Interface Molecular Engineering for Laminated Monolithic Perovskite/Silicon Tandem Solar Cells with 80.4% Fill Factor

C.O. Ramírez Quiroz, G.D. Spyropoulos, M. Salvador, L.M. Roch, M. Berlinghof, J. Darío Perea, K. Forberich, L.-I. Dion-Bertrand, N.J. Schrenker, A. Classen, N. Gasparini, G. Chistiakova, M. Mews, L. Korte, B. Rech, N. Li, F. Hauke, E. Spiecker, Ludwig-Maximilians-Universität LMU, S. AlbrechtG. Abellán, S. León, T. Unruh, A. Hirsch, A. Aspuru-Guzik, C.J. Brabec

Research output: Contribution to journalArticlepeer-review


A multipurpose interconnection layer based on poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonate) (PEDOT:PSS), and d-sorbitol for monolithic perovskite/silicon tandem solar cells is introduced. The interconnection of independently processed silicon and perovskite subcells is a simple add-on lamination step, alleviating common fabrication complexities of tandem devices. It is demonstrated experimentally and theoretically that PEDOT:PSS is an ideal building block for manipulating the mechanical and electrical functionality of the charge recombination layer by controlling the microstructure on the nano- and mesoscale. It is elucidated that the optimal functionality of the recombination layer relies on a gradient in the d-sorbitol dopant distribution that modulates the orientation of PEDOT across the PEDOT:PSS film. Using this modified PEDOT:PSS composite, a monolithic two-terminal perovskite/silicon tandem solar cell with a steady-state efficiency of 21.0%, a fill factor of 80.4%, and negligible open circuit voltage losses compared to single-junction devices is shown. The versatility of this approach is further validated by presenting a laminated two-terminal monolithic perovskite/organic tandem solar cell with 11.7% power conversion efficiency. It is envisioned that this lamination concept can be applied for the pairing of multiple photovoltaic and other thin film technologies, creating a universal platform that facilitates mass production of tandem devices with high efficiency. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Original languageEnglish
JournalAdvanced Functional Materials
Issue number40
Publication statusPublished - 2019


  • Adhesives
  • Alcohols
  • Cell engineering
  • Conducting polymers
  • Density functional theory
  • Efficiency
  • Laminating
  • Molecular dynamics
  • Open circuit voltage
  • Perovskite
  • Styrene
  • lamination
  • Mechanical and electrical
  • monolithic tandem
  • Open circuit voltage loss
  • Poly(styrene sulfonate)
  • Poly-3
  • 4-ethylenedioxythiophene
  • Power conversion efficiencies
  • Transparent conductive
  • Perovskite solar cells


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