Grain Engineering for Perovskite/Silicon Monolithic Tandem Solar Cells with Efficiency of 25.4%

Bo Chen, Zhengshan Yu, Kong Liu, Xiaopeng Zheng, Ye Liu, Jianwei Shi, Derrek Spronk, Peter N. Rudd, Zachary Holman, Jinsong Huang

Research output: Contribution to journalArticlepeer-review

117 Scopus citations

Abstract

Organic-inorganic halide perovskites are promising semiconductors to mate with silicon in tandem photovoltaic cells due to their solution processability and tunable complementary bandgaps. Herein, we show that a combination of two additives, MACl and MAH 2 PO 2 , in the perovskite precursor can significantly improve the grain morphology of wide-bandgap (1.64–1.70 eV) perovskite films, resulting in solar cells with increased photocurrent while reducing the open-circuit voltage deficit to 0.49–0.51 V. The addition of MACl enlarges the grain size, while MAH 2 PO 2 reduces non-radiative recombination through passivation of the perovskite grain boundaries, with good synergy of functions from MACl and MAH 2 PO 2 . Matching the photocurrent between the two sub-cells in a perovskite/silicon monolithic tandem solar cell by using a bandgap of 1.64 eV for the top cell results in a high tandem V oc of 1.80 V and improved power conversion efficiency of 25.4%.

Original languageEnglish (US)
Pages (from-to)177-190
Number of pages14
JournalJoule
Volume3
Issue number1
DOIs
StatePublished - Jan 16 2019

Keywords

  • additive
  • grain engineering
  • perovskite
  • solar cell
  • tandem
  • wide bandgap

ASJC Scopus subject areas

  • Energy(all)

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