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Effect of Spinel Inversion on (Co x Fe 1− x ) 3 O 4 All‐Oxide Solar Cell Performance
Author(s) -
Yan Zhi,
Keller David A.,
Rietwyk Kevin J.,
Barad HannahNoa,
Majhi Koushik,
Ginsburg Adam,
Anderson Assaf Y.,
Zaban Arie
Publication year - 2016
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201500402
Subject(s) - spinel , crystallinity , materials science , oxide , cobalt , solar cell , band gap , cobalt oxide , chemical composition , analytical chemistry (journal) , chemical engineering , mineralogy , optoelectronics , chemistry , composite material , metallurgy , chromatography , organic chemistry , engineering
Oxide materials have been widely investigated for use as absorber layers in high‐performance solar cells, and in this study combinatorial methods were used to specifically investigate cobalt–iron (Co–Fe) oxide composites. Structural inversion of Co–Fe oxides from a normal to an inverse spinel structure occurs at the critical composition of approximately 33 % Fe added to Co, causing changes in the crystallinity, symmetry, sub‐lattice vibrational modes, optical bandgap, and electrical resistivity. When used as an absorber layer in all‐oxide solar cells with the multi‐layered geometry of glass|FTO|TiO 2 |Co–Fe–O|Au, enhanced photovoltaic performance was observed, with a maximum V oc of 534 mV at a composition of approximately 45 % Fe and a 200 % improvement in P max compared to cobalt‐rich devices. Using combinatorial data maps of the various material properties, a significant correlation between the solar cell properties and the chemical composition of the Co–Fe–O layer was revealed. This correlation allows for a better understanding of the Co–Fe–O system, which is a necessary step towards the development of Co–Fe–O‐based all‐oxide solar cells.