On May 30th, the academic journal "Advanced, Materials" published by Wiley Publishing Co., Ltd. published the latest research results of Dr. Qin Pingli, a young teacher at the Institute of Optoelectronic Information and Energy Engineering and the School of Mathematical Sciences at Wuhan Polytechnic University, on a perovskite photovoltaic device. "Stable and Efficient Organo-metal Halide Hybrid Perovskite Solar Cells via π-Conjugated Lewis base Polymer Induced Trap-Passivation and Charge-Extraction. Dr. Qin Pingli, the first author of the paper, was invited to attend the 5th New Solar Cell Academic Symposium hosted by the Institute of Physics of the Chinese Academy of Sciences on May 26-27 and was invited to give a report.
Advanced Materials is a leading journal in the field of materials science (including materials chemistry, materials physics, biomaterials, nanomaterials, optoelectronic materials, metallic materials, inorganic non-metallic materials, electronic materials and other related research fields). The current journal has an impact factor of close to 20.
In 2009, the perovskite was first reported as a photoactive layer for solar cells, and the energy conversion efficiency (PCE) of the corresponding battery was increased from 3.8% to the current 22.7%. At present, the stability of the battery is the biggest bottleneck in commercialization, especially the impact on moisture. Polymer organic semiconductors have good charge transport properties, easy film formation, and hydrophobic properties, and are expected to be applied to perovskite batteries to promote the commercialization of batteries. In this paper, the anti-solvent method was used to introduce a very small amount of polymer PBDB-T (this molecule is also a star molecule in current non-fullerene organic polymer solar cells) in the perovskite photosensitive layer film. Device efficiency from 17.28 % increases to a maximum of 19.85%.
At the same time, the highly hydrophobic PBDB-T effectively improves the stability of the corresponding battery. Non-encapsulated perovskite cells can maintain initial efficiencies of over 90% at 3600 hours/~5 months at room temperature with dry air storage. The lifetime of the unpackaged battery T70 increased by -300% at room temperature (~70% relative humidity) at 85°C. It is worth noting that the attenuation caused by strong light is much more severe than 85°C heating. The authors conducted a study of the effects of LED sunlight on the performance of photovoltaic cells at a solar intensity of 0.8. Irrespective of the initial rapid efficiency degradation, the lifetime of the T40 device was substantially increased from about 6 hours to 270 hours for the comparison device, an increase of about 45 times.
Dr. Qin Pingli graduated from Wuhan University in 2012. In the same year, he tracked the development of photovoltaics at the postdoctoral station of physics at Wuhan University. In 2017, he went to the Hong Kong Polytechnic University's Li Gang Group for a one-year visit. The publication of this paper marks the college’s new achievements in personnel training, discipline development and scientific research.
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