Abstract
Ferroelectrics have been attracting increasing attention as good candidates for multifunctional materials because of their fascinating properties. However, their large bandgap has been a roadblock limiting their application in optoelectronics and photovoltaics, among other applications. Hybrid ferroelectrics have the potential to combine the advantages of both molecular materials and ferroelectrics. In this context, we designed a hybrid ferroelectric: (2-(ammoniomethyl)pyridinium)SbI5. It shows an above-room-temperature Curie temperature (Tc=360 K), a large spontaneous polarization (Ps=4 μC cm−2) and a small bandgap (2.03 eV) that is much smaller than the recently reported 2.7–3.65 eV for the lead-halide perovskite ferroelectrics. The implementation of ferroelectricity in hybrid semiconducting materials may be a feasible way to realize high-performance ferroelectric optoelectronic and photovoltaic devices.
Highlights
Intensive research on photovoltaic (PV) materials over the past six decades has been driven by the increasingly serious energy crisis
The past few years have seen the renaissance of photoferroelectric materials for PV applications.[9,10,11,12]
Photoferroelectric materials, such as BiFeO3 and SbSI, are semiconducting ferroelectrics that show both photosensitive and ferroelectric properties. They adopt a newly described mechanism known as the anomalous PV effect, where photogenerated electrons and holes are directly separated by the spontaneous electric field from the intrinsic ferroelectric polarization, resulting in an open circuit voltage above the bandgap
Summary
Intensive research on photovoltaic (PV) materials over the past six decades has been driven by the increasingly serious energy crisis. The past few years have seen the renaissance of photoferroelectric materials for PV applications.[9,10,11,12] Photoferroelectric materials, such as BiFeO3 and SbSI, are semiconducting ferroelectrics that show both photosensitive and ferroelectric properties. They adopt a newly described mechanism known as the anomalous PV effect, where photogenerated electrons and holes are directly separated by the spontaneous electric field from the intrinsic ferroelectric polarization, resulting in an open circuit voltage above the bandgap. The power conversion efficiency of conventional inorganic ferroelectrics remains low because of the poor light absorption ability that is limited by their large bandgaps
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