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The distribution of the inner electric field in organic solar cells studied by electroabsorption spectroscopy

电吸收光谱研究有机太阳能电池内电场分布

基本信息

批准号：
15560008
负责人：
HIROMITSU Ichiro
金额：
$ 0.96万
依托单位：
Shimane University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560008/
关键词：
Solar cells Organic semiconductors Electroabsorption Phthalocyanine Fullerene Perylene Heterojunctions Energy

项目摘要

The correlation between the inner electric field and the photocurrent was studied for the following three types of organic solar cells, in order to find the mechanism of the photocurrent generation.1.Zn-phthalocyanine(ZnPc) Schottky-barrier solar cells2.Zn-phthalocyanine(ZnPc)/Perylene derivative(PTCBI) heterojunction solar cells3.Zn-phthalocyanine(ZnPc)/C_<60> heterojunction solar cellsAn obtained result is that the dissociation of the excitons, or the carrier generation is caused by the inner electric field. Especially, in the cases of the heterojunctions, the inner electric field is the most important driving force for the charge generation, although many researchers believe that the charge generation is caused by the difference in the electron affinities of the two organic semiconductors in a heterojunction. It has also be found that an anomaly, which we call band slipping, occurs at Au/ZnPc interface, which affects the distribution of the inner electric field and the photovoltaic properties.In the case of the ZnPc Schottky-barrier solar cells, the inner electric field obeys the usual theory of depletion layer for the reverse bias condition, but for the forward bias, the inner electric field is quenched by the band slipping between ZnPc and the electrode. In the case of the ZnPc/PTCBI heterojunctions, the inner electric field of the PTCBI layer is independent of the bias voltage and has no correlation with the photocurrent. This inner electric field is not the bulk field in the PTCBI film but is an anomalous field at the interface between PTCBI and In electrode. In the case of ZnPc/C_<60> heterojunctions, the bulk electric field in the C_<60> layer was detected. Both for the ZnPc and C_<60> layers, very good correlation was observed between the inner electric field and the photocurrent, indicating that the carriers are generated by the inner electric filed.

本文对以下三种有机太阳能电池的内部电场与光电流的关系进行了研究，以找出光电流产生的机理。酞菁锌（ZnPc）肖特基势垒太阳能电池。酞菁锌(ZnPc)/苝衍生物（PTCBI）异质结太阳能电池3。zn -酞菁(ZnPc)/C_<60>异质结太阳能电池得到的结果是激子的解离，或载流子的产生是由内部电场引起的。特别是在异质结的情况下，内部电场是电荷产生的最重要的驱动力，尽管许多研究者认为电荷的产生是由异质结中两个有机半导体的电子亲和度的差异引起的。在Au/ZnPc界面处还发现了一种异常现象，我们称之为能带滑移，这种异常现象影响了内部电场的分布和光伏性能。在ZnPc肖特基势垒太阳能电池中，在反向偏压条件下，内部电场服从通常的耗尽层理论，而在正向偏压条件下，内部电场被ZnPc与电极之间的能带滑动淬灭。在ZnPc/PTCBI异质结中，PTCBI层内部电场与偏置电压无关，与光电流无关。该内电场不是PTCBI薄膜中的体场，而是PTCBI与in电极界面处的异常场。在ZnPc/C_<60>异质结的情况下，检测到C_<60>层的体电场。对于ZnPc层和C_<60>层，内层电场与光电流有很好的相关性，表明载流子是由内层电场产生的。