Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
Semitransparent perovskite solar cells for building-integrated photovoltaics (BIPV) require top electrodes that combine high visible transmittance with low sheet resistance. Oxide/metal/oxide (OMO) electrodes are attractive because they can be deposited at room temperature and the Ag layer reflects near-infrared (NIR) light. However, Ag grows as islands on oxide surfaces[2]; below the minimum continuous-film (percolation) thickness, absorption and scattering increase and sheet resistance rises sharply. Sputtered IZO is reported to remain amorphous while its oxygen-vacancy and carrier concentrations vary with oxygen flow[1], yet its effect on Ag film formation is unexplored. We therefore studied IZO/Ag/IZO electrodes whose bottom IZO (40 nm) was deposited at oxygen flow ratios of 0–0.18%, with Ag varied from 6 to 12 nm. First, the Ag thickness dependence was examined. Thinner Ag lowered visible transmittance (average 58.2% at 6 nm), consistent with island growth, discontinuous films, and scattering, implying reduced conductivity. At 12 nm, visible transmittance reached 73.0% (400–700 nm, substrate included) while transmittance at 1100 nm fell from about 36% to about 19%. This combination is expected to provide the transparency BIPV requires while blocking internal infrared, mitigating heat-induced degradation.
This work was supported by "Contract-Based Graduate Enrollment Quotas Program" of Korea Industrial Technology Association(KOITA) funded by Ministry of Science and ICT (MSIT).
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