Fabrication And The Performance Study Of Inverted Perovskite Solar Cells

The organic-inorganic hybrid perovskite solar cell is an important topic in research area of energy conversion during the past few years.In order to solve the energy and environmental problems,solar energy has received worldwide attention as a potential inexhaustible source.Since 2009,perovskite solar cells have developed rapidly,due to the low cost,simple fabrication process,and high efficiency.The power conversion efficiency of perovskite solar cells has increased from 3.8%to 22.7%in less than a decade.The inverted perovskite solar cell(p-i-n)has proven to be of the virtues of higher stability and fill factor and lower hysteresis effect than the normal perovskite solar cell(n-i-p).However,there are still enormous challenges in improving the inverted perovskite solar cell due to its humidity sensibility.In this dissertation,we focus our study on the fabrication process in the condition of ambient air environment,the purpose of which is to increase both the photoelectric conversion efficiency and lifetime.For effectively extracting photo generated holes,we investigated several approaches of fabricating NiO hole transport layers.Meanwhile,we improve the balance of electron and hole diffusion in the corresponding electron-and hole-extracting layer by adjusting their thickness.We took use of the vacuum flash method to quickly extract the organic solvent from the spin-coated precursor film for improving the quality of perovskite light absorbing layer.This method provided high reproducibility in fabricating the highly efficient perovskite solar cells with the narrow distribution,overcoming the inherited shortcomings of the anti-solvent method.At the same time we explored several different precursor solutions in order to achieve a more efficient and stable perovskite layer.Our group spent two years to study inverted perovskite solar cells and also achieved a photoelectric conversion efficiency of 13.1%.