Critique of charge collection efficiencies calculated through small perturbation measurements of dye sensitized solar cells
Critique of charge collection efficiencies calculated through small perturbation measurements of dye sensitized solar cells
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DOI：
10.1063/1.4789966
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发表时间：
2013-02
影响因子：
3.2
通讯作者：
V. Sivaram;J. Kirkpatrick;H. Snaith
中科院分区：
文献类型：
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作者：
V. Sivaram;J. Kirkpatrick;H. Snaith
通过实验和模拟，我们批判性地考察了提取染料敏化太阳能电池（DSSCs）电荷收集效率ηc的传统方法。我们证明，通过测量短路时的瞬态衰减率提取的收集效率随着ηc的减小而大大偏离真实值。这种差异源于两个误差来源：首先，瞬态电压衰减率对短路附近的扰动大小特别敏感；其次，衰减率受测量过程中捕获电荷和自由电荷之间的瞬态平衡的影响。只有当收集效率很高（大约90%）时，真实值和测量值才会很好地吻合。这一发现最终阐明了稳态和瞬态收集效率测量之间的差异；前者对低ηc的器件更准确，后者对高ηc的器件更准确。我们首次提出了一个完全无维的DSSC模型，允许我们…
Through experiment and simulation, we critically examine the conventional method of extracting the charge collection efficiency, ηc, of dye-sensitized solar cells (DSSCs). We demonstrate that the collection efficiency extracted by measuring transient decay rates at short circuit deviates considerably from the true value as ηc decreases. This discrepancy arises from two sources of error: first, transient voltage decay rates are especially sensitive to perturbation size near short circuit, and second, the decay rates are influenced by transient equilibration between trapped and free charge during the measurement. Only if the collection efficiency is high (>90%) do the true and measured values coincide well. This finding finally elucidates the disparity between steady-state and transient measurements of the collection efficiency; the former is more accurate for devices with a low ηc, and the latter for devices with a high ηc. For the first time, we present a fully nondimensional model of the DSSC, allowing u...