Premium
Role of Modifying Photoanodes by Organic Titanium on Charge Collection Efficiency Enhancement in Dye‐Sensitized Solar Cells
Author(s) -
Cao Dapeng,
Yin Huiming,
Yu Xiaohui,
Zhang Jingbo,
Jiao Yunfei,
Zheng Wei,
Mi Baoxiu,
Gao Zhiqiang
Publication year - 2020
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201901071
Subject(s) - dye sensitized solar cell , materials science , dielectric spectroscopy , anatase , electrophoretic deposition , mesoporous material , chemical engineering , electrolyte , energy conversion efficiency , substrate (aquarium) , open circuit voltage , scanning electron microscope , layer (electronics) , nanotechnology , titanium , titanium dioxide , electrochemistry , electrode , optoelectronics , photocatalysis , composite material , coating , catalysis , voltage , chemistry , organic chemistry , metallurgy , oceanography , engineering , quantum mechanics , physics , geology
Mesoporous TiO 2 photoanodes are prepared by an electrophoretic deposition (EPD) method and applied in dye‐sensitized solar cells (DSSCs). Pretreating an F‐doped SnO 2 coated glass (FTO) substrate and post‐treating a TiO 2 film to introduce an anatase TiO 2 layer on the FTO and the TiO 2 film, respectively, can greatly improve the power conversion efficiency (PCE) of a DSSC, which constitutes up 31% improvement compared with the untreated device. To disclose the mechanism for improvement, scanning electron microscopy, electrochemical impedance spectroscopy, open‐circuit voltage decay, and photoluminescence spectra are investigated. It is proposed that the preformed compact TiO 2 layer can suppress the back recombination by preventing direct contact between the electrolyte and the FTO substrate. Moreover, the compact TiO 2 layer can reduce contact resistance between FTO and TiO 2 particles. Further increased PCE by post‐treatment is attributed to the promoted charge transfer efficiency. Both pre‐ and post‐treating strategies can offer a reference to enhance the PCE for other porous film‐based DSSCs, as well as promote the application of EPD in DSSCs.