期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 16, 期 10, 页码 4971-4976出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp54908a
关键词
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资金
- NSF [ECCS-0644945, ECCS-1102011]
- Center for Nanophase Materials Sciences [CNMS2012-106, CNMS2012-107]
- Oak Ridge National Laboratory by the Division of Scientific User Facilities
- U.S. Department of Energy
- International Cooperation and Exchange Program [21161160445]
- National Natural Science Foundation of China [61077020]
- National Significant Program (Quantum Control) [2013CB922104]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1102011] Funding Source: National Science Foundation
- EPSCoR
- Office Of The Director [1004083] Funding Source: National Science Foundation
The accumulation of dissociated charge carriers plays an important role in reducing the loss occurring in organic solar cells. We find from light-assisted capacitance measurements that the charge accumulation inevitably occurred at the electrode and photovoltaic layer interface for bulk-heterojunction ITO/PEDOT: PSS/P3HT: PCBM/Ca/Al solar cells. Our results indicate, for the first time through impedance measurements, that the charge accumulation exists at the anode side of the device, and more importantly, we successfully identify the type of charge accumulated. Further study shows that the charge accumulation can significantly affect open circuit voltage and short circuit current. As a result, our experimental results from light assisted capacitance measurements provide a new understanding of the loss in open-circuit voltage and short-circuit photocurrent based on charge accumulation. Clearly, controlling charge accumulation presents a new mechanism to improve the photovoltaic performance of organic solar cells.
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