Simultaneous Transient Absorption and Transient Electrical Measurements on Operating Dye-Sensitized Solar Cells: Elucidating the Intermediates in Iodide Oxidation
Simultaneous Transient Absorption and Transient Electrical Measurements on Operating Dye-Sensitized Solar Cells: Elucidating the Intermediates in Iodide Oxidation
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DOI：
10.1021/jp910221j
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发表时间：
2010-02-04
影响因子：
3.7
通讯作者：
O'Regan, Brian C.
中科院分区：
文献类型：
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作者：
Anderson, Assaf Y.;Barnes, Piers R. F.;O'Regan, Brian C.
同时采集的瞬时吸收、光电流和光电压信号被用来表征在1个太阳光照度下运行的染料敏化太阳能电池(DSC)。在开路时，光伏和980 nm吸收的两相衰减具有相同的衰减曲线。数据表明，在以N719[(Bu4N)(2)[Ru(DcbpyH)(2)(NCS)(2)](dcbpy=4，4‘-二羧基-2，2’-联吡啶)为增敏剂的器件中，950-1020 nm的吸收峰可单独归属于电子。这与以前的一些作业不同。在短路时，积分光电流瞬变、电子吸收和氧化染料的吸收(830 Nm)的比较可以用来显示氧化染料的相对光电流损失。此外，我们表明，在操作条件下，没有证据表明存在长寿命的二碘自由基(I-2(中心点-))。此外，我们还证明了560 nm处的瞬时漂白剂的衰变，以前分配给基态染料的漂白剂，包含额外的与电子瞬变相关的长寿命漂白剂成分。这使得使用漂白剂瞬变来研究染料再生的动力学受到了质疑。同时使用瞬变吸收和电信号显著增加了从瞬变吸收研究中可获得的信息，而几乎不需要额外的时间或设备成本。
Simultaneously acquired transient absorption, photocurrent, and photovoltage signals are used to characterize operational dye-sensitized solar cells (DSSCs) under 1 sun illumination. At open circuit, the biphasic decay of both photovoltage and 980 nm absorption have identical decay profiles. The data show that, in devices incorporating N719 [(Bu4N)(2)[Ru(dcbpyH)(2)(NCS)(2)] (dcbpy = 4,4'-dicarboxy-2,2'-bipyridyl) as the sensitizer, the 950-1020 nm absorption can be assigned to electrons alone. This differs from some previous assignments. At short circuit, the comparison of the integrated photocurrent transient, electron absorption, and the absorption of the oxidized dye (830 nm) can be used to show relative loss of photocurrent to oxidized dyes. In addition, we show that, tinder operational conditions, there is no evidence for long-lived di-iodine radicals (I-2(center dot-)) Further, we show that the decay of the transient bleach at 560 nm, previously assigned to the bleach of the ground-state dye, contains additional long-lived bleach components that correlate with the electron transient. This calls into question the use of the bleach transients for kinetic studies of dye regeneration. The use of simultaneous transient absorption and electrical signals significantly increases the information available from transient absorption studies, at little extra cost in time or equipment.