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

Yifan Zheng, Jaemin Kong, Di Huang, Wei Shi, Lyndsey Mcmillon-Brown, Howard E. Katz, Junsheng Yu, André D. Taylor

Research output: Contribution to journalArticlepeer-review

Abstract

The p-i-n structure for perovskite solar cells has recently shown significant advantages in minimal hysteresis effects, and scalable manufacturing potential using lowerature 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%.

Original languageEnglish (US)
Pages (from-to)11342-11348
Number of pages7
JournalNanoscale
Volume10
Issue number24
DOIs
StatePublished - Jun 28 2018

ASJC Scopus subject areas

  • Materials Science(all)

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