Journal
ADVANCED ENERGY MATERIALS
Volume 9, Issue 36, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201901719
Keywords
cold antisolvent bathing; highly oriented crystals; large area perovskite solar cells; retarded nucleation and growth
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Funding
- National Research Foundation (NRF) of Korea grant - Ministry of Science and ICT [2012R1A3A2026417]
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Scaling large-area solar cells is in high demand for the commercialization of perovskite solar cells (PSCs) with a high power-conversion efficiency (PCE). However, few roll-to-roll-compatible deposition methods for the formation of highly oriented uniform perovskite films are reported. Herein, a facile cold antisolvent bathing approach compatible with large-area fabrication is introduced. The wet precursor films are submerged in a cold antisolvent bath at 0 degrees C, and the retarded nucleation and growth kinetics allow highly oriented perovskite to be grown along the [110] and [220] directions, perpendicular to the substrate. The high degree of the preferred crystal orientation benefits the effective charge extraction and reduces the amount of inter- and intra-grain defects inside the perovskite films, improving the PCE from 16.48% (ambient-bathed solar cell) to 18.50% (cold-bathed counterpart). The cold antisolvent bathing method is employed for the fabrication of large-area (8 x 10 cm(2)) PSCs with uniform photovoltaic device parameters, thereby verifying the scale-up capability of the method.
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