skip to main content

SciTech ConnectSciTech Connect

Title: Solvent polarity and nanoscale morphology in bulk heterojunction organic solar cells: A case study

Organic bulk heterojunction solar cells were fabricated under identical experimental conditions, except by varying the solvent polarity used for spin coating the active layer components and their performance was evaluated systematically. Results showed that presence of nitrobenzene-chlorobenzene composition governs the morphology of active layer formed, which is due to the tuning of solvent polarity as well as the resulting solubility of the P3HT:PCBM blend. Trace amount of nitrobenzene favoured the formation of better organised P3HT domains, as evident from conductive AFM, tapping mode AFM and surface, and cross-sectional SEM analysis. The higher interfacial surface area thus generated produced cells with high efficiency. But, an increase in the nitrobenzene composition leads to a decrease in cell performance, which is due to the formation of an active layer with larger size polymer domain networks with poor charge separation possibility.
Authors:
 [1] ;  [2] ; ;  [1] ; ; ; ;  [3] ;  [4]
  1. Centre for Nano-Bio-Polymer Science and Technology, Department of Physics, St. Thomas College, Pala, Kerala 686574 (India)
  2. (India)
  3. Department of Materials Engineering, Indian Institute of Science Bangalore, Karnataka 560012 (India)
  4. Department of Chemistry, SVR NSS College Vazhoor, Kerala 686505 (India)
Publication Date:
OSTI Identifier:
22277918
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ATOMIC FORCE MICROSCOPY; ENERGY EFFICIENCY; HETEROJUNCTIONS; INTERFACES; MORPHOLOGY; NANOSTRUCTURES; NITROBENZENE; ORGANIC POLYMERS; ORGANIC SOLAR CELLS; PERFORMANCE; SCANNING ELECTRON MICROSCOPY; SOLVENTS; SPIN-ON COATING; SURFACE AREA; SURFACES