Journal
ACS ENERGY LETTERS
Volume 2, Issue 5, Pages 1029-1034Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.7b00054
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Funding
- Austrian Research Promotion Agency-FFG [5730587]
- Italian MIUR for project MAAT (Molecular NAnotechnology for HeAlth and EnvironmenT) [PON02_00563_3316357 - CUP B31C12001230005]
- Regione Puglia [LSBC6N4, GOWMB21]
- ARTI [LSBC6N4, GOWMB21]
- Swiss National Science Foundation [Program NRP70] [153990]
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Phenothiazine-based compounds, PTZ1 and PTZ2, were synthesized through straightforward Buchwald-Hartwig and Suzuki-Miyaura cross-couplings, respectively, by binding the suitable donor groups (diarylamine or triarylamine) to a phenothiazine core. Phenothiazine-based structures were proven for the first time as hole transporting materials in solution-processed lead trihalide perovskite-based solar cells. A dramatic effect exerted by the presence of phenylene spacers was observed on the relevant photovoltaic performances. The power conversion efficiencies measured under AM1.5 sun increase from 2.1% (PTZ1) to a remarkable 17.6% (PTZ2), a value rivaling those obtained with the state-of-the-art Spiro-OMeTAD (17.7%). These results indicate phenothiazine-based compounds as promising candidates to be used as readily available and cost-effective hole-transporting materials in perovskite solar cells.
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