Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 15, Issue 9, Pages 7040-7044Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2015.10513
Keywords
Bulk Heterojunction Solar Cells; Morphology; Kelvin Probe Force Microscopy; Surface Potential; Charge Extraction; Photo-CELIV
Categories
Funding
- NSF EPSCoR [0903804]
- NSF MRI [1229577]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1229577] Funding Source: National Science Foundation
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In this work role of solvent additive namely 1,8 diiodoctane (DIO) on the nanoscale morphology and its relation with the charge transport of poly(diketopyrrolopyrrole-terthiophene) (PDPP3T):PCBM solar cells has been investigated. Addition of DIO led to enhanced structural ordering as observed from optical measurements. Photovoltaic devices processed with DIO additive showed improved efficiencies due to significant enhancement in short circuit current density. Atomic force microscopy (AFM) and Kelvin probe force microscopy (KPFM) images showed that DIO led to finer phase segregation that gave rise to better photovoltaic performance in additive processed active layers. Photoinduced current extraction by linearly increasing voltage (P-CELIV) measurements on PDPP3T:PCBM solar cells revealed higher mobility and extracted charge carrier density for DIO processed devices.
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