Abstract
The depolarization field of ferroelectric photovoltaic materials can enhance the separation and transport of photogenerated carriers, which will improve the performance of photovoltaic devices, thus attracting the attention of researchers. In this paper, a narrow bandgap molecular ferroelectric Hexane-1,6-diammonium pentaiodobismuth (HDA-BiI5) was selected as the photo absorption layer for the fabrication of solar cells. After optimizing the ferroelectric thin film by the antisolvent process, the effect of different polarization voltages on the performance of ferroelectric devices was studied. The results showed that there was a significant increase in short-circuit current density, and the photoelectric conversion efficiency showed an overall increasing trend. Finally, we analyzed the internal mechanism of the effect of polarization on the device.
Highlights
Ferroelectric materials have come to the attention of researchers because of their ferroelectric photovoltaic effect, a phenomenon that modulates photovoltaic states through polarization [1,2,3]
The ideal band gap range for materials used in solar cells is 1 to 1.5 electron volts, while the band gap is wider for ferroelectric photovoltaic materials
Basu et al obtained the shortcircuit current of 13.4 μA/cm2 in the device based on BiFeO3, a ferroelectric material [5]
Summary
Ferroelectric materials have come to the attention of researchers because of their ferroelectric photovoltaic effect, a phenomenon that modulates photovoltaic states through polarization [1,2,3]. Dong et al obtained devices based on this material with short-circuit current density and open-circuit voltage of 0.13 × 10−3 A/cm and 0.65 V, respectively [6]. Since the study of HDA-BiI5 is still in its infancy, there are no reports on the photovoltaic performance of the polarized inverted devices based on this material. Optimization of the film quality using the antisolvent process is a very critical step to improve the device performance [14,15], the effect of different polarization voltages on the device open circuit voltage, short circuit current density, fill factor and PCE before and after optimization using chlorobenzene as an antisolvent was investigated. The dried ITO glass substrate was put into a drawer-type UV light washer and treated with UV ozone for 15 min to eliminate organic impurities and improve hydrophilicity
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