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 G. Allen, Shuai Yuan, Ahmad R. Kirmani, Kyle N. Baustert, Michael F. Salvador, Bekir Turedi, Abdullah Y. Alsalloum, Khulud Almasabi, Konstantinos Kotsovos, Issam Gereige, Liang Sheng Liao, Joseph M. Luther, Kenneth R. GrahamOmar F. Mohammed, Stefaan De Wolf, Osman M. Bakr

Research output: Contribution to journalArticlepeer-review

17 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) (DPITPFB) 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 languageEnglish
Pages (from-to)1987-1993
Number of pages7
JournalACS Energy Letters
Issue number6
StatePublished - Jun 10 2022

Bibliographical note

Publisher Copyright:
© 2020 American Chemical Society.

ASJC Scopus subject areas

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


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