Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Surface passivation using n-type organic semiconductor in two-dimensional perovskite solar cells

Version 1 : Received: 6 June 2021 / Approved: 7 June 2021 / Online: 7 June 2021 (16:15:59 CEST)

How to cite: Xie, X.; Zeng, F.; Wang, H.; Liu, G.; Xu, C.; Wu, S. Surface passivation using n-type organic semiconductor in two-dimensional perovskite solar cells. Preprints 2021, 2021060195 (doi: 10.20944/preprints202106.0195.v1). Xie, X.; Zeng, F.; Wang, H.; Liu, G.; Xu, C.; Wu, S. Surface passivation using n-type organic semiconductor in two-dimensional perovskite solar cells. Preprints 2021, 2021060195 (doi: 10.20944/preprints202106.0195.v1).

Abstract

Surface passivation, which has been intensively studied recently, is essential for the perovskite solar cells (PSCs), due to the intrinsic defects in perovskite crystal. A series of chemical or physical methods have been published for passivating the defects of perovskite, which effectively suppressed the charge recombination and enhanced the photovoltaic performance. In this study, the n-type semiconductor of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) is dissolved in chlorobenzene (CB) for the surface passivation during the spin-coating process for depositing the two-dimensional (2D) perovskite film. This approach simplifies the fabrication process of 2D PSCs and benefits the film quality. As a result, the defects of perovskite film are effectively passivated by this method. A better perovskite/PCBM heterojunction is generated, exhibiting an increased film coverage and improved film morphology of PCBM. It is found that this technology results in an improved electron transporting performance as well as suppressed charge recombination for electron transport layer. As a result, PSCs based on the one-step formed perovskite/PCBM heterojunctions exhibit the optimized power conversion efficiency of 15.69% which is about 37% higher than that of regular perovskite devices. The device environmental stability is also enhanced due to the quality-improved electron transport layer.

Subject Areas

perovskite solar cells, electron transport layer, 2D perovskite, anti-solvent

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