[1] [1] Ting H K, Lu N, Ma S B, et al. Progress in electron-transport materials in application of perovskite solar cells[J].Acta Physica Sinica,2015,64(3):38802-038802.

[3] [3] Liu J, Zhang J, Yue G, et al. W-doped TiO2 Photoanode for high performance perovskite solar cell[J].Electrochimica Acta,2016,195:143-149.

[4] [4] Liu D, Li S, Zhang P, et al. Efficient planar heterojunction perovskite solar cells with li-doped compact TiO2layer[J].Nano Energy,2017,31:462-468.

[5] [5] Qin P, Domanski A L, Chandiran A K, et al. Yttrium-substituted nanocrystalline tio2 photoanodes for perovskite based heterojunction solar cells.[J].Nanoscale,2014,6(3):1508-1514.

[6] [6] Thambidurai M, Kim J, Song H J, et al. Enhanced Power conversion efficiency of inverted organic solar cells by using solution processed Sn-doped TiO2 as an electron transport layer[J].Journal of Materials Chemistry A,2014,2(29):11426-11431.

[12] [12] Segall M D, Lindan P J D, Probert M J,et al. First-principles simulation:ideas, illustrations and the castep code[J].Journal of Physics:Condensed Matter,2002,14(11):2717-2744.

[13] [13] Burdett J K, Hughbanks T, Miller G J, et al. ChemInform abstract:structural-electronic relationships in inorganic solids:powder neutron diffraction studies of the rutile and anatase polymorphs of titanium dioxide at 15 and 295 K[J].ChemInform,1987,18(37):3639-3646.

[14] [14] Zhao X Z. Calculation of cation radius[J].Acta chemical,1980(3):11-16.

[15] [15] Czoska A M, Livraghi S, Chiesa M, et al. The nature of defects in fluorine-doped TiO2[J].Journal of Physical Chemistry C,2008,112(24):8951-8956.