Solvent Effects of a Dimethyldicyanoquinonediimine Buffer Layer as N-type Material on the Performance of Organic Photovoltaic Cells

초록

In the present work, we have fabricated organic photovoltaic cells consisting of ITO/PEDOT: PSS/P3HT:PCBM/DMDCNQI/Al using a dip-coating method with various solvent systems. We have investigated solvent effects (such as solubility, viscosity and vapor pressure) in deposition of a thin DMDCNQI buffer layer on the performance of organic photovoltaic cells. The solvent system which had low viscosity and good solubility properties, made a dense and uniform DMDCNQI ultra thin film, resulting in a high performance device. In particular, a prepared organic photovoltaic cell was fabricated using a cosolvent system (methanol: methylenechloride = 3: 1) and showed a maximum power conversion efficiency of 4.53%.

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