Details

Autor(en) / Beteiligte

• Jinadasa, R. G. Waruna
• Li, Bihong
• Schmitz, Benjamin
• Kumar, Siddhartha
• Hu, Yi
• Kerr, Lei
• Wang, Hong

Titel

Monobenzoporphyrins as Sensitizers for Dye-Sensitized Solar Cells: Observation of Significant Spacer-Group Effect

Ist Teil von

• ChemSusChem, 2016-08, Vol.9 (16), p.2239-2249

Ort / Verlag

Germany: Blackwell Publishing Ltd

Erscheinungsjahr

2016

Quelle

Wiley Online Library - AutoHoldings Journals

Beschreibungen/Notizen

• A series of monobenzoporphyrins (WH1–WH4) bearing different conjugated spacer groups were designed and synthesized as sensitizers for dye‐sensitized solar cells. Although a phenyl spacer only has a minimal impact on the absorption bands of the monobenzoporphyrin, an ethynylphenyl (WH3) or a vinyl (WH4) spacer redshifts and broadens the absorption bands of the dyes to result in much enhanced light‐harvesting ability. Dye‐sensitized solar cells based on these monobenzoporphyrin dyes displayed remarkable differences in power conversion efficiencies (PCEs). The monobenzoporphyrin bearing no spacer (WH1) resulted in a PCE of only 0.5 %; in contrast, the monobenzoporphyrin bearing vinyl spacers (WH4) achieved a PCE of 5.2 %. The high efficiency of the WH4 cell is attributed to the higher light‐harvesting ability, the lesser extent of aggregation on the TiO2 surface, and the more favorable electron‐density distributions of the HOMO and LUMO for electron injection and collection. This work demonstrates the exceptional tunability of benzoporphyrins as sensitizers for dye‐sensitized solar cells. A spacer odyssey: Monobenzoporphyrins bearing conjugated spacer groups are synthesized as sensitizers for dye‐sensitized solar cells. These monobenzoporphyrins demonstrate a significant spacer‐group effect and give power conversion efficiencies in the range 0.5 to 5.2 %.