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Summer Research Fellowship Programme of India's Science Academies

Wettability and Conductivity enhancement of PEDOT:PSS in Organic Solar Cell

Kousumi Mukherjee

B.E. Chemical Engineering, Birla Institute of Technology, Mesra, Ranchi 835215

Dr Ashok Kumar Dasmahapatra

Associate Professor, Department of Chemical Engineering, Indian Institute of Technology, Guwahati, Assam 781039

ABSTRACT

Solar energy is a renewable source of energy and with the increasing global demand for energy, it can help to decrease the stress on fossil fuels. Instead of the conventional crystalline Silicon based solar cells, organic solar cells (OSC) can be used as they are cheaper, thin, transparent, flexible and lightweight. PEDOT:PSS (poly (3,4-ethylenedioxythiophene) polystyrene sulfonate) is used as the hole acceptor in an OSC because of its conducting nature, transparency, thermal stability and good film forming properties. In order to enhance its efficiency, a solvent can be added to increase its wettability on the substrate and conductivity. So, different solvents like glycerol, ethylene glycol and DMF (dimethylformamide) were added to the base PEDOT:PSS (50 volume% dilute). Film properties such as wettability, conductivity and thickness of film were found out by varying the process parameters such as the solution concentration ratios and spin coating speed. Gold nanoparticles are then added into the solvents to find out its effect on the conductivity. This study will help understand one of the main causes of low-efficiency of OSC or the wettability of PEDOT:PSS by trying to make a better contact between the anode layer and the hole-collector component i.e. PEDOT:PSS and also thereby increasing its conductivity.

Keywords: OSC, Organic solar cells, PEDOT:PSS, wettability, conductivity, gold nanoparticles, glycerol, ethylene glycol, dimethyl formamide

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