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首页> 外文会议>Symposium on Organic and Polymeric Materials and Devices―Optical, Electrical and Optoelectronic Properties Apr 1-5, 2002 San Francisco, California, U.S.A. >Open-Circuit Voltage Characteristics in Polyfluorene Based Photovoltaic Devices
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Open-Circuit Voltage Characteristics in Polyfluorene Based Photovoltaic Devices

机译：基于聚芴的光伏器件的开路电压特性

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摘要

In this work the origin of the open-circuit voltage is studied in bi-layer devices based on polyfluorenes. The devices were fabricated using a lamination technique, which avoids the problems that usually arise when making well-defined bi-layers from soluble polymers. Often the open-circuit voltage in devices is attributed to the difference in the workfunctions of the electrodes. Whilst a cathode dependence of the open-circuit voltage was observed here, an additional constant voltage of ～1 V was also present in the devices investigated. We conclude that this additional open-circuit voltage is largely a result of a photo-induced dipole at the donor-acceptor interface. This dipole is formed by charges that are separated as a result of exciton dissociation when the device is illuminated. Devices where the order of the polymer layers was reversed showed very different open-circuit voltages which confirms that the open-circuit voltage is heavily dependent on the structure of the active layer in the device. The effects of device thickness and excitation intensity on open-circuit voltage are also discussed.
机译：在这项工作中，在基于聚芴的双层器件中研究了开路电压的起源。器件是使用层压技术制造的，这种技术可以避免在用可溶性聚合物制作清晰的双层膜时通常出现的问题。设备中的开路电压通常归因于电极功函数的差异。虽然在这里观察到阴极对开路电压的依赖性，但在研究的器件中还存在〜1 V的附加恒定电压。我们得出的结论是，这种额外的开路电压主要是由于施主-受主界面处的光诱导偶极子引起的。该偶极子由照明时由于激子解离而分离的电荷形成。聚合物层顺序颠倒的器件显示出截然不同的开路电压，这证实了开路电压在很大程度上取决于器件中有源层的结构。还讨论了器件厚度和激励强度对开路电压的影响。

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