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Four-terminal (4-T) tandem solar cells ( e . g ., perovskite/CuInSe 2 (CIS)) rely on three transparent conductive oxide electrodes with high mobility and low free carrier absorption in the near-infrared (NIR) region. In this work, a reproducible In 2 O 3 :H (IO:H) film deposition process is developed by independently controlling H 2 and O 2 gas flows during magnetron sputtering, yielding a high mobility value up to 129 cm 2 V -1 s -1 in highly crystallized IO:H films annealed at 230 °C. Optimization of H 2 and O 2 partial pressures further decreases the crystallization temperature to 130 °C. By using a highly crystallized IO:H film as the front electrode in NIR-transparent perovskite solar cell (PSC), a 17.3% steady-state power conversion efficiency and an 82% average transmittance between 820 and 1300 nm are achieved. In combination with an 18.1% CIS solar cell, a 24.6% perovskite/CIS tandem device in 4-T configuration is demonstrated. Optical analysis suggests that an amorphous IO:H film (without postannealing) and a partially crystallized IO:H film (postannealed at 150 °C), when used as a rear electrode in a NIR-transparent PSC and a front electrode in a CIS solar cell, respectively, can outperform the widely used indium-doped zinc oxide (IZO) electrodes, leading to a 1.38 mA/cm 2 short-circuit current ( J  sc ) gain in the bottom CIS cell of 4-T tandems.

High-Mobility In2O3:H Electrodes for Four-Terminal Perovskite/CuInSe2 Tandem Solar Cells

High-Mobility In₂O₃:H Electrodes for Four-Terminal Perovskite/CuInSe₂ Tandem Solar Cells