Enhanced Photovoltaic Performance with Carbon Nanotubes Incorporating into Hole Transport Materials for Perovskite Solar Cells
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In an attempt to further enhance the photovoltaic performance of perovskite solar cells (PSCs) fabricated by spray deposition under ambient conditions, carbon nanotubes (CNTs) are introduced for incorporation into hole transport materials (HTM). The effect of CNT category and length on the efficiency of the perovskite solar cell for incorporation into HTM is investigated. The enhanced photovoltaic performance is achieved in multi-walled carbon nanotubes (MWCNTs) with the shortest length. The efficiency of acid-treated MWCNT-based cells is improved compared to that of purified MWCNTs due to the better dispersibility and the π–π interaction between the –COOH group and spiro-OMeTAD. As the volume ratio of the spiro-OMeTAD and spiro/MWCNTs mixture is 2:2 or 3:1, the highest power conversion efficiency (PCE) of PSCs containing MWCNTs reaches 8.7% with the enhanced short-circuit current density (J sc) and open-circuit voltage (V oc).
KeywordsCarbon nanotubes perovskite solar cells hole transport materials photovoltaic performance
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This work was supported by the Collaborative Innovation and Environmental Construction Platform of Guangdong Province (2014A050503051), Open Fund of Jiangsu Key Laboratory of Materials and Technology for Energy Conversion (MTEC-2015M01), and the Natural Science Foundation of Guangdong Province (2015A030310501).
- 15.J.X. Wang, Z.N. Bi, Z.R. Liang, and X.Q. Xu, Acta Phys. Sin. 65, 058801 (2016).Google Scholar