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We have exploited a green approach to prepare layered titanate Na2- xHxTi2O5·H2O nanosheet arrays on FTO substrate by hydrothermal hydrolysis of titanium(IV) isopropoxide(TTIP) with aids of Na2 EDTA and TEOA as co-coordination agents, which were then treated by HNO3 to replace Na+by H+, followed by a calcination at 450 ℃ to topotactically transform into anatase Ti O2 nanosheet arrays. SEM, TEM, XRD, and Raman spectroscopy have been employed to characterize the nanosheet films. The Ti O2 nanosheet arrays were further applied as electron transport materials of CH3NH3 Pb I3perovskite solar cells, achieving power conversion efficiency of 6.99%.
We have exploited a green approach to prepare layered titanate Na2-xHxTi2O5 · H2O nanosheet arrays on FTO substrate by hydrothermal hydrolysis of titanium (IV) isopropoxide (TTIP) with aids of Na2 EDTA and TEOA as co-coordination agents, which were then treated by HNO3 to replace Na + by H +, followed by a calcination at 450 ° C to topotactically transform into anatase Ti O2 nanosheet arrays. SEM, TEM, XRD, and Raman spectroscopy have been employed to characterize the nanosheet films. The Ti O2 nanosheet arrays were further applied as electron transport materials of CH3NH3 Pb I3perovskite solar cells, achieving power conversion efficiency of 6.99%.