Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
Publication date: 27th October 2017
Perovskite solar cells have attracted great attention recently due to their high power conversion efficiency with low cost despite their short history. Several fabrication methods have been proposed to lead to high performances. Dripping anti-solvents to perovskite precursors in DMF:DMSO mixed solvents is one of the promising method, resulting in high quality perovskite films. DMSO in DMF has strong bonding by lewis base and acid interaction with MAI and PbI2, so called intermediate states, which decelerate fast crystallization of perovskites. Dripping anti-solvents such as chlorobenzene and ethyl ether accelerate crystallization of perovskites by super-saturation. Thus, for high-quality perovskite films, adequate control of crystallization kinetic is significantly important. Here, we present the relationship between the evaporation kinetics of intermediate states and performances for mixed cation perovskite solar cells. By putting the petri-dish on the perovskite substrates right after spin-coating with different temperatures for certain time (stage 1) and further annealing without petri-dish for 1h at 100 celsius (stage 2), evaporation kinetics of intermediate states can be easily controlled. The mirror-like color, which is indicative of intermediate states, is kept for several seconds or minutes depending on the annealing temperature with petri-dish at stage 1. From the measurement of AFM and SEM, the grain sizes and the surface roughness are largely affected by evaporization kinetics of intermediate states. Photoluminescence (PL) measurement also reveals that adequate control of evaporation kinetics of intermediate states enhances the PL intensity, indicating that non-radiative recombination is suppressed, which leads to high power conversion efficiency recording 21% for quadrupole cation perovskite solar cells.
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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
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