First Demonstration of Top Contact-Free Perovskite/Silicon Two-Terminal Tandem Solar Cells for Overcoming the Current Density Hurdle

Dowon Pyun, Sang Won Lee, Youngwoong Kim, Gyeong Sun Jang, Dongjin Choi, Seok Hyun Jeong, Hoyoung Song, Solhee Lee, Sujin Cho, Jiryang Kim, Dongkyun Kang, Ha Eun Lee, Ji Yeon Hyun, Changhyun Lee, Hyun Jung Park, Jae Keun Hwang, Wonkyu Lee, Nam Joong Jeon, Jangwon Seo, Yoonmook KangDonghwan Kim, Hae Seok Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Current density plays a substantial role in monolithic tandem solar cells; however, it is difficult to control because subcells and auxiliary layers are stacked and serially connected vertically to obtain higher voltages. The vertically stacked structure intrinsically triggers inevitable parasitic absorption. In current typical perovskite/silicon two-terminal (2-T) tandem solar cells, 5-10 layers are placed on the light path, even though they are not current generating layers. These layers usually include transparent window layers, buffer layers, carrier extraction layers, and recombination layers. Therefore, the development of top contact-free architectures to reduce parasitic absorption in 2-T tandem solar cells is required for achieving high efficiency. In this study, a top contact-free perovskite/silicon 2-T tandem solar cell with quasi-interdigitated intermediate electrodes (Q-IDIEs) is reported for the first time. Several layers placed above the perovskite layer in conventional devices are relocated to the backside of the perovskite. The Q-IDIE, composed of a patterned Ni/NiOX shell above the full-deposited TiO2, was fabricated by the following processes: photolithography, lift-off, and oxidation. The device results in 4.23% efficiency with an open-circuit voltage of 1.54 V. This tandem architecture is expected to be a breakthrough for overcoming the theoretical efficiency limit of single-junction solar cells with further optimization.

Original languageEnglish
Pages (from-to)2687-2697
Number of pages11
JournalACS Applied Energy Materials
Issue number5
Publication statusPublished - 2023 Mar 13

Bibliographical note

Publisher Copyright:
© 2023 American Chemical Society.


  • Ni oxidation
  • honeycomb-shaped
  • parasitic absorption
  • quasi-interdigitated intermediate electrode
  • tandem solar cells
  • top contact-free

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering


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