Exciton diffusion and dissociation in a poly(p-phenylenevinylene)/C-60 heterojunction photovoltaic cell
Exciton diffusion and dissociation in a poly(p-phenylenevinylene)/C-60 heterojunction photovoltaic cell
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DOI：
10.1063/1.115797
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发表时间：
1996-05-27
影响因子：
4
通讯作者：
Holmes, AB
中科院分区：
文献类型：
--
作者：
Halls, JJM;Pichler, K;Holmes, AB
我们报告了两层光电池的光伏响应的测量结果，该光电池由共轭聚合物聚苯乙烯撑（PPV）和富勒烯（C-60）层形成，在氧化铟锡和铝电极之间形成。在短路条件下测得峰值量子效率高达 9%（每个入射光子收集的电子）。我们对 PPV 层中光生激子产生的光伏响应进行建模，这些激子能够扩散到与 C-60 层的界面，在那里它们被电离。我们从光谱响应和绝对效率中获得了 7+/-1 nm 的激子扩散范围值。我们证明，从吸收光子产生单线态激子的分支比接近于一。 (C) 1996 年美国物理研究所。
We report measurements of the photovoltaic response of two-layer photocells formed with layers of the conjugated polymer poly(phenylenevinylene), PPV and fullerene, C-60, formed between indium-tin oxide and aluminum electrodes. Peak quantum efficiencies of up to similar to 9% (electrons collected per incident photon) were measured under short-circuit conditions. We model the photovoltaic response as arising from excitons photogenerated in the PPV layer which are able to diffuse to the interface with the C-60 layer where they are ionized. We obtain a value for the exciton diffusion range of 7+/-1 nm, both from the spectral response and from the absolute efficiency. We demonstrate that the branching ratio for the creation of singlet excitons from absorbed photons is close to unity. (C) 1996 American Institute of Physics.