Two-dimensional (n = 1) ferroelectric film solar cells

Abstract

Molecular ferroelectrics with excellent ferroelectric properties and a low processing temperature, a narrow bandgap, and light weightiness have shown great potential in the photovoltaic field. However, two-dimensional (2D) perovskite solar cells with high tunability, excellent photo-physical properties, and superior long-term stability are limited by the poor out-of-plane conductivity from intrinsic multi-quantum well electronic structures. This work uses 2D molecular ferroelectric as the absorbing layer to break the limit of multiple quantum wells. Our 2D ferroelectric solar cells achieve the highest open-circuit voltage (1.29 V) and the best efficiency (3.71%) among the 2D (n = 1) Ruddlesden–Popper perovskite solar cells due to the enhanced out-of-plane charge transport induced by molecular ferroelectrics with a strong saturation polarization, high Curie temperature, and multiaxial characteristics. This work aims to break the inefficient out-of-plane charge transport caused by the limit of multi-quantum well electronic structure and improve the efficiency of 2D ferroelectric solar cells.

Two-Dimensional Molecular Ferroelectric Thin Films for Polarization-Driven Tunable Photovoltaic Devices with High Photocurrent Density

“…As shown in Figure e, after polarization with an applied voltage of 0.6 V, the V OC of the device prepared with a precursor solution of 0.2 mol/L increased to 1.198 V, and the J SC increased to 1.055 mA/cm 2 , indicating that the device can achieve multiple adjustments of photovoltaic performance after polarization with different applied electric fields. This is consistent with previous reports on ferroelectric (4,4-difluoropiperidinium) 2 PbI 4 . In Figure , the hysteresis of the photovoltaic performance of the device increases with the increase in film thickness.…”

“…This is consistent with previous reports on ferroelectric (4,4-difluoropiperidinium) 2 PbI 4 . 46 In Figure 4, the hysteresis of the photovoltaic performance of the device increases with the increase in film thickness. If the hysteresis is related to the ferroelectric properties of the film, the change in photovoltaic performance of the polarized film should be consistent with the amplitude of the hysteresis change.…”

Perovskite solar cells with ferroelectricity

“…(D) The J – V curves based on 2D (DFPD) 2 PbI 4 ferroelectric PSCs before and after positive poling. Reproduced under terms of the CC‐BY license 69 . Copyright 2023, Oxford University Press.…”

“…Zou et al developed a 2D perovskite solar cell that employs a two-dimensional molecular ferroelectrics (4,4-difluoropiperidinium) 2 PbI 4 as an absorption layer, breaking through the limitations of multiple quantum wells by out-plane ferroelectric polarization (Figures 8A,B). 69 After positive poling, the surface potential of the ferroelectric layer decreased by about −311 mV (non-ferroelectric (PEA) 2 PbI 4 has little changes) with a 1 V bias voltage for 300 s (Figure 8C), leading to improved photoelectric performance of ferroelectric PSCs. This change is mainly attributed to the charge accumulation/photo-generated charge transport on the surface under the depolarization field promotion.…”

Recent progress of organic artificial synapses in biomimetic sensory neural systems

“…111 Researchers have found that molecular ferroelectrics (MFs) display high ferroelectricity and a field amplification effect, indicating their potential in neuromorphic devices. 112,113 Cai et al introduced a 2T ferroelectric synaptic device utilizing a MF/semiconductor interface, as illustrated in Fig. 4(e).…”