Perovskite solar cell with EDTA-2na modified electron transport layer and preparation method thereof

Abstract

This invention relates to a perovskite solar cell with an EDTA-2Na modified electron transport layer and its fabrication method, belonging to the field of perovskite solar cells. The perovskite solar cell comprises, from bottom to top: a substrate, a transparent conductive electrode, an electron transport layer, a perovskite absorber layer, a hole transport layer, a molybdenum oxide layer, and a top metal electrode. The electron transport layer material is EDTA-2Na modified SnO2. This invention uses EDTA-2Na to modify the SnO2 electron transport layer. On the one hand, the carboxyl groups in EDTA-2Na can effectively passivate the hydroxyl groups formed on the SnO2 surface due to oxygen vacancies through esterification; on the other hand, the Na in EDTA-2Na… + It can penetrate into the perovskite layer through thermal diffusion, thereby passivating the negative charge defects therein, reducing non-radiative recombination caused by defects, and significantly improving the photoelectric conversion efficiency and open-circuit voltage of EDTA-2Na modified perovskite solar cells.

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