Photoinduced Injection Enhancement in Fullerene-Based Organic Solar Cell Originates from Exciton鈥揈lectron Interaction

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• 作者：Wenbin Li ; Haomiao Yu ; Jiawei Zhang ; Yao Yao ; Changqin Wu ; Xiaoyuan Hou
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：June 5, 2014
• 年：2014
• 卷：118
• 期：22
• 页码：11928-11934
• 全文大小：303K
• 年卷期：v.118,no.22(June 5, 2014)
• ISSN：1932-7455

文摘

The dependence of photocurrent of a typical copper phthalocyanine (CuPc)/C₆₀ device on external negative bias under monochromatic light illumination is reported. With increase of the negative bias, the photocurrent originating from excitons in the CuPc layer is quickly saturated. On the contrary, the photocurrent originating from excitons in C₆₀ layer does not reach saturation but increases continuously with negative bias. This abnormal enhancement shows that the behavior of excitons in C₆₀ layer is completely different from that in the typical donor material CuPc. The triplet exciton鈥揺lectron interaction in C₆₀ is supposed to cause the photoinduced hole injection enhancement from cathode, resulting in the observed phenomenon. More experiments designed have confirmed this mechanism.