Journal
CHEMSUSCHEM
Volume 9, Issue 18, Pages 2578-2585Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201600905
Keywords
dopant-free; hole-transport material; perovskite; solar cells; stability
Funding
- Key Projects in Natural Science Foundation of Tianjin [16JCZDJC37100]
- China Scholarship Council
- King Abdulaziz City for Science and Technology (KACST)
- Swiss National Science Foundation (SNSF)
- NRP 70 Energy Turnaround
- CCEM-CH
- European Union's Horizon 2020 research and innovation programme [687008]
- SNF-NanoTera and Swiss Federal Office of Energy (SYNERGY)
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Three novel hole-transporting materials (HTMs) using the 4-methoxytriphenylamine (MeOTPA) core were designed and synthesized. The energy levels of the HTMs were tuned to match the perovskite energy levels by introducing symmetrical electron-donating groups linked with olefinic bonds as the bridge. The methylammonium lead triiodide (MAPbI(3)) perovskite solar cells based on the new HTM Z34 (see main text for structure) exhibited a remarkable overall power conversion efficiency (PCE) of 16.1% without any dopants or additives, which is comparable to 16.7% obtained by a p-doped 2,2,7,7-tetrakis-(N,N-di-4-methoxyphenylamino)-9,9-spirobifluorene (spiro-OMeTAD)-based device fabricated under the same conditions. Importantly, the devices based on the three new HTMs show relatively improved stability compared to devices based on spiro-OMeTAD when aged under ambient air containing 30% relative humidity in the dark.
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