Dual interfacial modifications of hierarchically structured iodine-doped ZnO photoanodes for high-efficiency dye-sensitized solar cells


Autoria(s): Zheng, Yan-Zhen; Zhao, Jia-Xing; Bi, Shi-Qing; Tao, Xia; Huang, Meilan; Chen, Jian-Feng
Data(s)

01/03/2015

Resumo

A nanocomposite porous electrode structure consisting of hierarchical iodine-doped zinc oxide (I-ZnO) aggregates combined with the two simple solution-processed interfacial modifications i.e. a ZnO compact layer (CL) and a TiO2 protective layer (PL) has been developed in order to understand electron transport and recombination in the photoanode matrix, together with boosting the conversion efficiency of I-ZnO based dye-sensitized solar cells (DSCs). Electrochemical impedance spectra demonstrate that ZnO CL pre-treatment and TiO2 PL post-treatment synergistically reduce charge-transfer resistance and suppress electron recombination. Furthermore, the electron lifetime in two combined modifications of IZnO + CL + PL photoelectrode is the longest in comparison with the other three photoelectrodes. As a consequence, the overall conversion efficiency of I-ZnO + CL + PL DSC is significantly enhanced to 6.79%, with a 36% enhancement compared with unmodified I-ZnO DSC. Moreover, the stability of I-ZnO + CL + PL cell is improved as compared to I-ZnO one. The mechanism of electron transfer and recombination upon the introduction of ZnO CL and TiO2 PL is also proposed in this work.

Identificador

http://pure.qub.ac.uk/portal/en/publications/dual-interfacial-modifications-of-hierarchically-structured-iodinedoped-zno-photoanodes-for-highefficiency-dyesensitized-solar-cells(e436c9e1-8985-40b3-a92c-6be37e60ca4f).html

http://dx.doi.org/10.1016/j.electacta.2015.01.035

Idioma(s)

eng

Direitos

info:eu-repo/semantics/restrictedAccess

Fonte

Zheng , Y-Z , Zhao , J-X , Bi , S-Q , Tao , X , Huang , M & Chen , J-F 2015 , ' Dual interfacial modifications of hierarchically structured iodine-doped ZnO photoanodes for high-efficiency dye-sensitized solar cells ' Electrochimica Acta , vol 157 , pp. 258-265 . DOI: 10.1016/j.electacta.2015.01.035

Tipo

article