Abstract：Porous SnO2 photoanodes coated by alumina through atomic layer deposition technology are reported. It is found that when the dosing time of precursor is extended over 11 s, the 125% maximum increase of cell efficiency is achieved. It is believed that besides the interfacial charge recombination being efficiently suppressed by this ultra-thin coating, the increased absorption of dyes and elimination of the high density of monoenergetic surface states on SnO2 might play a positive role in improving the cell efficiency. The reason is that a long exposure time of precursor can guarantee the 100% coverage of alumina on porous SnO2, which is further explained by a built three-step model. Then we conclude that for a high cell efficiency in porous photoelectrode a long exposure time is indispensable.
. [J]. 中国物理快报, 2014, 31(09): 98401-098401.
DONG Wan, WANG Zheng-Duo, YANG Li-Zhen, MENG Tao, CHEN Qiang. Insights of Unconventionally Long Exposure Time in Atomic Layer Deposition Al2O3 to Modify SnO2 Photoanode of Dye-Sensitized Solar Cells. Chin. Phys. Lett., 2014, 31(09): 98401-098401.
2014, Vol. 31 
