[1] L JIN, X TANG, D SONG et al. Annealing temperature effects on (111)-oriented BiFeO₃ thin films deposited on Pt/Ti/SiO₂/Si by chemical solution deposition. Journal of Materials Chemistry C, 10742(2015).

[2] M XIAO, S LI, Z LEI, of Study. 111)-oriented PZT thin films prepared by a modified Sol-Gel method. Journal of Materials Science: Materials in Electronics, 4031(2015).

[3] Z LI, Y ZHAO, W L LI et al. Photovoltaic effect induced by self- polarization in BiFeO₃ films. The Journal of Physical Chemistry C, 9411(2021).

[4] Y ZHANG, H ZHENG, X WANG et al. Enhanced photovoltaic properties of gradient calcium-doped BiFeO₃ films. Ceramics International, 10083(2020).

[5] Y LI, X CUI, M TIAN et al. Stable photovoltaic output and optically tunable resistive switching in all-inorganic flexible ferroelectric thin film with self-polarization characteristic. Acta Materialia, 117173(2021).

[6] Y HOU, R HAN, Y LIU et al. Enhanced piezoelectric properties in Li_xBi_1-xNb_xFe_1-xO₃ films contributed by low-symmetry phase and self-polarization. Ceramics International, 3723(2019).

[7] Y LIU, L DING, L DAI et al. All-ceramic flexible piezoelectric energy harvester. Advanced Functional Materials, 2209297(2022).

[8] D ZOU, S LIU, C ZHANG et al. Flexible and translucent PZT films enhanced by the compositionally graded heterostructure for human body monitoring. Nano Energy, 85: 105984(2021).

[9] X CHEN, Y ZOU, G YUAN et al. Temperature gradient introduced ferroelectric self-poling in BiFeO₃ ceramics. Journal of the American Ceramic Society, 3788(2013).

[10] C LICHTENSTEIGER, C WEYMANN, S FERNANDEZ-PENA et al. Built-in voltage in thin ferroelectric PbTiO₃ films: the effect of electrostatic boundary conditions. New Journal of Physics, 043030(2016).

[11] D FONG, A KOLPAK, J EASTMAN et al. Stabilization of monodomain polarization in ultrathin PbTiO₃ films. Physical Review Letters, 127601(2006).

[12] D PANTEL, S GOETZE, D HESSE et al. Room-temperature ferroelectric resistive switching in ultrathin Pb(Zr_0.2Ti_0.8)O₃ films. ACS Nano, 6032(2011).

[13] R GUO, L SHEN, H WANG et al. Tailoring self-polarization of BaTiO₃ thin films by interface engineering and flexoelectric effect. Advanced Materials Interfaces, 1600737(2016).

[14] Y F HOU, T D ZHANG, W L LI et al. Self-polarization induced by lattice mismatch and defect dipole alignment in (001) BaTiO₃/LaNiO₃ polycrystalline film prepared by magnetron sputtering at low temperature. RSC Advances, 61821(2015).

[15] J ZHAO, W REN, G NIU et al. Recoverable self-polarization in lead-free bismuth sodium titanate piezoelectric thin films. ACS Applied Materials & Interfaces, 28716(2017).

[16] J ZHAO, G NIU, W REN et al. Self-polarization in epitaxial fully matched lead-free bismuth sodium titanate based ferroelectric thin films. ACS Applied Materials & Interfaces, 23945(2018).

[17] J ZHAO, G NIU, W REN et al. Polarization behavior of` lead-free 0.94(Bi_0.5Na_0.5)TiO₃-0.06BaTiO₃ thin films with enhanced ferroelectric properties. Journal of the European Ceramic Society, 3928(2020).

[18] B C JEON, D LEE, M H LEE et al. Flexoelectric effect in the reversal of self-polarization and associated changes in the electronic functional properties of BiFeO₃ thin films. Advanced Materials, 5643(2013).

[19] Y HOU, W LI, T ZHANG et al. Large piezoelectric response induced by the coexistence of low-symmetry and self-polarization in Li⁺-Nb⁵⁺-doped BiFeO₃ polycrystalline films. The Journal of Physical Chemistry C, 6246(2016).

[20] M F CHISHOLM, W LUO, M P OXLEY et al. Atomic-scale compensation phenomena at polar interfaces. Physical Review Letters, 197602(2010).

[21] C LIU, Y LIU, B ZHANG et al. Ferroelectric self-polarization controlled magnetic stratification and magnetic coupling in ultrathin La_0.67Sr_0.33MnO₃ films. ACS Applied Materials & Interfaces, 30137(2021).

[22] Y H CHU, M P CRUZ, C H YANG et al. Domain control in multiferroic bifeo₃ through substrate vicinality. Advanced Materials, 2662(2007).

[23] S H BAEK, H W JANG, C M FOLKMAN et al, 309(2010).

[24] J CHEN, Y LUO, X OU et al. Upward ferroelectric self-polarization induced by compressive epitaxial strain in (001) BaTiO₃ films. Journal of Applied Physics, 204105(2013).

[25] J WU, Z FAN, D XIAO et al. Multiferroic bismuth ferrite-based materials for multifunctional applications: ceramic bulks, thin films and nanostructures. Progress in Materials Science, 84: 335(2016).

[26] X LI, L ZHANG, N LUO et al. Enhanced H₂S sensing performance of BiFeO₃ based MEMS gas sensor with corona poling. Sensors and Actuators B: Chemical, 131477(2022).

[27] M CAMPANINI, R ERNI, C YANG et al. Periodic giant polarization gradients in doped BiFeO₃ thin films. Nano Letters, 717(2018).

[28] S CHAUHAN, M KUMAR, S CHHOKER et al. Substitution driven structural and magnetic transformation in Ca-doped BiFeO₃ nanoparticles. RSC Advances, 43080(2016).

[29] L JIN, X TANG, R WEI et al. BiFeO₃(00l)/LaNiO₃/Si thin films with enhanced polarization: an all-solution approach. RSC Advances, 78629(2016).

[30] E KHOMYAKOVA, M SADL, H URSIC et al. Self-poling of BiFeO₃ thick films. ACS Applied Materials & Interfaces, 19626(2016).