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Carbon Nanotubes in TiO 2 Nanofiber Photoelectrodes for High-Performance Perovskite Solar Cells

Batmunkh, M; Macdonald, TJ; Shearer, CJ; Bat-Erdene, M; Wang, Y; Biggs, MJ; Parkin, IP; ... Shapter, JG; + view all (2017) Carbon Nanotubes in TiO 2 Nanofiber Photoelectrodes for High-Performance Perovskite Solar Cells. Advanced Science , 4 (4) , Article 1600504. 10.1002/advs.201600504. Green open access

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Abstract

1D semiconducting oxides are unique structures that have been widely used for photovoltaic (PV) devices due to their capability to provide a direct pathway for charge transport. In addition, carbon nanotubes (CNTs) have played multifunctional roles in a range of PV cells because of their fascinating properties. Herein, the influence of CNTs on the PV performance of 1D titanium dioxide nanofiber (TiO2 NF) photoelectrode perovskite solar cells (PSCs) is systematically explored. Among the different types of CNTs, single-walled CNTs (SWCNTs) incorporated in the TiO2 NF photoelectrode PSCs show a significant enhancement (≈40%) in the power conversion efficiency (PCE) as compared to control cells. SWCNTs incorporated in TiO2 NFs provide a fast electron transfer within the photoelectrode, resulting in an increase in the short-circuit current (J sc) value. On the basis of our theoretical calculations, the improved open-circuit voltage (V oc) of the cells can be attributed to a shift in energy level of the photoelectrodes after the introduction of SWCNTs. Furthermore, it is found that the incorporation of SWCNTs into TiO2 NFs reduces the hysteresis effect and improves the stability of the PSC devices. In this study, the best performing PSC device constructed with SWCNT structures achieves a PCE of 14.03%.

Type: Article
Title: Carbon Nanotubes in TiO 2 Nanofiber Photoelectrodes for High-Performance Perovskite Solar Cells
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/advs.201600504
Publisher version: http://dx.doi.org/10.1002/advs.201600504
Additional information: © 2017 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1556399
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