Journal
ACS ENERGY LETTERS
Volume 3, Issue 5, Pages 1176-1182Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b00492
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Funding
- IISc, JNCASR
- Department of Science and Technology, Government of India
- CSIR
- National Academy of Sciences Allahabad, India (NASI)
- Jamsetji Tata Trust
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A low band gap ferroelectric material with a sizable polarization at ambient conditions would constitute an ideal photovoltaic material to harvest solar energy because of its efficient polarization-driven charge carrier separation. We achieve this elusive goal by codoping a Jahn-Teller Mi(3+) and Nb5+ pair for two Ti4+ ions in ferroelectric BaTiO3. Representing a charge-neutral dipole doping, this approach achieves for the first time a bulk ferroelectric oxide with the lowest band gap of 1.66 eV with a sizable polarization of nearly 70% of BaTiO3. We contrast this with the analogous system with Mn3+ replaced by the non-Jahn-Teller Fe3+ (3d(5)) ion, which even at a much lower level of doping reduces the polarization to 25% without reducing the band gap significantly, establishing the efficacy of the present strategy.
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