Minimizing Current and Voltage Losses to Reach 25% Efficient Monolithic Two-Terminal Perovskite-Silicon Tandem Solar Cells

Kevin A. Bush, Salman Manzoor, Kyle Frohna, Zhengshan Yu, James A. Raiford, Axel F. Palmstrom, Hsin Ping Wang, Rohit Prasanna, Stacey F. Bent, Zachary Holman, Michael D. McGehee

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52 Scopus citations

Abstract

The rapid rise in efficiency and tunable bandgap of metal-halide perovskites makes them highly attractive for use in tandems on silicon. Recently we demonstrated a perovskite-silicon monolithic two-terminal tandem with 23.6% power conversion efficiency. Here, we present work on optical optimization to improve light harvesting that includes thinning out the top transparent electrode to reduce front-surface reflection and parasitic absorption; introducing metal fingers to minimize series resistance losses; and further minimizing reflection loss with a polydimethylsiloxane (PDMS) stamp with random, pyramidal texture. Additionally, to reduce voltage loss while achieving current matching, we employ poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) as a hole transport material instead of NiOx and a wider 1.68 eV bandgap perovskite composition. These optimizations boost the open-circuit voltage to 1.77 V and the short-circuit current density to 18.4 mA/cm2, culminating in a 25% efficient perovskite-silicon tandem with a 1 cm2 active area.

Original languageEnglish (US)
Pages (from-to)2173-2180
Number of pages8
JournalACS Energy Letters
Volume3
Issue number9
DOIs
StatePublished - Sep 14 2018

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ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

Cite this

Bush, K. A., Manzoor, S., Frohna, K., Yu, Z., Raiford, J. A., Palmstrom, A. F., Wang, H. P., Prasanna, R., Bent, S. F., Holman, Z., & McGehee, M. D. (2018). Minimizing Current and Voltage Losses to Reach 25% Efficient Monolithic Two-Terminal Perovskite-Silicon Tandem Solar Cells. ACS Energy Letters, 3(9), 2173-2180. https://doi.org/10.1021/acsenergylett.8b01201