Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Publication date: 7th November 2016
Perovskite solar cells with their simple solution processed fabrication, high efficiency and tunable bandgap are very promising to combine with silicon solar cells in a tandem configuration. For this type of tandem, perovskite active material with a bandgap of 1.7 – 1.8 eV is optimal. However, it is challenging to achieve a good performance for perovskites in this bandgap range due to high energetic disorder and low charge carrier mobility. Combined with the stringent requirement for the semi-transparent perovskite top cell to have very low sub-bandgap absorption, this has limited the achievable perovskite/silicon tandem efficiency. Here we explore rubidium (Rb) as an alternative cation to use in a novel multi-cation method with the formamidinium (FA)/methylammonium (MA)/cesium (Cs) system to obtain 1.75 eV bangap perovskite cells with negligible hysteresis and steady state efficiency of more than 17%. Our study shows the beneficial effect of Rb in improving the crystallinity and suppressing defects in the perovskite material. In parallel, we developed a sputtered indium doped tin oxide thin film to be used as a transparent contact with absorption of less than 5% in the long wavelength region. Using these two developments, we fabricated semi-transparent perovskite cells with efficiency of up to 14.8% and average transparency of more than 80% (peak at ~84%) between 720 nm and 1100 nm. In a tandem configuration using a 23.9% silicon cell, we demonstrated 24.7% efficiency (9.9% from silicon cell) in a mechanically stacked tandem configuration. We identify a clear pathway to break the single junction silicon cell record of 26.33% in the future.
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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.