Hot Excitons Increase the Donor/Acceptor Charge Transfer Yield
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- 作者：Michael Schulze ; Marc H盲nsel ; Petra Tegeder
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：December 11, 2014
- 年：2014
- 卷：118
- 期：49
- 页码：28527-28534
- 全文大小：402K
- ISSN：1932-7455
文摘
Understanding the photoinduced ultrafast charge transfer (CT) dynamics across the donor/acceptor interface is a prerequisite for optimizing the performance of organic photovoltaic devices. Time-resolved second harmonic generation, an interface-sensitive probe with femtosecond temporal resolution, is applied to investigate the well-defined single heterojunction C60/P3HT. The de-excitation of hot singlet excitons in the conduction bands of the polymer into localized excitonic states is observed. In the presence of the electron acceptor, the ultrafast population of a CT state is identified as the dominating relaxation channel. Interestingly, the charge transfer yield correlates with the excitation wavelength and rises with increasing excess energy.