Efficient dye regeneration in solid-state dye-sensitized solar cells fabricated with melt processed hole conductors

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• 作者：Mindaugas Juozapavicius^a ; Brian C. O&rsquo ; Regan^a ; ^{b.oregan@imperial.ac.uk} ; Assaf Y. Anderson^a ; Juozas V. Grazulevicius^b ; Viktorija Mimaite^b
• 关键词：Dye-sensitized solar cell ; Melt-processable ; Organic hole transporting material ; Transient absorption spectroscopy
• 刊名：Organic Electronics
• 出版年：2012
• 出版时间：January 2012
• 年：2012
• 卷：13
• 期：1
• 页码：23-30
• 全文大小：758 K

文摘

A new method for melting hole transporting materials (HTM) into mesoporous TiO₂ electrodes to obtain solid-state dye-sensitized solar cells (DSSC) is reported. Internal coverage is determined from the efficiency of hole conductor oxidation by photo-oxidized dyes (dye regeneration), measured using transient absorption spectroscopy. High efficiency regeneration indicates complete coverage of the electrode internal surface. A high work function hole conductor (>5.2 eV) was found to give shorter regeneration lifetimes (<1 ¦Ìs) and better regeneration efficiencies (>90 % ) than expected. Cell photocurrents were low, but improved after iodine vapor doping of the hole conductor. Counter intuitively, doping also reduced the recombination rate constant 7-fold. A solid state solar cell with power conversion efficiency of 0.075 % at 1 sun is reported.