Breakthrough in Perovskite Solar Cell Technology Extended Lifespan and Higher Efficiency
TapTechNews August 2nd news, a research team from Beijing Institute of Technology proposed a simple and universal nucleation engineering strategy, significantly improving the quality of the wide-bandgap perovskite light-absorbing layer, greatly extending the service life of tandem solar cells, and the relevant results were published in Science.
Perovskite/silicon tandem solar cells not only combine the excellent photoelectric properties of perovskite materials, but also can give play to the technical advantages of China's crystalline silicon photovoltaic industry. It is a research hotspot in the field of renewable energy and also one of the important supporting technologies for China to achieve the carbon neutrality goal.
The research team proposed a simple and universal nucleation engineering strategy, by simply adding long-chain alkylamines, such as oleylamine iodine, in the precursor solution to form a single 3C-phase dominant nucleus with a uniform component distribution, greatly suppressing the generation of other non-ideal nuclei. At the same time, combined with the vacuum pumping thin film deposition technology to reduce the influence of the local environment during the growth process of the nucleus, thus preparing a high-crystallinity and highly concentrated crystal plane orientation high-quality wide-bandgap perovskite film.
The team prepared a wide-bandgap perovskite film and a perovskite/silicon tandem solar cell with lower non-radiative recombination loss. Devices based on an active area of 1 square centimeter and 25 square centimeters achieved photoelectric conversion efficiencies of 32.5% (32.0% evaluated by a third party) and 29.4% (28.9% evaluated by a third party), respectively.
At the same time, these films also show better photothermal stability. After 200 hours of photoaging, the PL wavelength drift of the film is significantly suppressed. After 85°C thermal aging for 831 hours, the XRD signal of the film remains the same as the initial state, and the crystal quality remains good.
The packaged perovskite/silicon tandem solar cell, under standard light conditions, after tracking for 1301 hours and 800 hours at 25°C and 50°C respectively, maintained 98.3% and 90% of the initial efficiency, compared with the unoptimized sample, has a longer operating life.
In addition, the device also shows the possibility of application in extreme environments such as near space. After 56 hours of operation of the packaged device under full-spectrum illumination, 245K, and 5kPa low pressure, it still retains 90.4% of the initial efficiency.
TapTechNews attached the paper link: https://www.science.org/doi/10.1126/science.ado9104