Role of polyethylene glycol addition on the improvement of P3HT:PCBM organic solar cells
Role of polyethylene glycol addition on the improvement of P3HT:PCBM organic solar cells
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DOI：
10.1007/s10854-018-00606-0
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发表时间：
2019-01
期刊：
影响因子：
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通讯作者：
T. Soga;S. Kato;S. Kato;N. Kishi
中科院分区：
文献类型：
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作者：
T. Soga;S. Kato;S. Kato;N. Kishi
在本工作中，通过在P3HT和PCBM共混物的溶液中添加PEG（聚乙二醇）来提高体异质结有机太阳能电池的功率转换效率（PCE）。加入分子量为300的PEG后，短路电流和填充因子增大，而开路电压不变。另一方面，通过添加分子量为6000的PEG，PCE变得更差。通过场发射扫描电子显微镜观察到，在旋涂期间通过相分离在有源层下形成附加层。通过引入PEG层也提高了太阳能电池的稳定性。这些结果通过在P3HT：PCBM活性层下形成PEG界面层来解释，该界面层充当空穴传输层并且还阻止水从PEDOT：PSS向金属电极扩散。
In this work, the power conversion efficiency (PCE) of bulk heterojunction organic solar cell is improved by adding PEG (polyethylene glycol) in the solution of P3HT and PCBM blend. The short circuit current and fill factor are increased by adding PEG with the molecular weight of 300, whereas the open circuit voltage is not changed. On the other hand, PCE becomes worse by adding PEG with the molecular weight of 6000. It was observed by field-emission scanning electron microscopy that the additional layer was formed under the active layer during spin coating by phase separation. The stability of solar cell is also improved with introducing the PEG layer. These results were explained by the formation of the PEG interfacial layer under the P3HT:PCBM active layer, which acts as a hole transport layer and also blocks the water diffusion from PEDOT:PSS toward the metal electrode.