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Spray coating of the PCBM electron transport layer significantly improves the efficiency of p-i-n planar perovskite solar cells

Abstract

The P-I-N structure for perovskite solar cells has recently shown significant advantages in minimal hysteresis effects, and scalable manufacturing potential using low-temperature solution processing. However, the power conversion efficiency (PCE) of the perovskite p-i-n structure remains low mainly due to limitations using a flat electron transport layer (ETL). In this work, we demonstrate a new approach using spray coating to fabricate the [6,6]-phenyl-C(61)-butyric acid methyl ester (PCBM) ETL. By creating a rough surface, we effectively improve the light trapping properties inside the PCBM ETL. We reveal that the spray coated PCBM can form a cross-linked network which may facilitate better charge transport and enhance extraction efficiency. By improving the contact between the perovskite film and the PCBM ETL, a reduction in the trap states is observed resulting in a PCE increase from 13% to > 17%.

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Publication details

The article was accepted on 29 Mar 2018 and first published on 02 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR01763H
Citation: Nanoscale, 2018, Accepted Manuscript
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    Spray coating of the PCBM electron transport layer significantly improves the efficiency of p-i-n planar perovskite solar cells

    Y. Zheng, J. Kong, H. Di, W. Shi, L. McMillon-Brown, H. E. Katz, J. Yu and A. Taylor, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR01763H

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