45–0.48), while defect-spinel-type cubic structures were stabilized with Bi-rich compositions (x = 0.52–0.57). Both the rhombohedral and cubic structures consisted of the cubic close-packed I-ion sublattices, and the small difference in the Ag/Bi composition resulted in distinct crystal structures. Both the CdCl2-type rhombohedral and defect-spinel-type cubic compounds exhibited semiconducting behavior with proper band gap energies, which indicates that both materials are potentially useful as absorbers in solar cells. The rhombohedral structure compounds have shallower valence band energies, larger indirect band gap energies, and higher electrical conductivity with lower activation energy than the cubic structure compounds. The distinct properties result from the difference in the defect structures, additional Ag occupation in the rhombohedral phase and deficiencies of the octahedral site in the cubic phase.

Graphical abstract: Structure–property relations in Ag–Bi–I compounds: potential Pb-free absorbers in solar cells

Back to tab navigation

Publication details

The article was received on 22 Nov 2018, accepted on 05 Feb 2019 and first published on 05 Feb 2019


Article type: Paper
DOI: 10.1039/C8TA11227D
Citation: J. Mater. Chem. A, 2019,7, 5583-5588

  •   Request permissions

    Structure–property relations in Ag–Bi–I compounds: potential Pb-free absorbers in solar cells

    A. Koedtruad, M. Goto, M. Amano Patino, Z. Tan, H. Guo, T. Nakamura, T. Handa, W. Chen, Y. Chuang, H. Sheu, T. Saito, D. Kan, Y. Kanemitsu, A. Wakamiya and Y. Shimakawa, J. Mater. Chem. A, 2019, 7, 5583
    DOI: 10.1039/C8TA11227D

Search articles by author

Spotlight

Advertisements