Highly efficient monolithic perovskite/CIGSe tandem solar cells on rough bottom cell surfaces

Marko Jost, Tobias Bertram, DIbyashree Koushik, Jose A. Marquez, Marcel A. Verheijen, Marc Daniel Heinemann, Eike Kohnen, Amran Al-Ashouri, Bernd Rech, Thomas Unold, Mariadriana Creatore, Iver Lauermann, Christian A. Kaufmann, Rutger Schlatmann, Steve Albrecht

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

2 Citations (Scopus)
1 Downloads (Pure)


We present a new strategy for highly efficient perovskite/CIGSe monolithic tandem solar cells, fabricated directly on top of a rough CIGSe surface. This was enabled by conformally depositing the metal oxide NiOx by atomic layer deposition, as confirmed by TEM/EDX measurements. The resulting limiting NiOx/perovskite interface was improved by spin-coating additional thin layer of p-type polymer PTAA, thus forming a NiOx/PTAA hole selective bilayer. The fabricated tandem device has a 21.6% power conversion efficiency on 0.778 cm2, stable over 10 minutes of maximum power point tracking. The device performance is further analyzed by absolute photoluminescence measurements from which a VOC contribution of each subcell to the tandem VOC can be estimated.

Original languageEnglish
Title of host publication2019 IEEE 46th Photovoltaic Specialists Conference, PVSC 2019
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Number of pages5
ISBN (Electronic)9781728104942
Publication statusPublished - Jun 2019
Event46th IEEE Photovoltaic Specialists Conference, PVSC 2019 - Chicago, United States
Duration: 16 Jun 201921 Jun 2019


Conference46th IEEE Photovoltaic Specialists Conference, PVSC 2019
Country/TerritoryUnited States


  • conformal hole transport layers
  • NiO
  • perovskite solar cells
  • perovskite/CIGS tandem solar cell
  • photovoltaics


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