The ferroelectric material of BaTiO3 was introduced in the electron transport layer (ETL) of perovskite solar cells to improve the photogenerated electron transport. The sintered BaTiO3 thin films were polarized at different applied electric fields, and then TiO2 thin films were further deposited to be used as the ETL. The electric field was positively applied across the BaTiO3 thin film, and the photocurrent density of solar cell can be increased obviously. The results of electrochemical impedance and photoluminescence spectra indicate that the ordered polarization dipole moment inside the BaTiO3 thin film can accelerate the transport of photogenerated electrons from the ETL to the conducting glass substrate. The short-circuit photocurrent of perovskite solar cell is increased and thus the light-to-electric conversion efficiency is effectively improved to 13%. It is increased by 14% compared with that without the application of the positive electric field across the BaTiO3 thin film.

将BaTiO 3的铁电材料引入钙钛矿太阳能电池的电子传输层（ETL）中，以改善光生电子传输。将烧结的BaTiO 3薄膜在不同的施加电场下极化，然后进一步沉积TiO 2薄膜作为ETL。正电场施加在整个BaTiO 3薄膜上，可以明显增加太阳能电池的光电流密度。电化学阻抗和光致发光光谱的结果表明，BaTiO 3内部的有序极化偶极矩薄膜可以加速光生电子从ETL到导电玻璃基板的传输。钙钛矿太阳能电池的短路光电流增加，因此光电转换效率有效地提高到13％。与未在整个BaTiO 3薄膜上施加正电场的情况相比，它增加了14％。