A Step Toward Efficient Panchromatic Multi-Chromophoric Sensitizers for Dye Sensitized Solar Cells

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• 作者：Fadi M. Jradi ; Daniel O鈥橬eil ; Xiongwu Kang ; Jinsze Wong ; Paul Szymanski ; Timothy C. Parker ; Harry L. Anderson ; Mostafa A. El-Sayed ; Seth R. Marder
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：September 22, 2015
• 年：2015
• 卷：27
• 期：18
• 页码：6305-6313
• 全文大小：504K
• ISSN：1520-5002

文摘

Panchromatic dyes with absorption profiles extending into the near-infrared are of interest to researchers in the field of dye sensitized solar cells (DSSCs), as they offer potential access to a wide energy range of photons necessary to enhance solar to electric power conversion efficiencies (PCEs). In this report, a porphyrin with a Soret band absorbing at high energy is combined with a squaraine absorbing at low energy via an acetylene linker to form a bichromophoric sensitizer with molar extinctions on the order of 10⁵ M^鈥? cm^鈥? and an incident photon-to-current efficiency (IPCE) onset of 鈭?50 nm. Various bulky substituents were installed on both the porphyrin and squaraine moieties, and conjugation was increased with 蟺-bridge spacers to achieve a PCE of 7.6%, which is up to 15% higher than a comparable squaraine-only dye. For the most part, charge injection dynamics indicate slower charge injection rates and lower injection quantum yields for these bichromophoric sensitizers compared to nonporphyrin squaraine-based DSSC sensitizers. Nevertheless, higher PCE was observed for most porphyrin-containing dyes due largely to increased panchromaticity.