Switchable photovoltaic properties of multiferroic KBiFe 2 O 5

Investigation of KBiFe2O5 as a Photovoltaic Absorber

“…When focussing on PV properties the short-circuit current density, open circuit voltage and fill factor were 2.8 µA/cm², 155 mV and 42% respectively. This short-circuit current density is about 5-7 times lower than references (12) and (13). It should be noted that the active area defined to convert the short-circuit current into a short-circuit current density has been taken as 1 mm², which is reasonable as the BFKO film is highly resistive and therefore the areas outside the ITO pad cannot contribute to the current.…”

Analysis of the thermal stability and optical properties of KBiFe2O5perovskite obtained by a polymeric precursor method

“…In the study by Vavilapalli et al., 51 the best temperature to obtain KBFO without secondary phases was at 650°C, but at 750°C the decomposition process began with a decrease in the intensity of the peaks and the formation of secondary phases of the pyrochlore type. Similarly, the study of Jalaja and Dutta 16 showed the formation of the pyrochlore phase at 800°C.…”

“…This loss of homogeneity presents difficulties for its photovoltaic application because the secondary phases capture the charge carriers responsible for energy conversion and make it impossible to extract its full application potential for solar devices. [12][13][14] Some studies have shown this secondary phase formation; in the study by Zhang et al 15 KBFO was synthetized by solid-state reaction and begins to lose its stoichiometry approximately at 850 • C, while in Vavilapali et al 18 KBFO was synthetized by multiple-step solid-state reaction, this strategy was done to decrease the synthesis temperature, but the phase decomposition continued to occur around 750 • C. The first chemical synthesis by wet route was reported by Jalaja and Dutta, 16 which employed the sol-gel technique to synthetized KBFO. Despite all the advantages of the wet synthesis routes, KBFO begins to decompose at 800 • C to form a pyrochlore phase.…”

“…KBFO was synthetized by multiple‐step solid‐state reaction, this strategy was done to decrease the synthesis temperature, but the phase decomposition continued to occur around 750°C. The first chemical synthesis by wet route was reported by Jalaja and Dutta, 16 which employed the sol–gel technique to synthetized KBFO. Despite all the advantages of the wet synthesis routes, KBFO begins to decompose at 800°C to form a pyrochlore phase.…”

Bismuth ferrite materials for solar cells: Current status and prospects

“…However, completely different from traditional p-n junction photovoltaic effects, for ferroelectric (FE) photovoltaic effects, the photo-generated electron-hole pairs can be separated by the built-in electric field arising from the remnant polarization of the ferroelectric, as shown in Fig. 1 and thus, the Voc is not limited by the band gap of the ferroelectric material [21][22][23][24][25][26]. Besides, the remnant polarizationinduced built-in electric field is throughout the bulk region in ferroelectric, which is very helpful for the separation of electron-hole pairs, thus may result in large pho-tocurrent, and the photocurrent direction can be switched by changing the spontaneous polarization direction of the ferroelectric material [26].…”