Details

Autor(en) / Beteiligte

• Chang, Yuan Jay
• Chou, Po-Ting
• Lin, Szu-Yu
• Watanabe, Motonori
• Liu, Zhi-Qian
• Lin, Ju-Ling
• Chen, Kew-Yu
• Sun, Shih-Sheng
• Liu, Ching-Yang
• Chow, Tahsin J.

Titel

High-Performance Organic Materials for Dye-Sensitized Solar Cells: Triarylene-Linked Dyads with a 4-tert-Butylphenylamine Donor

Ist Teil von

• Chemistry, an Asian journal, 2012-03, Vol.7 (3), p.572-581

Ort / Verlag

Weinheim: WILEY-VCH Verlag

Erscheinungsjahr

2012

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• A series of organic dyes were prepared that displayed remarkable solar‐to‐energy conversion efficiencies in dye‐sensitized solar cells (DSSCs). These dyes are composed of a 4‐tert‐butylphenylamine donor group (D), a cyanoacrylic‐acid acceptor group (A), and a phenylene‐thiophene‐phenylene (PSP) spacer group, forming a D‐π‐A system. A dye containing a bulky tert‐butylphenylene‐substituted carbazole (CB) donor group showed the highest performance, with an overall conversion efficiency of 6.70 %. The performance of the device was correlated to the structural features of the donor groups; that is, the presence of a tert‐butyl group can not only enhance the electron‐donating ability of the donor, but can also suppress intermolecular aggregation. A typical device made with the CB‐PSP dye afforded a maximum photon‐to‐current conversion efficiency (IPCE) of 80 % in the region 400–480 nm, a short‐circuit photocurrent density Jsc=14.63 mA cm−2, an open‐circuit photovoltage Voc=0.685 V, and a fill factor FF=0.67. When chenodeoxycholic acid (CDCA) was used as a co‐absorbent, the open‐circuit voltage of CB‐PSP was elevated significantly, yet the overall performance decreased by 16–18 %. This result indicated that the presence of 4‐tert‐butylphenyl substituents can effectively inhibit self‐aggregation, even without CDCA. Quite materialistic: The dye CB‐PSP exhibited Jsc (14.63 mA cm−2), Voc (0.685 V), and FF values (0.67), which corresponded to a conversion efficiency of 6.70 %. The overall performance was reduced by about 16–18 % with addition of chenodeoxycholic acid (CDCA). This result indicated that the presence of tert‐butylphenyl substituents can effectively inhibit self‐aggregation, even without CDCA.