A simple engineering strategy with side chain liquid crystal polymers in perovskite absorbers for high efficiency and stability |
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| Institution: | 1. Department of Chemistry Education, Graduate Department of Chemical Materials, Institute for Plastic Information and Energy Materials, Pusan National University, Busan, 46241, Republic of Korea;2. Departmant of Nanoenergry, Pusan National University, Busan, 46241, Republic of Korea;3. Department of Chemistry, The Catholic University of Korea, 43 jibong-ro, Wonmi-gu, Bucheon-si, Gyeonggi-do, 14662, Republic of Korea;4. Advanced Functional Thin Films Department Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Changwon, Gyeongnam, 51508, Republic of Korea;5. Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan;1. Department of Chemistry Education, Graduate Department of Chemical Materials, Institute for Plastic Information and Energy Materials, Sustainable Utilization of Photovoltaic Energy Research Center (ERC), Pusan National University, Busan 46241, Republic of Korea;2. Beamline Division, Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 37673 Republic of Korea;3. Materials Center for Energy Convergence, Surface Technology Division, Korea Institute of Materials Science (KIMS), Gyeongnam 51508, Republic of Korea |
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| Abstract: | Accomplishing a superior perovskite layer with better morphology, enhanced efficiency, and improved stability is one of the great challenges to researchers. In present work, we incorporated various side chain liquid crystal polymers (SCLCP) as dopants into the perovskite precursor to attain high efficiency and long-term stability of the perovskite solar cells (PSCs). Incorporation of SCLCP increases the grain size of the crystalline perovskite film by controlled solvent evaporation, decreased the grain boundaries and reduced charge recombination, which decelerates the material degradation. With the SCLCP doping, the PSC power conversion efficiency was expressively enhanced from 17.8% (non-doped) to 19.01% for the doped perovskite film with much improved stability. Furthermore, the atomic force microscopy measurements showed a better surface roughness for doped film by effective passivation of the perovskite grain surfaces. Field emission scanning electron microscope also showed better morphology with reduced grain boundaries. Especially, the SCLCP act as bridge between the crystal grains for efficient charge transfer from perovskite layer towards the electrode, which would moderately illustrate the increased efficiency and stability. |
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| Keywords: | Perovskite solar cells Side chain liquid crystal Hysteresis-less Dopant Stability |
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