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Scalable and efficient perovskite solar cells prepared by grooved roller coating

Xin, Chenguang, Zhou, Xin, Hou, Fuhua, Du, Yawen, Huang, Wei, Shi, Biao, Wei, Changchun, Ding, Yi, Wang, Guangcai, Hou, Guofu, Zhao, Ying, Li, Yuelong, Zhang, Xiaodan
Journal of materials chemistry A 2019 v.7 no.4 pp. 1870-1877
chemistry, coatings, commercialization, photoluminescence, solar cells, solar energy, tin dioxide
Small-area perovskite solar cells (PSCs), prepared by a spin-coating technique have rapidly achieved an excellent power conversion efficiency (PCE) of 23.3% and improved stability. Large-area and efficient PSCs prepared by the scalable deposition technique are urgently required for continuous mass production. Herein, high quality perovskite films and devices have been prepared via a newly developed grooved roller coating (GRC) technique. A critical groove depth of 6 μm has been proven to generate uniform perovskite films with average 594 nm sized grains and a shifted dominant plane from (110) to (224). Time-resolved photoluminescence confirms the balanced interfacial charge transfer (60.8 ns) and bulk transport life time (140.6 ns) for efficient PSCs. GRC-prepared perovskite films demonstrate competitive qualities compared with those prepared by a standard spin-coated (SSC) technique, based on both of which PSC shows a similar PCE of 15.26% for the GRC and 15.76% for the SSC. Finally, the PSCs based on fully roller-coated SnO₂, perovskite and spiro-OMeTAD achieve a PCE of 12.34%, which is the highest PCE value obtainable by the roller coating technique and the first PCE obtained by fully roller coating. Therefore, the results predict that GRC could be a facile and effective method for large-area and continuous mass production of PSCs for future commercialization.