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2018 ; 8
(1
): 8005
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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[May]; 8
(1
): 8005
PMID29789634
show 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 (V(OC))
higher than the bandgap, gain tremendous importance as next generation
photovoltaic materials. Here a non-toxic co-doped Ba(1-x)(Bi(0.5)Li(0.5)) (x)
TiO(3) 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 (x (opt) ?~?0.125) the sample reveals a remarkably
high photogenerated field E(OC)?=?320?V/cm (V(OC)?=?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.