In:
ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2018-03, No. 4 ( 2018-07-13), p. 209-209
Abstract:
Herein, a novel approach to generate Al-doped ZnO nanotubes (AZO NTs) via simultaneous doping and etching of H 2 O-oxidized ZnO nanorods (NRs) is presented. The simultaneous doping and etching was done through a facile one-step spin-coating process of a methanolic AlCl 3 solution on top of the NRs. The acidic nature of the AlCl 3 solution triggers the selective etching of polar (001) planes of ZnO resulting in the formation of NTs. At the same time, doping with Al occurs. Surface morphological analysis revealed the gradual transformation of the NRs to full NTs with increasing number of AlCl 3 coatings. Improved transmittance and a blue shift in absorption edge can also be observed in doped films indicating band gap broadening. Evidence of dopant inclusion in AZO NTs was verified in XPS measurements. XRD and Raman spectra displayed a shift in 2 θ values and reduced E 2 peaks for the AZO NTs, respectively. These results also demonstrate the successful incorporation of Al 3+ ions in ZnO crystals. In addition, room temperature photoluminescence showed that all the samples exhibited blue ( l = 450 nm) and orange emissions (( l = 650 nm); however, the intensity of the latter emission is reduced and a new green emission (( l = 530 nm) appeared with the increase in Al concentration. Moreover, the AZO NTs exhibited higher electrical conductivity and electron mobility values compared with undoped ZnO NRs. These improved electrical properties, as well as, the higher surface area of AZO NTs could substantially enhance the photovoltaic performance of perovskite solar cells through effective electron extraction and suppression of carrier recombination. Finally, we are now aiming to utilize these films as electron-transporting layer for perovskite solar cells. Figure 1
Type of Medium:
Online Resource
ISSN:
2151-2043
DOI:
10.1149/MA2018-03/4/209
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2018
detail.hit.zdb_id:
2438749-6
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