2022 Adv. Mater., Over 24% PCE! How Do Highly Polarizable Organic Ferroelectric Materials Achieve Perovskite Doping?

SS-X solar simulator makes the breakthrough possible!
Top-Notch Due to It’s Precision!

　　Through selective doping materials, the built-in electric field (BEF) strength of silicon heterojunction solar cells can be easily increased and high power conversion efficiency (PCE) can be achieved. However, applying this approach to perovskite solar cells (pero-SCs) is challenging because the controllability of perovskite doping is difficult to achieve.

　　Advanced Materials (IF 30.849) published a study in February 2022 on enhancing the built-in electric field (BEF) efficiency of perovskite solar cells by doping organic ferroelectric materials. The research team enhanced the BEF of the FA_0.92MA_0.08PbI₃ perovskite by doping an organic ferroelectric material with high polarizability: poly(vinylidene fluoride): dabcoHReO₄ (PVDF:DH). The polarization of PVDF:DH generated an additional electric field that is permanently maintained in the direction consistent with the BEF of the perovskite solar cell. The BEF superposition can more sufficiently drive the transport and extraction of charge-carriers, suppressing the nonradiative recombination that occurs in perovskite solar cells.

　　All perovskite solar cell PCE value tests were performed through the SS-F5-3A solar simulator (now SS-X Solar Simulator). The external quantum efficiency (EQE) was tested with the QE-R quantum efficiency measurement system. The results showed that the PVDF:DH dopant was beneficial to the formation of PbI₂ films, thereby promoting the growth of perovskites with high crystallinity and a few defects. The study confirmed that the 0.062 cm² perovskite achieved a remarkable 24.23% PCE. Besides, the 1 cm² perovskite achieved a high PCE of 22.69%. This study simultaneously improved moisture resistance and operational stability.

　　In addition to the EQE (External Quantum Efficiency) spectrum analysis of solar cells, the Quantum Efficiency Measurement System of Enlitech also provides J_sc (short-circuit current density) comparison for the short-circuit current of solar cells under the solar simulator to prove the authenticity of the experiment. The solar simulator and KA-6000 software of Enlitech also provide monitoring of the short-circuit current over time to prove the stability of the solar cell!