Journal
DYES AND PIGMENTS
Volume 136, Issue -, Pages 273-277Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2016.08.002
Keywords
Triphenylamine; Hole transport material; Dopant-free; Perovskite; Solar cell
Funding
- China Scholarship Council
- Key Projects in Natural Science Foundation of Tianjin [16JCZDJC37100]
- King Abdulaziz City for Science and Technology (KACST)
- Swiss National Science Foundation (SNSF)
- NRP 70 Energy Turnaround
- SNF-NanoTera
- Swiss Federal Office of Energy (SYNERGY)
- CCEM-CH in the 9th call proposal 906: CONNECT PV
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Two star-shaped TPA-based small-molecule materials (Z1012 and Z1013) were designed and synthesized in this paper. These molecules show high hole mobility and suitable energy levels for CH3NH3PbI3-based perovskite solar cells. Photovoltaic cells based on the Z1013 without any dopants or additives achieve an excellent power conversion efficiency (PCE) of 15.4%, which is comparable to devices based on state-of art p-doped spiro-OMeTAD. Moreover, the devices based on these two HTM5 show much better stability than that of devices based on spiro-OMeTAD when aging in ambient air both at room temperature and 80 degrees C. These results demonstrate that star-shape TPA5 could be excellent dopant-free HTM5 for perovskite solar cells and hold promise to replace the p-doped spiro-OMeTAD, which is important for the fabrication of cost-effective and stable devices. (C) 2016 Published by Elsevier Ltd.
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