341. Introduction Solar power is a key technology for achieving carbon neutrality due to its cost-effectiveness and maturity. In urban areas like Japan, limited land availability has driven interest in installing photovoltaics on building facades and windows. These applications require design flexibility and architectural compatibility. Perovskite solar cells (PSCs), with their high efficiency and customizable form factors, are promising for building-integrated photovoltaics (BIPV). While lab-scale PSCs rival crystalline silicon in performance, challenges remain in scaling, reliability, and integration with building materials. This paper outlines our development efforts for practical BIPV-compatible PSC modules.2. Scaling-Up Technology PSC modules face efficiency losses when scaled up due to the sensitivity of thin (<1 μm) polycrystalline layers to thickness and crystallinity. Uniform control across large areas is essential. We adopted inkjet printing for its precision and adaptability to various glass substrates, achieving 18.1% efficiency on a 30 cm-square module (active area: 804 cm²). In FY2024, we began operating a line for 1.0 m × 1.8 m substrates to enhance large-area performance. This scalable approach also supports flexible production for customized module sizes.3. Semi-Transparency for Window Applications To enable window integration and support Net Zero Energy Buildings (ZEBs), we control transparency using laser-processed slit patterns. It also enables design customization, creating new value beyond conventional solar modules. By balancing transparency and energy output, our technology supports both functional and aesthetic requirements in modern architecture.4. Conclusion Commercializing PSCs requires not only technical development but also reliable manufacturing and system-level integration. For BIPV, balancing solar and building material functions is essential. Our approach addresses key challenges such as scalability, transparency control, and architectural compatibility. We aim to refine these technologies and accelerate the deployment of perovskite-based BIPV systems, contributing to carbon-neutral cities.Yukihiro Kaneko, Ph.D.Head of Perovskite Photovoltaics Business Promotion Office, Panasonic Holdings CorporationDevelopment of Building Integrated Perovskite Photovoltaic GlassDr. Kaneko was born in Hokkaido in 1980. He received his B.S. degree in engineering from Nagoya University, Japan, in 2003, and his M.S. degree in engineering from the same university in 2005. He obtained his Ph.D. degree in electronics and applied physics from the Tokyo Institute of Technology, Japan, in 2012.In 2005, he joined Matsushita Electric Industrial Co., Ltd. (now Panasonic Holdings Corporation), where he has been engaged in the development of materials and devices. In 2015, he was assigned as an on-site manager at imec in Belgium. After returning to Japan in 2019, he took on the role of manager of the Perovskite PV team. He has held his current position since 2021. Invited Talk 6
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