Influence of Molybdenum Oxide Interface Solvent Sensitivity on Charge Trapping in Bilayer Cyanine Solar Cells

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• 作者：Sandra Jenatsch ; Roland Hany ; Anna C. V茅ron ; Martin Neukom ; Simon Z眉fle ; Andreas Borgschulte ; Beat Ruhstaller ; Frank N眉esch
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：July 31, 2014
• 年：2014
• 卷：118
• 期：30
• 页码：17036-17045
• 全文大小：456K
• ISSN：1932-7455

文摘

Bilayer organic solar cells based on trimethine cyanine donor and C₆₀ acceptor materials have been fabricated by coating the trimethine dye from solution on molybdenum oxide (MoO₃) anode buffer layer. The choice of deposition solvent drastically influences device performance, with 2,2,3,3-tetrafluoro-1-propanol (TFP) reducing the fill factor and power conversion efficiency of the device by 36 and 21%, respectively, as compared to chlorobenzene. In the case of TFP, extraction of photogenerated charge carriers by linearly increasing voltage (photo-CELIV) and capacitance鈥搗oltage analysis revealed the formation of a hole trapping zone at the molybdenum oxide interface which is also responsible for the S-shape current鈥搗oltage curve under white light irradiation. The transient charge extraction signal originating from trapped holes at the MoO₃ interface could be clearly distinguished from the one relating to hole mobility in cyanine films using photo-CELIV measurements with varying delay times.