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Giant photovoltaic response in band engineered ferroelectric perovskite #MMPMID29789634
Pal S; Swain AB; Biswas PP; Murali D; Pal A; Nanda BRK; Murugavel P
Sci Rep 2018[]; 8 (ä): ä PMID29789634show ga
Recently the solar energy, an inevitable part of green energy source, has become a mandatory topics in frontier research areas. In this respect, non-centrosymmetric ferroelectric perovskites with open circuit voltage (VOC) higher than the bandgap, gain tremendous importance as next generation photovoltaic materials. Here a non-toxic co-doped Ba1?x(Bi0.5Li0.5)xTiO3 ferroelectric system is designed where the dopants influence the band topology in order to enhance the photovoltaic effect. In particular, at the optimal doping concentration (xopt?~?0.125) the sample reveals a remarkably high photogenerated field EOC?=?320?V/cm (VOC?=?16?V), highest ever reported in any bulk polycrystalline non-centrosymmetric systems. The band structure, examined through DFT calculations, suggests that the shift current mechanism is key to explain the large enhancement in photovoltaic effect in this family.