Recombination in Annealed and Nonannealed Polythiophene/Fullerene Solar Cells: Transient Photovoltage Studies versus Numerical Modeling
Recombination in Annealed and Nonannealed Polythiophene/Fullerene Solar Cells: Transient Photovoltage Studies versus Numerical Modeling
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DOI：
10.1021/jz1001506
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发表时间：
2010-05-06
影响因子：
5.7
通讯作者：
Durrant, James R.
中科院分区：
文献类型：
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作者：
Hamilton, Rick;Shuttle, Christopher G.;Durrant, James R.
用瞬态光电压和差分充电法测量了聚合物太阳能电池中的电荷密度和复合速率，发现未退火电池中的电荷动力学比退火电池快一个数量级以上.数值模拟表明，在物理上合理的域的大小和相分离的变化再现的变化中看到的实验结果，从而表明，复合率的测量可以被用来作为一个指标的施主和受主在体异质结太阳能电池的混合程度。通过计算开路和短路条件下的复合通量，我们确定，对于未退火器件观察到的速率常数的增加足以解释器件性能的差异。
Transient photovoltage and differential charging have been used to measure the charge density and recombination rate in polymer solar cells consisting of regioregular poly(3-hexythiophene) (P3HT) blended with 1-(3-methoxy-carbonyl)propyl-1-phenyl-[6,6]-methano fullerene (PCBM) charge dynamics were found to be over an order of magnitude faster in nonannealed cells as compared to annealed cells. Numerical modeling demonstrated that physically reasonable changes in the domain size and phase segregation reproduced the change seen in the experimental results and thus suggest that measurements of recombination rate can be used as an indicator of the degree of intermixing of donor and acceptor in bulk heterojunction solar cells. through calculation of the recombination flux at both open circuit and short circuit conditions, we determine that the increase in rate constant observed for the nonannealed devices is sufficient to explain the differences in device performance.