The Effect of conductive Hole Transporting Film on the Performance of Polymer Solar Cells
Paper ID : 1371-MST2015-FULL
sholeh kazemifard *1, leila naji2, faramarz afshar taromi3, zahra teymouri4, sahar mahmodi5
1Amirkabir university of technology
2amirkabir university of technology
3Amirkabir University of Technology (Tehran Polytechnic)
4AmirKabir University of Technology
5amirkabir university of tehran
Recently, investigations show that among the renewable resources of energy, the sun is the best energy source due to its high capacity, durability and availability. To obtain energy from sun, Solar cells which convert solar energy to electricity have been developed. Among different types of solar cells, polymer solar cells (PSCs) according to their specific properties have been attracted scientists. Each PSC is composed of different conductive layers which are sandwiched between two electrodes. These layers are consist of ITO (indium tin oxide) as anode, hole transporting layer (HTL such as PEDOT: PSS), active layer, electron transporting layer (ETL) and finally cathode. Modification on each layer has an important effect on the solar cell performance.
In this work, the effect of hole transporting film conductivity (poly (3, 4-ethylenedioxythiophene) polystyrene sulfonate or PEDOT: PSS) on the performance of polymer solar cell is considered. Hole transporting layer could block electron movement to anode and led to balance work function of anode and internal electrical field of the solar cell. To achieve the highest conductivity of PEDOT: PSS film, HTL coating on ITO has been carried out by spin coater in various spin rate (2500, 3500 and 4500 rpm). Also the effect of solvents (H2O, Ethanol and Methanol) to remove excess amount of PSS from the surface of HTL film to increase conductivity were reported. Then, annealing (80, 100 and 120 °С) was performed on the specimens to smooth HTL film. After all treatments on the conductive HTL film to improving electrical properties of this film, solar cell performance was investigated by potentiostat. According to the results 3500 rpm and 120 °С were the best coating condition for HTL film on ITO. After solar cell performance characterization, 1% increase in power conversion efficiency has been obtained after treatment of HTL membrane.
Polymer Solar Cell, Hole Transporting Layer, PEDOT: PSS, Power Conversion Efficiency, Conductive Film
Status : Paper Accepted (Oral Presentation)