Journal
JOURNAL OF APPLIED PHYSICS
Volume 115, Issue 15, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4871466
Keywords
-
Categories
Funding
- National Science Foundation [ECCS-1102011, ECCS-0644945]
- Sustainable Energy Education and Research Center and Center for Materials Processing at the University of Tennessee
- Center for Nanophase Materials Sciences [CNMS2012-106, CNMS2012-107, CNMS-2012-108]
- Oak Ridge National Laboratory by the Division of Scientific User Facilities, U.S. Department of Energy
- National Science Foundation of China [21161160445, 61077020]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1438181] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1102011] Funding Source: National Science Foundation
- Office Of The Director
- EPSCoR [1004083] Funding Source: National Science Foundation
Ask authors/readers for more resources
This paper reports the experimental studies on the effects of dielectric thin-film on surface-charge accumulation and collection by using capacitance-voltage (C-V) measurements under photoexcitation. The dielectric thin-films with different surface polarizations are used with inverted device architecture based on the common photovoltaic PTB7:PC71BM film. In the C-V measurements, the peak-voltage shift with light intensity, namely, V-peak shift, is particularly used to determine the surface-charge accumulation. We find that the V-peak shows a smaller shift with light intensity when a higher surface polarization of dielectric thin-film is used. This means that a higher surface polarization of dielectric thin-film can decrease the surface-charge accumulation at electrode interface. However, a lower surface polarization of dielectric thin-film leads to a larger shift with light intensity. This implies that a lower surface polarization of dielectric thin-film corresponds to a larger surface-charge accumulation. This experimental finding indicates that dielectric thin-film plays an important role in the surface-charge accumulation and collection in the generation of photocurrent in organic solar cells. We demonstrate that the device performance can reach the power conversion efficiency of 8.7% when a higher dielectric PFN is used to enhance the surface-charge collection based on the inverted design of ITO/PFN/PTB7:PC71BM/MoO3/Ag. (C) 2014 AIP Publishing LLC.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available