Piezophototronic Effect Enhanced Perovskite Solar Cell Based on P(VDF‐TrFE)

Abstract

As a candidate for next‐generation solar devices, perovskite solar cells are increasingly being studied for their rapid increased power conversion efficiency (PCE). One of the possible routes to further increase PCE is the introduction of polarization in the absorption layer which functions as a method for increasing the built‐in potential and reducing the interface barrier, leading to much improved carrier separation and extraction. This technique uses the principle of the piezophototronic effect utilized for obtaining enhanced optoelectronic performances. Herein, to introduce internal polarization while maintaining optical absorption performance of the perovskite, organic–inorganic hybrid perovskite composite film solar cells are fabricated by doping polarized polyvinylidenefluoride‐co‐trifluoroethylene (P(VDF‐TrFE)) into the perovskite. The composite film is polarized with an external potential, subsequently inducing the piezophototronic effect to enhance the performances of perovskite solar cells. Experimental results show that this simple polarization method has effectively improved several key characteristics of the solar cell. The PCE has reached up to 22.1%, the short‐circuit current (Jsc) increases to 24.2 mA cm−2, and the open‐circuit voltage (Voc) increases to 1.18 V.

Optical properties of PVDF-TrFE and PVDF-TrFE-CTFE films in terahertz band

“…Upon incorporating a ferroelectric polymer power conversion efficiencies and internal quantum efficiencies are increased by nearly 50%, and 100% respectively [19]. Doping of PVDF-TrFE into perovskites has produced power conversion efficiency more than 20% [20]. The use of this copolymer as a processing additive in perovskite cells can show improved average power conversion efficiency up to 12.54 ± 0.40% under a standard illumination of 100 milliwatts per square centimeter [21].…”

Photoferroelectric Perovskite Synapses for Neuromorphic Computing

“…Therefore, P(VDF-TrFE) can improve the crystallization of perovskite crystal and promote the formation of uniform large grain crystal film, which is in accordance with the previous articles. [46,47] Meanwhile, atomic force microscopy (AFM) was used to investigate the surface smoothness of these films, and the 3D AFM images (5 μm × 5 μm) are displayed in Figure 1g (corresponding 2D images of Figure S1, Supporting Information). On the whole, both of these films have good smoothness and the roughness values are ≈9.89 and ≈8.28 nm for pristine and PFEP films, respectively (Figure 1h).…”

Advances on the Application of Wide Band‐Gap Insulating Materials in Perovskite Solar Cells

“…[143] PVDF and its copolymer poly(vinylidene fluoride trifluoroethylene) (P(VDF-TrEF)) are ferroelectric materials, which are easy to be polarized under the action of an electric field and induce piezoelectric photoelectric effect, [144] and the generated additional electric field promotes carrier separation and transport. [145] In addition, because PVDF has a long flexible polymer chain, adding it into the perovskite precursor solution can help the precursor solution diffuse on the substrate to form a uniform film. [44a] Zhang et al added ferroelectric P(VDF-TrEF) into perovskite precursor solution, which not only effectively enhance the build-in electric field, but also regulate the crystallization process of perovskite.…”