Zr‐Doped Indium Oxide (IZRO) Transparent Electrodes for Perovskite‐Based Tandem Solar Cells

Erkan Aydin* (Corresponding Author), Michele De Bastiani, Xinbo Yang, Muhammad Sajjad, Faisal Aljamaan, Yury Smirnov, Mohamed Nejib Hedhili, Wenzhu Liu, Thomas G. Allen, Lujia Xu, Emmanuel Van Kerschaver, Monica Morales-Masis, Udo Schwingenschlögl, Stefaan De Wolf (Corresponding Author)

*Corresponding author for this work

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Abstract

Parasitic absorption in transparent electrodes is one of the main roadblocks to enabling power conversion efficiencies (PCEs) for perovskite‐based tandem solar cells beyond 30%. To reduce such losses and maximize light coupling, the broadband transparency of such electrodes should be improved, especially at the front of the device. Here, the excellent properties of Zr‐doped indium oxide (IZRO) transparent electrodes for such applications, with improved near‐infrared (NIR) response, compared to conventional tin‐doped indium oxide (ITO) electrodes, are shown. Optimized IZRO films feature a very high electron mobility (up to ≈77 cm2 V−1 s−1), enabling highly infrared transparent films with a very low sheet resistance (≈18 Ω □−1 for annealed 100 nm films). For devices, this translates in a parasitic absorption of only ≈5% for IZRO within the solar spectrum (250–2500 nm range), to be compared with ≈10% for commercial ITO. Fundamentally, it is found that the high conductivity of annealed IZRO films is directly linked to promoted crystallinity of the indium oxide (In2O3) films due to Zr‐doping. Overall, on a four‐terminal perovskite/silicon tandem device level, an absolute 3.5 mA cm−2 short‐circuit current improvement in silicon bottom cells is obtained by replacing commercial ITO electrodes with IZRO, resulting in improving the PCE from 23.3% to 26.2%.
Original languageEnglish
Article number1901741
JournalAdvanced functional materials
Volume29
Issue number25
Early online date10 Apr 2019
DOIs
Publication statusPublished - 21 Jun 2019

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Keywords

  • high mobility
  • improved near-infrared response
  • indium zirconium oxide
  • perovskite tandem solar cells
  • transparent electrodes

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