The use of ferroelectric oxide perovskites as a stable photoactive layer has opened up a ground-breaking new arena of research in the field of energy. They can be cheaply produced and present an unconventional photovoltaic mechanism that may surpass the power conversion efficiencies dictated in traditional semiconductors. In this work we demonstrate that the band gap of solution processed BiFeO3 can be tuned towards the visible by exploring the novel substitution of Fe by Co, while enhancing ferroelectricity. Non-optimized vertical devices prove enhanced photo response.

Ferroelectrics for photovoltaics is a young field and composition and interface engineering offer immense potential to further improve device performances. Also, it is envisioned many new opportunities arising from better understanding of the cross-coupling mechanism between light absorption, polarization and electronic properties.

Band Gap Tuning of Solution-Processed Ferroelectric Perovskite BiFe1–xCoxO3 Thin Films
Pamela Machado, Mateusz Scigaj, Jaume Gazquez, Estel Rueda, Antonio Sánchez-Díaz, Ignasi Fina, Martí Gibert-Roca, Teresa Puig, Xavier Obradors, Mariano Campoy-Quiles, Mariona Coll
Chem. Mater. 31, 3, 947–954, 2019
DOI: 10.1021/acs.chemmater.8b04380

Figure: Solution processed BiFe1-xCoxO3 ferroelectric perovskite thin films are developed as promising photoactive layer. Band gap tuning is achieved by performing compositional tuning while enhancing ferroelectricity and photo response.

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