Photoactivated p-Doping of Organic Interlayer Enables Efficient Perovskite/Silicon Tandem Solar Cells

Xiaopeng Zheng, Jiang Liu, Tuo Liu, Erkan Aydin, Min Chen, Wenbo Yan, Michele De Bastiani, Thomas Allen, Shuai Yuan, Ahmad Kirmani, Kyle Baustert, Michael Salvador, Bekir Turedi, Abdullah Alsalloum, Khulud Almasabi, Konstantinos Kotsovos, Issam Gereige, Liang-Sheng Liao, Joseph Luther, Kenneth GrahamOmar Mohammed, Stefaan De Wolf, Osman Bakr

Research output: Contribution to journalArticlepeer-review

18 Scopus Citations


Solution-processed organic semiconductor layers on rough surfaces tend to vary widely in thickness, significantly hindering charge extraction in relevant optoelectronic devices. Herein, we report the photoactivated p-doping of hole-transporting material (HTM) to enhance hole extraction for (textured) perovskite/silicon tandem solar cells, making the device performance less sensitive to the variation of hole transport layer thickness. We used the ionic compound 4-isopropyl-4'-methyldiphenyliodonium tetrakis(penta-fluorophenyl-borate) (DPI-TPFB) as a p-type dopant in poly(triaryl amine) (PTAA), which we used as the HTM. We observed that light soaking DPI-TPFB-doped PTAA shows approximately 22 times higher conductivity compared with an undoped PTAA film, which translated into an improved fill factor (FF) for tandem solar cells. Our tandem solar cells achieved an ~80% FF and 27.8% efficiency and operated at their maximum power point for 200 h without loss of performance, in addition to retaining ~83% of initial performance over a month of operation in an outdoor environment.
Original languageAmerican English
Pages (from-to)1987-1993
Number of pages7
JournalACS Energy Letters
Issue number6
StatePublished - 2022

NREL Publication Number

  • NREL/JA-5900-82546


  • efficiency
  • perovskite
  • poly(triaryl amine)
  • PTAA
  • tandem solar cells


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