Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP27)
Publication date: 22nd October 2026
Semi-transparent solar cells have emerged as a key technology for building-integrated photovoltaics (BIPV)—particularly in tandem devices—requiring a delicate balance between power conversion efficiency (PCE) and visible light transmittance (VLT). Among the various architectures, tandem configurations based on hydrogenated amorphous silicon (\(a\text{-Si:H}\)) represent a promising option, thanks to the ability to tune their bandgap and their excellent absorption properties. However, the overall performance of these tandem structures depends heavily on the effectiveness of the intermediate recombination layer (IRL), which must ensure efficient charge-carrier recombination while minimizing optical losses.
In this work, we design and investigate a new low-loss intermediate recombination layer based on a three-layer VOx/AZO/a-Si:H(n) structure, integrated into semi-transparent (a-Si:H) tandem solar cells. Vanadium oxide (VOx) acts as an efficient hole-selective layer, while aluminum-doped zinc oxide (AZO) provides excellent electrical conductivity and optical transparency. Combined with a thin electron-collecting a-Si:H(n) layer, this specifically engineered junction facilitates an efficient tunneling-based recombination mechanism between the top and bottom subcells.
The optoelectronic properties of the VOx/AZO/a-Si:H(n) structure were systematically optimized to minimize series resistance and suppress parasitic absorption in the green-to-blue spectral range. By precisely tuning the thickness and deposition parameters of each layer, the developed semi-transparent tandem devices exhibited a significant reduction in voltage losses at the intermediate junction. As a result, the optimized devices achieved a notable power conversion efficiency of 3.6%, while maintaining an average visible transmittance (AVT) of 15.3%.
These results demonstrate that the VOx/AZO/a-Si:H(n) configuration offers a robust and highly scalable strategy for enhancing the electrical performance of semi-transparent tandem solar cells without compromising their optical transparency. This opens new avenues for the development of highly efficient, building-integrated solar energy harvesting technologies.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.